Scholarlink

<p>Exogenous sucrose is frequently used to explore carbon–signalling interactions during secondary growth, but its direct effects on conifer stems remain poorly resolved. This study involved the application of sucrose at concentrations of 0%, 1%, 5%, and 10% (w/w) to the girdled stem windows of ten-year-old Taxodium hybrid ‘Zhongshanshan’, with subsequent assessment of the secondary phloem, cambial zone, and current-year xylem. Sucrose supply widened the conducting phloem in a dose-dependent manner, with a 26% increase at 10%, while the canonical PF–Se–PP–Se–PF cell sequence was preserved. Callose deposition doubled under high sucrose. Cambial activity showed opposite trends: 1% sucrose expanded cell layers, whereas 5–10% reduced them and disturbed radial alignment. Xylogenesis was suppressed at higher concentrations, as tracheid production declined by up to 53%, accompanied by cell-wall thickening and lumen contraction. These results demonstrate sucrose’s dual role as both a carbon substrate and a signalling regulator. Moderate doses stimulate phloem and cambial growth, whereas excess sucrose restricts xylem formation and limits secondary growth in this hybrid cypress.</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

The effect of exogenous sucrose on the anatomical structure of secondary tissues in Taxodium hybrid ‘Zhongshanshan’

  • 期刊论文

  • 发表日期：

    2026年6月16日

查看全文
  • Shaofei Xing,
  • Haizhe Zhang,
  • Biao Pan,
  • Jiangtao Shi

摘要

Exogenous sucrose is frequently used to explore carbon–signalling interactions during secondary growth, but its direct effects on conifer stems remain poorly resolved. This study involved the application of sucrose at concentrations of 0%, 1%, 5%, and 10% (w/w) to the girdled stem windows of ten-year-old Taxodium hybrid ‘Zhongshanshan’, with subsequent assessment of the secondary phloem, cambial zone, and current-year xylem. Sucrose supply widened the conducting phloem in a dose-dependent manner, with a 26% increase at 10%, while the canonical PF–Se–PP–Se–PF cell sequence was preserved. Callose deposition doubled under high sucrose. Cambial activity showed opposite trends: 1% sucrose expanded cell layers, whereas 5–10% reduced them and disturbed radial alignment. Xylogenesis was suppressed at higher concentrations, as tracheid production declined by up to 53%, accompanied by cell-wall thickening and lumen contraction. These results demonstrate sucrose’s dual role as both a carbon substrate and a signalling regulator. Moderate doses stimulate phloem and cambial growth, whereas excess sucrose restricts xylem formation and limits secondary growth in this hybrid cypress.