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VARIABILITY OF THE INHIBITORS OF SERINE, CYSTEINE PROTEINASES AND INSECT AMYLASES IN VIGNA AND PHASEOLUS 1 2 3 AL.V.KONAREV , N.TOMOOKA , M. ISHIMOTO , AND 2 DUNCAN A.VAUGHAN 1 All-Russian Institute of Plant Protection Podbelskogo 3, St. Petersburg, 189620, Russia; [email protected] 2 National Institute of Agrobiological Resources 2-1-2, Kannondai, Tsukuba, Ibaraki 305-8602, Japan 3 National Institute of Agro-Environmental Sciences, 3-1-3, Kannondai, Tsukuba, Ibaraki 305, Japan 1. Introduction Proteinase and -amylase inhibitors are factors involved with plant resistance to insects and microorganisms [2, 7, 21, 27]. Many inhibitors in legumes, cereals and other plants are well studied biochemically and genetically [5, 27]. Our research focuses on the study of natural inhibitor variability in plants. Spectra of inhibitors provide biochemical and genetic information. In wheat, levels of amylase and proteinase inhibitory activity in seeds are related to the spectra of inhibitors [17, 21]. Combination of various inhibitor systems cause synergistic effects increasing plant resistance to pests [25] or to pathogens [1]. Proteinase inhibitors theoretically can protect amylase inhibitors from destruction by gut proteinases and preserve them as anti-nutritional factors. Inhibitors can also be useful as genetic markers in the study of plant diversity and evolution [12, 16, 18, 20, 21] in combination with conventional methods [9, 11, 22], in particular, for elucidation the origin of resistant plant forms. Consequently, parallel analysis of variability of all main inhibitor systems in species and genera can be highly informative. The objectives of the present work were to study proteinase and -amylase inhibitor polymorphism in Vigna and Phaseolus and estimate the variation in inhibitors in both genera. 2 AL.V.KONAREV et al. Although inhibitors in both these economically important genera are well studied, inhibitor variation in diverse germplasm, especally, in Vigna species, is still unclear. In addition, taxonomy of both genera is imperfectly understood [23, 24, 29]. The methods used here are based on a set of methods for inhibitor identification which have been efficient in studies of inhibitors in wheat and related cereals [16, 15, 18]. Analysis of digestive enzymes of several Coleoptera and Hemiptera insect species in relation to inhibitors from cereals revealed amylases, trypsin-like , chymotrypsin-like and cystein proteinases [13, 15, 17, 18]. Results from wheat studies confirm the validity of conducting most of our research on inhibitor variability using standard enzymes, such as bovine trypsin. In case of legumes we worked with insect amylases and did not work with insect proteinases, but is known that many legume pests have cysteine and serine digestive proteinases [7, 10]. 2. Materials and Methods Inhibitor variability was studied in 93 accessions of 24 species in the 6 subgenera of Vigna and 55 accessions of 14 Phaseolus species collected by authors or obtained from MAFF, Japan and USDA, USA gene banks (TABLE 1). Species names and taxonomy were used according to Marechal et al. (1978) and Tomooka et al. (1996) [24, 29]. Seed and leaf proteins were extracted with 20 % glycerin (1:10 and 1:2 correspondingly) and were separated by isoelectric focusing in Servalyt precotes gels (Serva) pH 3-10. Proteinase inhibitors were detected by gelatin replicas method [14, 15]. -Amylase inhibitors were detected by starch/amylase/PAG replicas [13, 19]. 3. Variability in Hydrolase Inhibitors. 