Photosynthetic efficiency and nutrient uptake in wheat grown under timely, late and very late sown conditions
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Date
2022-07
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CCSHAU Hisar
Abstract
The present investigation was conducted with six wheat genotypes viz. WH147, WH711, WH
1105, WH 1184 WH1021 and HD2967 grown to study the photosynthetic efficiency and nutrient
uptake and other physiological traits under timely (TS), late (LS) and very late (VLS) conditions on six
wheat genotypes, during rabi season of 2021-22 at screen house, Department of Botany and Plant
Physiology, CCS HAU, Hisar. Data were recorded for various morphological traits including number
of days to heading, number of days to maturity, plant height (cm), spike length (cm), number of
spikelets per spike, number of grains per spike, 1000-grain weight (g), grain yield per plant (g), plant
biomass (g), heat susceptibility index. The physiological parameters include canopy temperature,
transpiration rate, photosynthetic rate, stomatal conductance, chlorophyll content, anothocynin content,
NPK content were studied. Reduction in physiological parameters, growth and yield components was
observed in all genotypes under LS and VLS in all genotypes. Photosynthetic rate, maximum in
WH1021 followed by HD2967 at 7 and 14 DAA under TS, LS and VLS conditions. Wheat variety
HD2967 showed maximum N, P, K content followed by WH1021 under TS, LS and VLS conditions.
Plant biomass was maximum in HD2967 followed by WH711 and WH1021. However grain yield
(g/plant) and 1000 grain weight was reported maximum in HD2967 followed by WH1021, WH1184,
WH1105, WH711 and WH147. Similar results were observed for 1000 grain weight under LS and VLS
conditions. Wheat genotype HD2967 followed WH1021 can be considered as heat tolerant on the basis
of less reduction in growth, physiological traits, yield and its attributes under LS and VLS as compared
to TS conditions.