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<p>Primary leaves play a crucial role in the early establishment of seedlings. Unlike mature leaves, where senescence occurs after their functional phase, senescence of primary leaves in young monocots with non-photosynthetic cotyledons may serve an essential role in seedling vigour. In this study, we have investigated the possible role of two cell wall hydrolases (β-galactosidase and β-glucosidase) to provide respiratory sugar by cell wall catabolism during senescence phase of primary wheat leaves. We measured oxygen evolution, chlorophyll content, and the activity of cell wall hydrolases in mature, partially senescent and senescent leaves. Chlorophyll content and rate of oxygen evolution decline continuously with the progress of senescence with maximum decline by 72% and 78%, respectively in senescent leaves. Conversely, the activity of β-galactosidase and β-glucosidase increased, and in the cell wall bound fraction of senescent leaves it increased markedly by 132% and 167%, respectively. These findings suggest that enhanced cell wall degradation provides respiratory sugars to support the energy-driven senescence program, thereby contributing to efficient seedling establishment and vigour.</p>

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Enhanced Cell Wall Hydrolases Activities in Senescing Primary Leaves of Wheat Seedlings and Their Possible Role in Seedling Vigour

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Jitendra Kumar Pandey,
  • Chinmayee Acharya,
  • Sandeep Kumar Chaurasia,
  • Mayank Singh,
  • Deepak Kumar Saini,
  • R. P. Singh,
  • Shivali Rathore,
  • Ashutosh Tripathi,
  • Basanti Biswal

摘要

Primary leaves play a crucial role in the early establishment of seedlings. Unlike mature leaves, where senescence occurs after their functional phase, senescence of primary leaves in young monocots with non-photosynthetic cotyledons may serve an essential role in seedling vigour. In this study, we have investigated the possible role of two cell wall hydrolases (β-galactosidase and β-glucosidase) to provide respiratory sugar by cell wall catabolism during senescence phase of primary wheat leaves. We measured oxygen evolution, chlorophyll content, and the activity of cell wall hydrolases in mature, partially senescent and senescent leaves. Chlorophyll content and rate of oxygen evolution decline continuously with the progress of senescence with maximum decline by 72% and 78%, respectively in senescent leaves. Conversely, the activity of β-galactosidase and β-glucosidase increased, and in the cell wall bound fraction of senescent leaves it increased markedly by 132% and 167%, respectively. These findings suggest that enhanced cell wall degradation provides respiratory sugars to support the energy-driven senescence program, thereby contributing to efficient seedling establishment and vigour.