3.1. PROTEINASE INHIBITORS IN SEEDS Trypsin-like enzymes are common in guts of many insect species and in extracellular liquids of some fungi. Inhibitors of trypsin-like enzymes are the most active and complex inhibitor system in legumes studied and they are of Bowman-Birk type [6]. Variability of seed trypsin inhibitors (TI) was studied in accessions of six subgenera of Vigna and in the genus Phaseolus (arranged according to taxonomy [24] in Fig. 1). Not all, but majority of TI components in VARIABILITY OF THE INHIBITORS 3 Vigna and in Phaseolus species were active to chymotrypsin as well (not shown). This is characteristic of Bowman-Birk type inhibitors. Vigna subgenus Vigna species (Fig. 1: 2 & 3, V. luteola; 4, V. marina; 5&6, V. oblongifolia; 7, V. membranacea and, 9-11, V. unguiculata) had, in general, species specific TI spectra. V. oblongifolia and V. unguiculata were polymorphic by inhibitor spectra. Some bands were common for two or three species (for example, bands with high pI in patterns 2, 6 and 10). For most V. vexillata accessions (12-14, subgenus Plectotropis) TI bands possessed pI below 5,3. Some results, perhaps reflected species misidentification in analyzed accessions. For example, sample 13 called V. vexillata had TI spectra similar to V. oblongifolia (6) and has been now been reidentified as this species. Main types of spectra found in Vigna subgenus Ceratotropis are shown (Fig. 1). We found that the majority of Ceratotropis species examined had species specific spectra for TI and chymotrypsin inhibitors (CI). In addition, considerable intraspecific variability was detected for trypsin inhibitors in most species, for example, V. angularis (16-19 in Fig. 1), V. hirtella complex (24-27) and V. radiata (33-35). TI and CI in seeds of some V. hirtella accessions (g & h) were not detected (27). However, intraspecific variability for inhibitors was very low in, for example, V. minima and V. mungo. Most species in the subgenus Ceratotropis are diploid except for two closely related tetraploids V. reflexo-pilosa subsp. glabra and V. reflexo-pilosa subsp. reflexo-pilosa, which are considered to be amphidiploids [3]. Both tetraploid species are resistant to bruchid beetles [28] and diseases [4], thus the origin of their genomes, which has not been clearly established, is of particular interest to plant breeders. TI of diploid V. trinervia (30) were closer to those of the tetraploids V. reflexo-pilosa subsp. reflexo-pilosa (31) and subsp. glabra (32) than other species. This result corresponds to data on izoenzymes [3]. Several TI and CI bands in tetraploid species were similar to inhibitors of accessions “a” and “b” (Table 1) with unclear taxonomy included to V. hirtella complex. It is possible that forms related to these accessions and V. trinervia were donors of the genomes in the allotetraploid species [14]. TI spectrum of V. lasiocarpa (45) differed significantly from that of V. longifolia (46) (subgenus Lasiocarpa). V. caracalla accessions 47 and 48 (subgenus Sigmoidotropis) had only two similar TI bands. Three single seeds of the accession “a” of V. adenantha (49-51) differed strongly by TI (Fig.1), morphology and color. Two TI components of seed 49 were similar to those of V. caracalla (48). In seeds 50 and 52 (b) TI bands were very faint. 4 AL.V.KONAREV et al. Figure 1. Variability of trypsin inhibitors in Vigna and Phaseolus species. Seed proteins extracted with water were separated in Servalyt precotes pH 3-10 gel and trypsin inhibitors were detected by gelatin replicas method. V-M, subgenera Vigna. a,b,... designation of accessions listed in TABLE 1. V, s/g Vigna: 20-22, V. umbellata (a-c) 40-41,V. aconitifolia (a&b) Phaseolus : 72, P. leptostachyus (a) 2, 3& 63, V. luteola (a&b) 23, V. minima (c) 42&43, V. stipulacea (a&b) 56-59 &79-81, P. vulgaris (f-h, 73, P. maculatus 4, V. marina 24-27, V. hirtella (b, c , e&h) L, s/g Lasiocarpa: q, a&c ) 74, P. microcarpus (a) 5&6, V. oblongifolia (a&b) 28, V. nepalensis (b) 45, V. lasiocarpa 60-61& 64-65, P. acutifolius (f, g, 75, P. parvulus 7, V. membranacea;, 8, 30, V. trinervia 46, V. longifolia a&d) 76, P. polystachios (a) 9-11, V. unguiculata (a-c) 31, V. reflexo-pilosa (a) S, s/g Sigmoidotropis 66, P. angustissimus (a) 77, P. ritensis (a) P, s/g Plectotropis: 32, V. glabrescens (a) 47&48, V. caracalla (a&b) 67, P. coccineus (a) 