Inheritance of resistance to an Aflatoxin-producing fungus (Aspergillus flavus) in peanut (Arachis hypogaea L.)
1981
Arak Jantasilp
Two cultivars of peanut resistant to seed infection by Aspergillus flavus were crossed to four susceptible ones (including reciprocal crosses) to study yield, heterosis and heterobeltiosis of F1 hybrids and the inheritance of resistance. Three of F1 crosses gave maximum yield on dry seed-weight basis and significantly different from other crosses involving their parents. Highest (48.15%) and lowest (-75.06%) heterosis was found in number of immature pods and rotten pods per plant, whereas highest (11.77%) and lowest (-83.15%) heterobeltiosis was found in mature pod weight per plant and number of immature pods and rotten pods per plant, respectively. Resistance to seed colonization by A. flavus was likely to be a quantitative character. However, it expressed no dominance in P.I. 337394 F and incomplete dominance in P.I. 337409. At least one to five pairs of resistant genes were detected with broad sense heritability ranging from 37.61% to 79.65%. Gene action depended on different crosses, nine out of sixteen cross combinations showed that non-additive gene action was significant in controlling the resistance whereas the others showed significance of additive gene action. Electrophoresis was conducted to determine the difference between resistant and susceptible cultivars. No difference in protein banding patterns was found except peak height of graph presentations converted by scanning spectrophotometer. Sixty-six percent of variation in resistance to seed infection by A. flavus can be accounted for the peak height
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This bibliographic record has been provided by Southeast Asian Regional Center for Graduate Study and Research in Agriculture