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<p>Lodging is a major issue affecting plant growth and productivity, yet its underlying mechanisms in woody plants remain poorly understood. In this study, a <i>Betula platyphylla</i> T-DNA insertion mutant exhibiting a lodging phenotype, designated <i>slim</i> (slender mutant), was identified and characterized. The plants used in this study propagated <b>through in vitro cultivation</b> from the original mutant line and maintained in a greenhouse. Morphological, histological, and omics analyses revealed that the <i>slim</i> mutant displayed precocious xylem development, suppressed secondary growth, and developmental defects in leaves and roots. The lodging phenotype became more pronounced with increasing plant height, and the mutant exhibited increased sensitivity to drought and cold stress when grown in pots under controlled conditions. Genomic resequencing identified four candidate genes near the T-DNA insertion site, including <i>BpAMPD</i> and <i>BPChr06G11030</i>, which may be involved in stem development and stress responses. This study provides valuable genetic resources for elucidating the molecular mechanisms underlying stem development in <i>Betula platyphylla</i>.</p>

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Morphological, histological, and transcriptome analysis of a lodging mutant in Betula platyphylla

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Yiran Wang,
  • Zelin Li,
  • Song Chen,
  • Jing Jiang,
  • Guifeng Liu,
  • Su Chen,
  • Haijiao Huang

摘要

Lodging is a major issue affecting plant growth and productivity, yet its underlying mechanisms in woody plants remain poorly understood. In this study, a Betula platyphylla T-DNA insertion mutant exhibiting a lodging phenotype, designated slim (slender mutant), was identified and characterized. The plants used in this study propagated through in vitro cultivation from the original mutant line and maintained in a greenhouse. Morphological, histological, and omics analyses revealed that the slim mutant displayed precocious xylem development, suppressed secondary growth, and developmental defects in leaves and roots. The lodging phenotype became more pronounced with increasing plant height, and the mutant exhibited increased sensitivity to drought and cold stress when grown in pots under controlled conditions. Genomic resequencing identified four candidate genes near the T-DNA insertion site, including BpAMPD and BPChr06G11030, which may be involved in stem development and stress responses. This study provides valuable genetic resources for elucidating the molecular mechanisms underlying stem development in Betula platyphylla.