Scholarlink

<p>The transition from returning green to the jointing stage is critical for wheat architecture and yield. The water conditions during this period will significantly impact the tillers stability, physiological characteristics and grain yield. The current study aimed that drought at an earlier crop growth stage can enhance the crop potential to tolerate the subsequent drought stress by triggering a faster and stronger defense mechanism. To determine the effect of drought before and after jointing on the physiological characteristics of tiller development and spike formation at different tillering positions, this two-year pot experiment investigated the impact of varying drought stress levels during the returning greening and jointing stages in two winter wheat varieties i.e., “Shannong 29” (SN29) and “Heng 0628” (H0628). We subjected plants to nine water treatments, including mild and severe drought, and assessed tiller numbers, spike rates, physiological parameters (SOD, MDA, net photosynthesis, soluble protein, total nitrogen, sugar-to-nitrogen ratio), and yield. Results showed that drought significantly impacted tillers than the main stem, particularly during the jointing. Mild drought after returning green reduced tiller numbers but increased spike rates. Severe and prolonged drought decreased the spike rate of III, Ip, and IV tillers in both varieties. Mild drought increased SOD activity and MDA content, reduced net photosynthesis, and altered nitrogen and sugar ratios, with rehydration promoting recovery. Short-term mild drought at returning green and jointing increased yield, while severe and prolonged mild drought decreased it. The increased yield per spike under mild drought was associated with enhanced spike yield, maintained tillering in lower tillers, improved photosynthesis during anthesis, delayed senescence, and optimized nitrogen and sugar balance. These findings demonstrate the differential impact of drought timing and severity on wheat development and yield, highlighting the importance of precise water management during critical growth stages. </p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigating the Impact of Drought During Returning Green and Jointing Stages on Different Tillers Position of Winter Wheat

  • 期刊论文

  • 发表日期：

    2025年6月28日

查看全文
  • Muhammad Fraz Ali,
  • Ping Li,
  • Lijuan Ma,
  • Changjie Feng,
  • Shubo Gu,
  • Xiang Lin,
  • Dong Wang

摘要

The transition from returning green to the jointing stage is critical for wheat architecture and yield. The water conditions during this period will significantly impact the tillers stability, physiological characteristics and grain yield. The current study aimed that drought at an earlier crop growth stage can enhance the crop potential to tolerate the subsequent drought stress by triggering a faster and stronger defense mechanism. To determine the effect of drought before and after jointing on the physiological characteristics of tiller development and spike formation at different tillering positions, this two-year pot experiment investigated the impact of varying drought stress levels during the returning greening and jointing stages in two winter wheat varieties i.e., “Shannong 29” (SN29) and “Heng 0628” (H0628). We subjected plants to nine water treatments, including mild and severe drought, and assessed tiller numbers, spike rates, physiological parameters (SOD, MDA, net photosynthesis, soluble protein, total nitrogen, sugar-to-nitrogen ratio), and yield. Results showed that drought significantly impacted tillers than the main stem, particularly during the jointing. Mild drought after returning green reduced tiller numbers but increased spike rates. Severe and prolonged drought decreased the spike rate of III, Ip, and IV tillers in both varieties. Mild drought increased SOD activity and MDA content, reduced net photosynthesis, and altered nitrogen and sugar ratios, with rehydration promoting recovery. Short-term mild drought at returning green and jointing increased yield, while severe and prolonged mild drought decreased it. The increased yield per spike under mild drought was associated with enhanced spike yield, maintained tillering in lower tillers, improved photosynthesis during anthesis, delayed senescence, and optimized nitrogen and sugar balance. These findings demonstrate the differential impact of drought timing and severity on wheat development and yield, highlighting the importance of precise water management during critical growth stages.