Abstract
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 morpho-physiological 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 morpho-physiological 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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Abbreviations
- RWC:
-
Relative water content
- ASI:
-
Anthesis-silking interval
- RL:
-
Root length
- CC:
-
Chlorophyll content
- LAI:
-
Leaf area index
- QTL:
-
Quantitative trait locus
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The authors sincerely acknowledge the National Agricultural Innovation Project (NAIP) for their financial support to carry out this research.
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Nepolean, T., Singh, I., Hossain, F. et al. Molecular characterization and assessment of genetic diversity of inbred lines showing variability for drought tolerance in maize. J. Plant Biochem. Biotechnol. 22, 71–79 (2013). https://doi.org/10.1007/s13562-012-0112-7
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DOI: https://doi.org/10.1007/s13562-012-0112-7