POPULATION GENETIC STRUCTURE AND COMPARATIVE MOLECULAR DIVERSITY IN SELECTED LANDRACES OF BRINJAL (Solanum melongena L.)
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Date
2016-01
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE, GKVK POST, BANGALURU)
Abstract
Population genetic structure and comparative molecular diversity of brinjal (SolanummelongenaL.) landrace populations prevailing in different geographic region of Karnataka was elucidated using morphological traits and SSR markers. Highly significant variance was noticed for 13 characters viz., plant height, plant spread, leaf length, leaf width, flowering time, number of flowers per inflorescence, fruit length, fruit diameter, fruit length to diameter ratio, fruit diameter of pistil scar, fruit length of peduncle, time of physiological ripeness and total yield per plant. High GCV and PCV values were recorded for all morphological traits among the populations studied. Within each population at least 2-3 distinct types could be recorded based on fruit and phenology traits. Variation for fruit traits and growth habit was conspicuous in majority of landrace populations. At whole population level, the variance was highly significant among the population for all the 13 characters. The population genetic structure analysis using 20 SSR markers revealed existence of variation among the population. Twenty SSR detected 54 alleles, with an average 2.7 alleles per loci. The F-value varied from 0.101 for SSR marker SM 126 to 0.73 for the marker SM 151. The SSR loci differed in their capacity to detect the genetic diversity. The proportion of Analysis of Molecular Variance (AMOVA) among and within population was found to be 33 per cent and 67 per cent respectively. The maximum net nucleotide distance was observed between in S2(0.000)and S3 (0.0045) groups indicating higher genetic diversity among those populations.