MORPHOLOGICAL AND MOLECULAR DIVERSITY FOR GRAIN AND NUTRITIONAL QUALITY IN RED RICE (Oryza sativa L.) GENOTYPES
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Date
2009-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
An investigation was carried out during Kharif 2008 at Zonal Agricultural Research
Station, Mudigere, UAS, Bengaluru, to assess genetic diversity in terms of morphological,
physico-chemical and molecular features among the red rice genotypes.
Significant variability was observed for all 14 morphological traits and 14 physicochemical
traits in 110 and 90 red rice genotypes respectively. All the genetic variability
parameters like GCV, PCV, heritability and genetic advance as per cent mean were high for
spikelets per panicle, fertile spikelets, panicle exersion and straw yield per lot (2.2 sq.m. plot),
total phenols content, nitrogen and Iron content of rice kernels. Positive significant correlation
was observed for grain yield with days to 50 per cent flowering, plant height, straw yield,
days to maturity and panicle length, significant negative correlation was observed for kernel
length and kernel L:B ratio. In genotypic path coefficient straw yield and kernel L:B ratio had
higher magnitude o f positive direct effect on grain yield.
Grain yield per plot and total phenols content of kernels contributed greatly towards
divergence. Morphological and physico-chemical diversity in the genotypes could classify all
genotypes in 11 clusters each in both cases, with cluster I and cluster VII being largest
respectively.
Molecular diversity of 90 genotypes using 12 SSR markers classified them into six
clusters. Polymorphism Information Content (PIC) value was ranged from 0.09 to 0.83 across
the markers. The maximum (19 per cent) and minimum (Zero per cent) dissimilarity was
found to be between DWR-4064 (WLS) and IET-13883, between KHRS-33 and KHRS-34
respectively.
Morphological, physico-chemical and molecular information generated similar
diversity patterns. Information generated on red rice genotypes is eminently suitable for
proprietary purpose besides its use in the genetic enhancement of native rice.
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