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| Effects of Drought during Peanut(Arachis hypogaea L.) Seeding Stage on Disease Resistance Gene PnAG3 Expression and Physiological Index Related to Drought Resistance |
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Abstract With the changes of soil moisture, the PnAG3 expression changed in the several peanuts (anti-Aspergillus flavus species J11, HY22 and susceptible peanut species JH1012) growing in the pot, while their physiological index related to drought resistance was also changed. The results showed that the Superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) activities of anti-Aspergillus flatus species had increased 3.15, 2.55 and 4.95 times in 40%~55% of field maximum water capacity treatment group, respectively. But the SOD, POD and CAT activity of susceptible species in the three treatment groups had no significant difference. Malondialdehyde(MDA) contents were increased in all treat groups, and it was higher in susceptible peanut species than that of anti-Aspergillus flavus species. PnAG3 expression levels were higher in anti-Aspergillus flavus species than that of susceptible peanut species. But the maximum expression level of anti-Aspergillus flavus species was appeared earlier than that of susceptible species which was similar to the CAT activity changes. Overall, SOD was continued to rise. But the PnAG3 gene expression, and POD, CAT and MDA showed a tendency of "up-down". Combined with the physiological index related to drought resistance and the PnAG3 expression changes, there was a correlation between the variation trend of PnAG3 expression and adversity physiological indexes. And the PnAG3 expression in resistant varieties was higher than that of susceptible varieties. So that, the function of PnAG3 may be relevant to the peanut stress resistance.This study provides a basis for further research on resistance breeding and germplasm screening of peanut.
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Received: 22 December 2011
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