Locally biosynthesized gibberellins in Populus stems are involved in the regulation of wood development.

Forestry research Pub Date : 2025-02-27 eCollection Date: 2025-01-01 DOI:10.48130/forres-0025-0005
Huili Su, Chunyang Wan, Xiaokang Fu, Jian Hu, Yuanxun Tao, Keming Luo, Changzheng Xu
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Abstract

Gibberellins (GAs) are a class of hormonal regulators, which influence various developmental processes in the life cycle of plants. In woody species, bioactive GAs, whose precursors are synthesized by the action of terpene cyclases and carried in the phloem by long-distance translocation from aerial shoot apex and leaves, are known to be a mobile signal to modulate stem growth. However, little is known about the existence and role of local GA synthesis in stems. Here we provide multiple lines of evidence suggesting the presence of local de novo GA biosynthesis in poplar stems and assess its role in wood development. First, the application of a GA biosynthetic inhibitor to decapitated poplar led to a significant reduction in local GA accumulation in the stem. Second, the correlated expression patterns of GA biosynthetic genes across radial tissues showed the existence of local GA production in the stem. Third, bioactive GA assays in transgenic poplar lines expressing Arabidopsis CPS, which encodes the first enzyme in the GA biosynthetic pathway, further confirmed the occurrence of local GA biosynthesis in the bark and cambial zones, but not in the xylem. Finally, modified local GA biosynthesis in the stem revealed its positive effects on secondary growth during wood formation. Taken together, our results demonstrate the existence of local de novo biosynthesis of GAs in poplar stems that contributes to the regulation of wood development via stimulating cambial activity.

杨树茎中局部生物合成的赤霉素参与了木材发育的调控。
赤霉素(giberellins, GAs)是一类激素调节剂,影响植物生命周期中的各种发育过程。在木本植物中,生物活性气体是一种调节茎生长的移动信号,其前体由萜烯环化酶合成,并通过空中茎尖和叶片的远距离转运在韧皮部中携带。然而,对茎中局部GA合成的存在及其作用知之甚少。在这里,我们提供了多条证据,表明白杨茎中存在局部新生GA生物合成,并评估了其在木材发育中的作用。首先,在无头杨树上施用一种GA生物合成抑制剂,可显著降低树干局部GA积累量。其次,GA生物合成基因在径向组织中的相关表达模式表明,茎中存在局部GA生产。第三,对编码GA生物合成途径第一酶的拟南芥CPS转基因杨树品系进行GA生物活性测定,进一步证实了在树皮和形成层区存在局部GA生物合成,而在木质部不存在。最后,改良的GA生物合成对木材形成过程中的次生生长有积极的影响。综上所述,我们的研究结果表明,杨树茎中存在局部新生生物合成气体,通过刺激形成层活性来调节木材发育。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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