78, P. stenolobus (a) 12-14, V. vexillata (a, b&i) 33-35, V. radiata (a, c&h ) 49-51 & 52, V. adenantha (a&b) 68, P. filiformis (a) “*”, marker mixture of samples C, s/g Ceratotropis: 36-37, V. mungo (a&d) H, s/g Haydonia: 69, P. glabellus (b) 10 and 21 16-19, V. angularis (a-d) 38-39, V. grandiflora (a&b) 53, V. schimperi 71, P. hybrid (b) VARIABILITY OF THE INHIBITORS 5 High intra-accession variability for TI may be a result of outcrossing. We did not find any relationship between the TI of V. schimperi (53) (subgenus Haydonia) and TI of other Vigna representatives. Most Phaseolus species possessed distinctive TI spectra, though some of them showed intraspecific variability. Some P. vulgaris lines (56-59) varied by TI. P. acutifolius accessions (60, 61, 64 and 65) differed by TI spectra as well. Some TI bands had similar pI in two or more species (for example, P. acutifolius, 65, and P. angustissimus, 66; P. coccineus, 67, P. glabellus, 69, and P. hybrid, 71). ). In the genus Phaseolus the same TI variants occur in several species which enables relationships between inhibitor systems within Phaseolus to be analysed. As to relationship between TI systems of Vigna and Phaseolus, there are some similarities in structure of TI spectra of representatives of Vigna subgenus Lasiocarpa (V. caracalla, acc. 47) , and P. vulgaris (57, 79). Both Vigna subgenus Lasiocarpa and Phaseolus are of America [24] which may explain their seemingly close evolutionary relationship based on TI spectra. Subtilisin inhibitors (SI) are possible plant protective factors to fungi, because subtilisin-like extracellular proteinases are common for many plant pathogens. SI spectra are less complex and less variable than those of TI (not shown). Spectra of SI were specific for species and groups of species within subgenus Ceratotropis [14], other subgenera of Vigna and for Phaseolus species. Some species had polymorphic SI. Cysteine proteinase inhibitors (CPI) are poorly studied in Vigna compared to other inhibitors. Cysteine proteinases are very important in protein digestion of bruchid beetles which are a major pests of Vigna and Phaseolus. In this work we used the plant cysteine proteinase papain for detection of inhibitors. Papain inhibitors generally showed variation at the species level in both Vigna and Phaseolus. Though all Ceratotropis species had species specific spectra of TI and other inhibitors, the majority of inhibitor components were common for two or more species. Combined data inhibitor bands in all accessions were scored (present or absent) in order to estimate evolutionary relationships between species (74 band positions were taken into account) [14]. It was much more difficult to find common TI components between species of Ceratotropis and other Vigna subgenera. Only in V. vexillata (s/g Plectotropis) some TI bands were similar to inhibitors of V. hirtella accessions “a” and “b” and both tetraploid species. The results of evaluation of evolutionary relationships between Ceratotropis species are shown (Fig. 2) (data 6 AL.V.KONAREV et al. on all analysed inhibitor systems: TI, CI, SI and CPI for all accessions of each species, or groups of accessions with characteristic spectra were combined). Figure 2. Relationships between Vigna subgenus Ceratotropis species on the basis of analysis of polymorphism of four inhibitor systems (TI + CI + SI +CPI). Results were estimated by UPGMA method (NTSYS 1.80). Data on all accessions of each species were combined except for clearly distinctive forms. hirtella*, acc. c-f and i-j (TABLE 1) combined; hirtella**, acc. g and h combined; hirtella*** , acc. a and b combined.. Tetra-trin*, hypothetical Vigna form constructed by subtraction of inhibitor bands characteristic of V. trinervia only from inhibitor set of tetraploid species. radiata*, acc. h (35 in Fig. 1). The inhibitor systems of the tetraploid and diploid forms possibly related to their putative genome donors were similar (Fig. 2). This scheme coincides, in general, to schemes of evolutionary relationships between Ceratotropis species based on morphological characteristics and data of RAPD and isoenzyme analysis [3, 29], however in the case of diploid–polyploid interrelations inhibitor analysis is more informative than RAPD analysis [29]. 