Journal
JOURNAL OF PLANT BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 22, Issue 1, Pages 71-79Publisher
SPRINGER INDIA
DOI: 10.1007/s13562-012-0112-7
Keywords
Genetic diversity; SSRs; Drought; Mapping population; Heterotic grouping; Maize
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Funding
- National Agricultural Innovation Project (NAIP)
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A set of 24 genotypes bred at different centres in India as well as in CIMMYT showing variability for drought tolerance were selected for molecular and morphophysiological characterization. A set of 35 SSR markers, having genome-wide coverage, was chosen for genotyping the inbreds. These markers generated a total of 111 polymorphic alleles with an average of 3.17 alleles per locus. The minimum and maximum PIC value was 0.27 and 0.77 with a mean of 0.5. A total of 13 unique alleles were found in the 24 inbred lines. The coefficient of genetic dissimilarity ranged from 0.192 to 0.803. NJ-based tree suggested the presence of three major clusters of which, two of them had subgroups. Phenotyping of inbreds by morphophysiological traits revealed that there was a positive relationship among root length, chlorophyll content, relative water content while anthesis-silking interval was negative relationship with all these traits. Genotyping data complemented by morpho-physiological parameters were used to identify a number of pair-wise combinations for the development of mapping population segregating for drought tolerance and potential heterotic pairs for the development of drought tolerant hybrids.
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