“ANALYSIS OF GENETIC VARIATION FOR DIFFERENT MORPHOLOGICAL, SEED YIELD AND NUTRITIONAL TRAITS IN COLOURED PERICARPED GERMPLASM OF RICE (Oryza sativa L.)”
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Date
2008
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The experiment was conducted at Instructional cum Research Farm, Department
of Plant Breeding and Genetics, College of Agriculture, Indira Gandhi Krishi
Vishwavidyalaya, Raipur, Chhattisgarh, India, during Kharif 2007 to assess the variation
for different morphological, seed yield and nutritional traits in 200 coloured pericarped
germplasm of rice including 5 varieties namely Poornima, Danteshwari, Samleshwari,
Chandrahasini and Mahamaya.
Morphological characterization revealed that more than 98 per cent germplasm
was having the anthocyanin pigmentation on any plant part under observation. Similarly,
majority of the genotypes had semi-erect plant habit and erect leaves. More than 51 per
cent genotypes are having slender grain type while, others were having medium grains.
The analysis of variance for metric traits indicated that the mean sum of squares
due to blocks were non significant for all the traits except grain length. The mean sum of
squares due to checks were significant for panicle length, leaf length, days to 50%
flowering, hundred seed weight, grain length, grain breadth, length:breadth ratio of grain
and total number of grains per panicle.
The high magnitude of coefficient of variation was noted for number of unfilled
spikelets, number of filled spikelets, number of total grains per panicle and seed yield per
plant showing existence of wider variability for these traits, which could be exploited in
future breeding programme.
The simple correlation and path analysis carried out for thirteen yield attributing
characters indicated that plant height, panicle length, leaf length, days to 50% flowering,
number of filled grains per panicle, total grains per panicle and effective tillers per plant
showed high positive and significant correlation with seed yield per plant. High direct
positive contribution on seed yield was shown by number of effective tillers per plant,
days to 50% flowering, number of filled grains per panicle, length:breadth ratio of grain,
hundred seed weight and total grains per panicle.
Nutritional analysis revealed that there is no effect of pigmentation on the
concentration of iron and zinc. However, there are genotypic differences for these
micronutrients. The highest concentration of iron was found in genotype Lankeshwari.
Similarly, zinc concentration was highest in white pericarped rice variety Poornima. The
genotypes having higher concentration of iron (Lankeshwari) and zinc (Poornima) can be
used in nutritional rice breeding programme.
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173 p.