3.2. INSECT -AMYLASE INHIBITORS IN SEEDS Seed proteins of Phaseolus and Vigna accessions were separated by isoelectric focusing and inhibitors of mexican bean weevil, Zabrotes subfasciatus, and azuki and bean weevil, Callosobruchus chinensis, -amylases were detected on replicas (Fig. 3). Active and polymorphic insect -amylase inhibitors were found only in some Phaseolus species (P. acutifolius, P. coccineus, P. hybrid, and P. vulgaris) not Vigna, that corresponded with data on inhibitors of Tenebrio molitor amylase [26]. A weak inhibitor of C. chinensis -amylase VARIABILITY OF THE INHIBITORS 7 was found in one accession of P. ritensis (26). We detected inhibitors by their specific activity, while previous reports have identified inhibitors in gels only as low molecular glycoproteins or by immunochemical methods [8, 26]. Sometimes the presence of glycoproteins does not correspond to a protein with inhibitory activity. The main forms of amylase inhibitors characteristic of P. vulgaris [8] (34, AI-1; 35, AI-2; 36, AI-3), including some bands of specific Z. subfasciatus amylase inhibitors (arrowed) which are absent among azuki bean weevil inhibitors, are present in analyzed accessions. Figure 3. Insect -amylase inhibitors in Vigna and Phaseolus species. Seed proteins extracted with water were separated by isoelectric focusing in Servalyt precotes pH 3-10. Z.subfasciatus and C. chinensis -amylase inhibitors were detected in replicas A and B correspondingly. a, b, ..., designations of accessions in TABLE 1. 1-5&37, P. acutifolius (a-e, f) 6&7, P. angustissimus (a&b) 8-10, P. coccineus (a&b) 11-12, P. filiformis (a&b) 13-14 , P. glabellus (a&b) 15&16, P. hybrid (a&b) 17-18, P. leptostachyus (a&b) 19&20, P. maculatus (a&b) 20&21, P. microcarpus (a&b) 22, P. parvulus 23&24, P. polystachios (a&b) 25&26, P. ritensis (a&b) 27&28, P. stenolobus (a&b) 29-36, P. vulgaris (a-e, k, q, t) 38, V. unguiculata (b) 39, V. lasiocarpa (a) 40, V. caracalla (a) 41, V. schimperi 42, V. angularis (a) 43, V. radiata (a) 3.3. PROTEINASE INHIBITORS IN LEAVES Proteinase inhibitors in leaves of various plants are less studied than inhibitors in seeds. Wheat seeds (endosperm) and leaves contain different inhibitor systems [21]. In Vigna and Phaseolus species leaf TI and CI did not correspond to those in the seed and had lower pI values. In both genera species differed by spectra of TI and CI. Obtaining two gelatin replicas from the same separating gel facilitated comparison of inhibitors of both proteinases (Fig. 4). In V. angularis (1-3), three groups of accessions of V. hirtella complex (4-9), V. mungo (16&17) and V. stipulacea (18) most of TI bands coincided in replicas with CI (1-9). In V. reflexo-pilosa (10), V. radiata (11-14) and V. oblongifolia (22-23) only a few bands of both inhibitor types coincided. In one of V. radiata accessions (13-14) CI bands had higher pI than 8 AL.V.KONAREV et al. TI. In V. luteola (20&21), V. unguiculata (24-26), V. lasiocarpa (28-29), V. vexillata (30-32) and V. schimperi (33-34) TI were detected but not CI. In normal undamaged leaves SI were not found. However, V. angularis seedlings damaged by mites contained active SI band with pI near 4.5 (not shown) while TI and CI spectra did not change. Thus, SI may be induced by damaging Vigna leaves. Figure 4. Variability of leaf trypsin and chymotrypsin inhibitors in Vigna species. Leaf proteins extracted with water were separated in Servalyt precotes pH 3-10 and two gelatin replicas were obtained consequently from the same gel. Replicas A and B were developed by trypsin and chymotrypsin correspondingly. a, b, ..., accessions listed in TABLE 1; 2 p., two plants of the same accession. 