Abstract

Heat stress at reproductive stages of wheat causes grain shriveling. The present study aimed at comparing thermo-sensitivity of terminal stages of wheat and optimization of foliar potassium to alleviate heat and to determine correlation of biochemical attributes with agronomic attributes. The experiment was laid out in a randomized complete block design under split treatment structure and replicated thrice. Main plot was comprised of heat stress (H), viz. H₀ = no heat imposition; H₁ = heat stress imposition from complete emergence of spike to grain filling initiation, and H₂ = heat stress imposition from flowering initiation to grain filling initiation. Foliar potassium (K) sprays consisted of K₀ = control (water spray); K₁₅ = 15; K₃₀ = 30; K₄₅ = 45; and K₆₀ = 60 g L⁻¹. Under “H₀” similar and more glycine betaine, water relations and lesser malondialdehyde were recorded with 45 and 60 g L⁻¹ K, While 60 g L⁻¹ K proved more beneficial under “H₁” and “H₂” for these attributes, “H₁” proved more damaging compared with “H₀” and “H₂” for grain yield and yield components, while similar and more improvements in grain yield and yield components were recorded with 45 and 60 g L⁻¹ K compared with other doses. Conclusively, more deleterious responses were observed under “H₁” compared with other heat treatments. Application of 40 g L⁻¹ K under “H₀” and 60 g L⁻¹ K under heat stress exhibited more remarkable responses. Moreover, a strong association of biochemical attributes with agronomic parameters was recorded.

中文翻译：

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甘氨酸甜菜碱和丙二醛中叶钾诱导的调控与热胁迫面包小麦的籽粒产量相关

摘要

小麦生殖阶段的热应激导致谷物萎缩。本研究旨在比较小麦末期的热敏性和优化叶面钾以减轻热量并确定生化特性与农艺特性的相关性。该实验采用随机完整区组设计，采用分割处理结构并重复三次。主图由热应力（H）组成。H ₀  =无热量；H ₁  =从穗完全出现到籽粒灌浆开始的 热应力强加，H ₂ =从开花期到籽粒灌浆开始的热应力强加。叶面喷钾（K）由K ₀  =对照（喷水）组成；ķ₁₅  = 15; K ₃₀  = 30；K ₄₅  = 45；并且K ₆₀  ＝ 60g L ^-1。在“ H ₀ ”下，甘氨酸甜菜碱相似且更多，在45和60 g L ^-1  K下记录的水关系和较少的丙二醛，而 在“ H ₁ ”和“ H ₂ ”下证明60 g L ^-1 K更有利。属性，“ H ₁ ”对谷物的产量和产量构成比“ H ₀ ”和“ H ₂ ”更具破坏性，而在45和60 g L ^-1时，谷物的产量和产量构成具有类似且更多的改善 钾与其他剂量相比。结论是，与其他热处理相比，在“ H ₁ ”下观察到了更多的有害反应。 在“ H ₀ ”下^施加40 g L ^-1 K和 在热应力下施加60 g L ^-1 K表现出更显着的响应。此外，记录了生物化学属性与农艺参数的强烈关联。