Genetic diversity analysis for morphological traits and stripe rust resistance in wheat (Triticum aestivum L.em. Thell)
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Date
2016
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Publisher
CCSHAU
Abstract
The present investigation “Genetic diversity analysis for morphological traits and
stripe rust resistance in wheat (Triticum aestivum L. em. Thell)” was carried out with the
objective of characterizing 49 wheat genotypes on the basis of 14 morpho-physiological
characters and to study the DNA polymorphism on the basis of SSR markers. Mean sum of
squares due to genotypes were significant for all the quantitative characters (except grain
length and grain breadth) indicating sufficient magnitude of variations. Correlation
coefficients showed that genotypes having high grain yield were also better in number of
productive tillers, plant height, 1000 grain weight, spike length, spike weight, number of
spikelets/spike, number of grains/spike, flag leaf area, biological yield and harvest index
indicating the importance of these characters for high grain yield. The magnitude of direct
effects showed that harvest index, biological yield, number of tillers and spike weight was
important for improvement of grain yield. The level of polymorphism displayed by the SSR
markers was considerably high in the present analysis, as reflected by the high mean PIC
value (0.95). At phenotypic level (D
2
analysis) the genotypes were classified into seven
clusters whereas, DNA analysis classified all the 49 genotypes into nine sub groups which are
more precise. Therefore, classification on the basis of SSRs markers could be more relied
upon for developing breeding strategies in wheat.
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Keywords
Rice, Planting, Biological phenomena, Vegetative propagation, Biological interaction, Eggs, Meloidogyne graminicola, Crops, Biological development, Organic amendments