1-3, V. angularis (a, c, o ) 4&5, V. hirtella (a&b) 2 p. 6, V. hirtella (b, 25 in Fig.1) 7&8, V. hirtella (h, 27 in Fig.1) 2 p. 10, V. reflexo-pilosa (a) 11&12, V.radiata, (a, 33 in Fig.1) 2 p. 13&14, V.radiata (c, 34 in Fig.1) 2 p. 16&17, V. mungo (a) 2 p. 18, V. stipulacea (a) 20&21, V. luteola (a) 2 p. 22&23, V. oblongifolia (a) 2 p. 24&25, V. unguiculata (a) 2 p. 26, V. unguiculata (b) 28&29, V. lasiocarpa 2 p. 30, V. vexillata (k) 31&32, V. vexillata (l) 2 p. 33&34, V. schimperi 2 p. 4. Conclusions Proteinase and amylase inhibitor composition is generally specific for Vigna and Phaseolus species but in some species inhibitors are highly variable. In both genera seeds and leaves contain different proteinase inhibitor systems. Variation revealed and approaches elaborated in this study can be useful in relation to breeding legumes for pest and pathogen resistance. 5. References 1. 2. 3. Cammue, B.P.A, De Bolle, M.F.C., Schoofs, H.M.E., Terras F.R.G., Thevissen, K., Osborn, R.W., Reest, S.B., and Broekaert W.F.: Gene-encoded antimicrobial peptides from plants. Ciba Foundation Symposium 186, “Antimicrobial peptides”, Wiley, Chichester, (1994) 91-106. Carbonero, P., Diaz, I., Vicente-Carbajosa, J., Gaddour, K., Lara, P., Fernandez-Pacios, L. Cereal amylase/trypsin inhibitors and transgenic insect resistance. Abstr. “Genetics and breeding for crop quality and resistance” XV EUCARPIA General Congress, Viterbo , Italy, (1998), 37. Egawa, Y., Chotechuen, S., Tomooka, N., Lairungreang, C., Nakeeraks, P., Thavarasook, C., and Kitbamroong, C.: Collaborative research program on mungbean germplasm (subgenus Ceratotropis of the genus Vigna) between DOA, Thailand and JIRCAS. In: Srinives, P., C. Kitbamroong & S. Miyazaki (eds.) Mungbean VARIABILITY OF THE INHIBITORS 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 9 germplasm:Collection, evaluation and utilization for breeding program, JIRCAS (1996), 1-8. Fernandez, G.C.J., and Shanmugasundaram, S.: The AVRDC Mungbean Improvement Program: The Past, Present and Future. In “Mungbean”, Proc. 2nd Int. Symp. AVRDC. Shanhua, Taiwan, (1988), 58-70. Garcia-Olmedo, F., Salcedo, G., Sanchez-Monge, R., Gomez, L., Royo J. and Carbonero, P.: Plant proteinaceous inhibitors of proteinases and -amylases, Oxf.Surv.Plant. Mol.Cell.Biol. 4 (1987), 275-334. Hilder, V.A., Barker, R.F., Samour, R.A., Gatehouse, A.M., Gatehouse, J.A., Boulter, D.: Protein and c DNA sequences of Bowman-Birk protease inhibitors from cowpea (Vigna unguiculata Walp.), Plant Mol. Biol. 13 (1989), 701-710. Ishimoto, M., and Chrispeels, M.J.: Protective mechanism of the mexican bean weevil against high levels of -amylase inhibitor in the common bean, Plant Physiol. 11 (1996), 393-401. Ishimoto, M., Suzuki, K., Iwanaga, M., Kikuchi, F., Kitamura, K.: Variation of seed -amylase inhibitors in the common bean, Theor. Appl. Genet. 90 (1995), 425-429. Jaaska, V., Jaaska, V. : Isoenzyme variation in Asian beans, Botanica Acta, 103 (1990), 281-390. Kitch, L.W., Murdock ,L.L.: Partial characterisation of a major gut thiol proteinase from larvae of Callosobruchus maculatus F. Insect Biochem Physiol. 3 (1986), 561-575. Klozova, E.: Protein pattern of some legume taxons’ seeds and its chemotaxonomic significance, in K.Muntz (ed.) Proc. Symp. “Seed Proteins of Dicotyledon Plants”, Academie Verlag Berlin (1979), 177-188. Kollipara, K.P. and Hymowitz, T.: Characterization of trypsin and chymotrypsin inhibitors in the wild perennial Glycine species, J. Agric. Food. Chem. 40 (1992), 2356-2363. Konarev, Al.V., and Fomicheva, Yu.V.: Cross analysis of the interaction of -amylase and proteinase components of insects with protein inhibitors from wheat endosperm, Biokhimiya 56 (1991), 628-638. (Translated in English by Plenum Publishing Corp.) Konarev, Al.V., Tomooka, N., and Vaughan. D.A.: Proteinase inhibitor polymorphism in species of the genus Vigna Savi subgenus Ceratotropis, (in preparation). Konarev, Al.V.: Analysis of protease inhibitors from wheat grain by gelatine replicas method, Biokhimiya 51 (1986), 195-201. (Translated in English by Plenum Publishing Corp.) 