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Evaluation of wheat genotypes for heat tolerance under tarai conditions of Uttarakhand

KrishiKosh

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Title Evaluation of wheat genotypes for heat tolerance under tarai conditions of Uttarakhand
 
Creator Karki, Bhagwan Singh
 
Contributor Verma, R.S.
 
Subject wheats, genotypes, sowing date, genotypes, heat stress, heat tolerance
 
Description Thesis-PhD
The present investigation was carried out during rabi seasons of 2009-10 and 2010-11 at Norman E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar. The experiment was laid out in split-plot design with three dates of sowing viz. November 23, December 8 and December 23 as main-plot treatments and twelve wheat genotypes viz, HD 2967, HD 3007, HUW 625, MP 4106, PBW 617, PBW 621, UP 2628, UP 2684, UP 2691, UP 2744, UP 2755 and VL 920 as sub-plot treatments with four
replications. Due to lodging problem in UP 2691, it was replaced with UP 2572 during crop season 2010-11. The results indicated that late sowing (December 23) caused significant reduction in plant stand, number of shoots m-2 at 30, 40, 50, 60 and 70 days after sowing, number of ear bearing shoots m-2, plant height, flag leaf area and its dry weight, leaf area index, chlorophyll content, ratio of variable chlorophyll fluorescence to maximal chlorophyll fluorescence and relative water content in flag leaf of wheat genotypes as compared to
November 23 sowing. But specific leaf weight significantly increased with each delay in sowing. Leaf chlorophyll content was higher in genotypes HD 2967 and PBW 621 at most of the crop stages. Late sowings adversely influenced pre and post-anthesis phenology of wheat. Delay in sowing from November 23 to December 23 resulted in significant reduction in grain yield as well as straw yield (24.2% and 9.1 %, respectively). On an average, a grain yield loss of 33.3 kg ha-1day-1 was caused due to late sowing of crop (December 23) as compared to November 23 sowing. Genotype PBW 621 followed by HUW 625 and PBW 617 produced highest grain yield under late sowing and thus proved to be tolerant to high temperature stress
conditions. Yield attributes like number of ear bearing shoots per unit area, grain number and grain weight per spike, 1000 grain weight and harvest index appeared to be important traits for sustaining grain yield under late sown conditions. Heat susceptibility indices calculated for grain yield and number of ear bearing shoots m-2 indicated PBW 621 as most heat tolerant genotype.
 
Date 2016-06-15T14:31:04Z
2016-06-15T14:31:04Z
2013-05
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67419
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)