Agri 2022

Sustainable production of Bread Wheat Under Terminal Heat Stress: An investigation of foliar selenium mediated biochemical regulations in association with yield

Muhammad Shahid

Muhammad Shahid, Speaker at Agriculture Conferences 2022
University of Agriculture, Pakistan
Title : Sustainable production of Bread Wheat Under Terminal Heat Stress: An investigation of foliar selenium mediated biochemical regulations in association with yield

Abstract:

Background: Acquaintance of reproductive stages of wheat with heat is a leading constraint in achieving food security.

Objectives: A study was conducted with objective to investigate heat sensitivity of terminal stages of wheat, to optimize foliar selenium dose to boost non-enzymatic antioxidants and to determine correlation of these non-enzymatic antioxidants with yield and quality attributes of wheat crop. Methodology: The experiment was performed over two years at Agronomic Research Area, University of Agriculture Faisalabad, Pakistan. The experiment was laid out in randomized complete block design under split arrangement and treatments were replicated thrice. Treatments were comprised of (a) heat imposition in main plot viz. H0 = No heat stress; H1 = Heat from spike to grain filling H2 = Heat from flowering to grain filling (b) foliar selenium in sub plot viz. Se0 = Control (water spray); Se25 = 25 mg L-1; Se50 = 50 mg L-1; Se75 = 75 mg L-1 and Se100 = 100 mg L-1.

Results: More deleterious impacts of H1 were recorded compared to H2 and H0 for all response variables.  Similar and more proline, phenolics and leaf selenium were recorded with 75 and 100 mg L-1 selenium under H0. Whereas under H1 and H2, significantly higher responses were observed with 100 mg L-1 selenium for these traits. More and alike chlorophyll, grain proteins were measured with 75 and 100 mg L-1 selenium; and 1000-grain weight, harvest index and grain yield with 50, 75 and 100 mg L-1 selenium across the H0, H1 and H2. Moreover, strong positive and significant association of proline, phenolics, leaf selenium and chlorophyll were measured with yield of wheat.

Conclusion: Applying 75 mg L-1 Se proved beneficial under H0 while 100 mg L-1 Se depicted more promising responses under H1 and H2 based on recorded physiochemical and agronomic attributes

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