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Morpho-physiological bases of shade tolerance in wheat varieties

KrishiKosh

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Title Morpho-physiological bases of shade tolerance in wheat varieties
 
Creator Lakshmanakumar, P.
 
Contributor Bana, O.P.S.
 
Subject plant morphology, shading, wheats, plant physiology, growth rate, photosynthesis, yield components, tillage
 
Description Thesis-PhD
The present investigation was carried out during rabi seasons of 2010-11 and 2011-12 at Norman E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar, entitled “Morpho-physiological bases of shade tolerance in wheat varieties”. The experiment was laid out in split-plot design with three main-plot treatments viz, three degree of shades (full, 2/3 and 1/3 of full sunlight availability) and five sub-plots i.e. wheat varieties (viz, UP 2684, UP 2526, UP 2565, UP 2113 and PDW 233) with three replications. The observations were recorded on morphological (i.e. tillering, shoot height, leaf length, leaf width, internodal length and dry weights etc.), physiological (i.e. chlorophyll content, intercellular CO2 concentration, photosynthetic rate, stomatal conductance and transpiration rate), growth & development and yield and yield attributes of wheat varieties under varying degree of shades. Average grain and straw yield of wheat varieties showed a slightly (51.9 and 35.3 per cent in 2010-11 and 52.3 and 42.0 per cent in 2011-12) reduction under severe shaded treatment, respectively, compare to full sunlight (control). The shade treatment had significant effect on the shoot height, tillering and internodal characteristics of the wheat varieties. Average dry matter accumulation in leaves, stem and spikes was reduction under varying degree of shades compare to full sunlight. Crop growth rate, relative growth rate, net assimilation rate, leaf area ratio, leaf area index and specific leaf weight varied amongst varieties but was also influenced by varying degree of shades. Among the wheat varieties, PDW 233 yielded maximum grain than other varieties under all the shaded treatment, however, under severe shade choice can be made between PDW 233 and UP 2684. Number of grains/spike, number of fertile spikes/m2 and 1000 grain weight (g) appeared to be most important yield attributes. Path coefficient analysis revealed that fertile spikelets/spike, grain weight/spike and 1000 grain weight exerted high positive direct effect on grain yield.
 
Date 2016-08-09T15:20:24Z
2016-08-09T15:20:24Z
2012-07
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71778
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)