Assessment of the importance of alpha-amylase inhibitor-2 in bruchid resistance of wild common bean.
Theor Appl Genet
; 114(4): 755-64, 2007 Feb.
Article
em En
| MEDLINE
| ID: mdl-17186215
ABSTRACT
Both alpha-amylase inhibitor-2 (alphaAI-2) and arcelin have been implicated in resistance of wild common bean (Phaseolus vulgaris L.) to the Mexican bean weevil (Zabrotes subfasciatus Boheman). Near isogenic lines (NILs) for arcelin 1-5 were generated by backcrossing wild common bean accessions with a cultivated variety. Whereas seeds of a wild accession (G12953) containing both alphaAI-2 and arcelin 4 were completely resistant to Z. subfasciatus, those of the corresponding NIL were susceptible to infestation, suggesting that the principal determinant of resistance was lost during backcrossing. Three independent lines of transgenic azuki bean [Vigna angularis (Willd.) Ohwi and Ohashi] expressing alphaAI-2 accumulated high levels of this protein in seeds. The expression of alphaAI-2 in these lines conferred protection against the azuki bean weevil (Callosobruchus chinensis L.), likely through inhibition of larval digestive alpha-amylase. However, although the seed content of alphaAI-2 in these transgenic lines was similar to that in a wild accession of common bean (G12953), it did not confer a level of resistance to Z. subfasciatus similar to that of the wild accession. These results suggest that alphaAI-2 alone does not provide a high level of resistance to Z. subfasciatus. However, alphaAI-2 is an effective insecticidal protein with a spectrum of activity distinct from that of alphaAI-1, and it may prove beneficial in genetic engineering of insect resistance in legumes.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
/
Proteínas de Plantas
/
Glicoproteínas
/
Phaseolus
/
Gorgulhos
/
Imunidade Inata
Limite:
Animals
Idioma:
En
Revista:
Theor Appl Genet
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Japão