Affiliation:
1. Key Laboratory of Crop Physiology Ecology and Production Management, Nanjing Agricultural University Nanjing Jiangsu China
2. Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education South China Agricultural University Guangzhou China
3. Henry Fork School of Biology and Agriculture, Shaoguan University Shaoguan China
4. Department of Botany Government Gandhi Memorial Science College, Cluster University Jammu Jammu and Kashmir India
Abstract
AbstractDrought stress is one of the most serious environmental stress factor constraining crop production across the globe. Among cereals, wheat grains are very sensitive to drought as a small degree of stress can affect the enzymatic system. This study aimed to investigate whether nitrogen and pre‐anthesis drought priming could enhance the action of major regulatory enzymes involved in starch accumulation and protein synthesis in bread wheat (Triticum aestivum L.). For this purpose, cultivars YM‐158 (medium gluten) and YM‐22 (low gluten) were grown in rain‐controlled conditions under two nitrogen levels, that is, N180 (N1) and N300 (N2). Drought priming was applied at the jointing stage and drought stress was applied 7 days after anthesis. Drought stress reduced starch content but enhanced protein content in grains. N2 and primed plants kept higher contents of nonstructural carbohydrates, fructans, and sucrose; with higher activity of sucrose‐phosphate synthase in flag leaves. Furthermore, N2 and priming treatments showed higher sink ability to develop grains by showing higher sucrose‐to‐starch conversion activities of adenosine diphosphate‐glucose pyrophosphorylase, uridine diphosphate glucose pyrophosphorylase, sucrose‐synthase, soluble‐starch synthase, starch branching enzyme, and granule‐bound starch synthase as compared to N1 and non‐primed treatments. The application of N2 and primed treatment showed a greater ability to maintain grain filling in both cultivars as compared to N1 and non‐primed crops. Our study suggested that high nitrogen has the potential to enhance the effect of pre‐drought priming to change source‐sink relationships and grain yield of wheat under drought stress during the filling process.
Funder
National Natural Science Foundation of China
Subject
Cell Biology,Plant Science,Genetics,General Medicine,Physiology
Cited by
2 articles.
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