Correlation of Aflatoxin Resistance and Drought Tolerance Traits in Peanuts
May 28, 2010| |
Previous research suggested that drought tolerance in peanut may be used as an indirect selection tool for resistance to pre-harvest aflatoxin contamination. Thus, A. Arunyanark of Khon Kaen University in Thailand and colleagues conducted a study to evaluate 140 peanut families from four crosses in field trials under drought and non-drought conditions to assess the heritability of aflatoxin resistance traits, as well as the genetic relationship of aflatoxin resistance and drought tolerance traits. The researchers recorded relevant data such as seed infection by Aspergillus flavus (the aflatoxin pathogen), aflatoxin contamination, biomass, pod yield, drought tolerance index of biomass and pod yield, SPAD chlorophyll meter reading, and specific leaf area.
Based on the findings, there is low to moderate heritability for seed infection and aflatoxin contamination, which implies that it would be hard to improve these traits. However, genotypes for seed infection and aflatoxin contamination have negative correlation with drought tolerance traits under drought conditions. This means that genotype selection for drought tolerance could improve aflatoxin resistance. Specific leaf area and SPAD chlorophyll meter reading are indirect indicators of aflatoxin resistance, thus these simple measurements could be used for large scale breeding programs.
The abstract of this study is available at http://dx.doi.org/10.1016/j.fcr.2010.03.011.
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