Vol. 7 (4) : July-August 2016 issue
Green Farming Vol. 7 (4) : 760-764 ; July-August, 2016
Bi-plot analysis of drought tolerance indices in bread wheat (Triticum aestivum L.)
SUNIL KUMAR JATAV1* and V.S. KANDALKAR2
Department of Genetics and Plant Breeding, College of Agriculture, Gwalior, Rajmata Vijayaraje Scindia Krishi Vishva Vidyalaya, Gwalior - 474 005 (Madhya Pradesh)
Designation : 1Ph.D. Scholar *(katares88@gmail.com), 2Principal Scientist
Subject : Crop Genetics and Plant Breeding
Paper No. : P-4328
Total Pages : 5
Received : 05 October 2015
Revised accepted : 30 May 2016
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Citation :
SUNIL KUMAR JATAV and V.S. KANDALKAR. 2016. Bi-plot analysis of drought tolerance indices in bread wheat (Triticum aestivum L.). Green Farming Vol. 7 (4) : 760-764 ; July-August, 2016
ABSTRACT
Post-anthesis drought stress is the most important factor touching wheat production adversely in dryland area. In order to assess drought tolerance in bread wheat germplasm, an experiment was conducted with 125 promising genotypes along with checks in Randomized block design with two replications under water stress and non-stress environments during the year 2013. Post-anthesis stress was created by spraying potassium iodide 0.5% 14 days after anthesis. Different drought tolerance / resistance indices viz., stress tolerance index (STI), mean productivity (MP) and canopy temperature index (CTI) were evaluated based on grain yield under stress (GYS) and non-stress (GYNS) conditions. Genotypes viz., HD 3012, 21HRWSN 2056 and 31ESWYT 147 recorded significantly higher grain yield under both stress and non-stress conditions along with STI, CTI and MP except 31ESWYT 147 for MP. Further, 31ESWYT 125, HUW 620, PBW 629 and HS 523 were recorded significantly higher grain yield in stress condition along with MP, STI and CTI. Correlation coefficient recorded significant and positive relation between grain yield in the stress environment with MP and STI. Principal component analysis (PCA) revealed that first 2 principal components exhibited more than one Eigen values, which explained about 78.78 % of total variation. The PC1 having indices GYS, MP and STI in the formation of this component has the highest contribution of variations (52.90%) and PC2 with GYS and CTI (25.89%).The PC1 showed 52.90% variability with Eigen values of 2.64 in genotypes which then reduced gradually. Indices, GYS, CTI and STI were most stress indicators for screening the wheat varieties. Genotypes viz. 31ESWYT 147, HD 3012, VW- 0770, 31 ESWYT 125, WR-2100, 31 ESWYT 132, HD 2864 and HS 523 were led as high yielding tolerant genotypes and could be used in future breeding for stress tolerance with high yield potential.
Key words :
Drought stress indices, Post anthesis drought, Principal components analysis, Wheat germplasm screening.