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In: Biochemical identification of varieties (Materials III International symposium ISTA, Leningrad, USSR, 1987) Leningrad, N.I.Vavilov Institute of Plant Industry (1988), 176-181. Konarev, Al.V.: Variability of trypsin-like proteinase inhibitors in wheat and related cereals in connection with resistance to grain pests, Selkochozajstvennaya biologia 5 (1987), 17-24. (In Russian) Konarev, V.G., Gavrilyuk, I.P., Gubareva, N.K., Peneva, T.I., Chmeleva, Z.V., Konarev A.V., Akhmetov R.R., Giljazetdinov Sh.Ja., Sidorova, V.V., Anisimova, I.N., Eggi, E.E., Vvedenskaya, I.O., Khakimova, A.G., Kudryakova, N.V.: Molecular biological aspects of applied botany, genetics and plant breeding. Series “Theoretical basis of breeding”, Vol.1, St.-Petersburg, VIR 1996. Lumpkin, T.A., and McClary, D.C.: Azuki bean: Botany, production and uses, Cambridge University Press 1994. Marechal, R., Mascherpa, J.M., and Stainer F. 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Tomooka, N., Lairungreang, C. and Egawa, Y.: Taxonomic position of wild Vigna species collected in Thailand based on RAPD analysis. In: Srinives, P., C. Kitbamroong & S. Miyazaki (eds.) Mungbean germplasm: Collection, ealuation and utilization for breeding program. JIRCAS (1996), 31-4. 10 AL.V.KONAREV et al. APPENDIX TABLE 1. Accessions of Vigna and Phaseolus used in the study. Species Accessions V. luteola a&b V. marina V. oblongifolia a&b V. membranacea V. unguiculata a-c V. vexillata a-l V. angularis a-d V. umbellata V. minima e-o a-c a-f V. hirtella a-j V. nepalensis a&b V. trinervia V. reflexo-pilosa ssp. reflexo-pilosa a&b ssp. glabra a&b V. radiata a-g V. mungo a-h V. grandiflora a&b V. aconitifolia a&b V. stipulacea a&b PI: 354915 & 406329 PI: 360072 PI: 406352 & 406354 PI: 292867 PI: 406365, 427087 & 292883 PI: 406391, 406387, 280132, 406400, 406390, 406393, 365095365097, 406383, 406401, 225934 03031366, 03013592, 03028830, PI 527686 11 populations collected in Japan 03025780, 03031356, PI 220249 03028839, 03030456, 03028854, 03028850, 03028849, 03028840 03030505, 03031362, NI1377, NI1394, NI 970, NI 971, 03031363, 03031364, 03031369, 03031370 03028851 & 03031368 03028858 03028860 & 03030466 03031365 & NI1185 03025800, 00035043, 03028846, 03028847, 03028845, NI876, NI1135 03031349, 03019941, 03027092, 03026841, 03028842, 03028843, 03028844, 03028848 03028832 & 03031348 03020037 & 03020041 NI251 & NI1030 Species V. lasiocarpa V. longifolia V. caracalla V. adenantha V. schimperi Phaseolus : P. vulgaris Accessions a&b a&b a&b a&b PI 306376 PI 310294 PI 195333 & 322586 PI 312898 & 319444 PI 337032 a-e W6 17000, PI 319441, PI: 326054, 535411 & PI 535414 G02771,G06388, G12866, G12888,TO G12882, TS,G:10009, 12915A, 19892,Taishou-kintoki G12932,TAr4, G12923 G01221,G02744, G03453, G04270,G04287, G09998 W6 15625, PI: 535200, 535201, 535233, 535240 PI 3111897, Nayarit PI: 535272, 535273 PI: 311165, 311171 & 313417 PI: 535293 & 535294 W6 15688 & PI 535311 PI: 378974 & 390535 PI: 535315 & 535329 PI 535350 PI 535353 & 535358 PI 511998 PI: 264607 & 264608 PI: 494138 & 535372 W6 15587 & W6 15704 Lines with AI-0 f-j AI-1 k-p AI-2 q-s AI-3 t-y P. acutifolius a-e f&g P. angustissimus P. coccineus a-c P. filiformis a-b P. glabellus a-b P. hybrid a-b P. leptostachyus a-b P. maculatus P. microcarpus a-b P. parvulus P. polystachios a-b P. ritensis a-b P. stenolobus a-b a, b,..., designation of accessions; PI and W6 – accessions from USDA gene bank system; lines of Phaseolus differing in -amylases were provided by the National Agricultural Research Institute, Japan including accessions with G prefix originally from CIAT,Colombia; NI accessions from the Phaseolinae collection, Jardin Botanique National de Belgium; eight-digit numbered materials from Japanese MAFF gene bank.