Physiological changes during heartwood formation induced by plant growth regulators in Dalbergia odorifera (Leguminosae)
Physiological changes during heartwood formation induced by plant growth regulators in Dalbergia odorifera (Leguminosae)
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DOI：
10.1163/22941932-bja10052
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发表时间：
2021-07-01
期刊：
影响因子：
1.9
通讯作者：
Hong, Zhou
中科院分区：
文献类型：
--
作者：
Cui, Zhiyi;Li, Xiaofei;Hong, Zhou
有必要更好地了解和促进香檀这一极具价值的心材的形成。植物生长调节剂是应用最广泛、通常最有效的心材形成促进剂。然而，到目前为止，还没有一种方法被证明是有效的，因为对心材发育过程中的生化和生理变化知之甚少。四种潜在的心材诱导物质，即。将乙烯利、茉莉酸甲酯、水杨酸和脱落酸溶液注入观赏木的树干，研究其对心材形成及相关生理反应的影响。在后处理期间对非结构性碳水化合物、木材性质、精油以及组织化学和结构观察进行了评估。在天然心材的形成过程中也观察到，生长调节剂诱导的江香产生伴随着边材脱水、非结构性碳水化合物的消耗和心材特有物质的合成。这些物质在射线和轴向薄壁组织中合成，然后通过维管束运输到维管束中。随着心材物质的积累，基本密度和精油含量逐渐增加，最终形成姜香。在这个过程中，变色边材的生理参数逐渐进化为接近天然心材的生理参数。以乙烯利为诱导剂的诱变效果最接近天然心材，其密度、精油含量、成分和相对含量均达到优质江香的标准，而其他诱导剂的诱变效果不理想。本研究支持乙烯利可用于诱导香茅香形成的假说。
There is a need to better understand and promote formation of 'Jiang Xiang', the highly valuable heartwood of Dalbergia odorifera T. Chen. Plant growth regulators are the most widely used and generally most effective promoters of heartwood formation. However, to date no method has been proved effective for D. odorifera as little is known about biochemical and physiological change during heartwood development. Four potential heartwood induction substances viz. ethephon, methyl jasmonate, salicylic acid and abscisic acid solutions were injected into the trunk of D. odorifera to determine the effect on heartwood formation and related physiological responses. Non-structural carbohydrates, wood properties, essential oil and histochemical and structural observation were assessed in the posttreatment period. As also observed in the formation of natural heartwood, growth regulator-induced Jiang Xiang production was accompanied by sapwood dehydration, non-structural carbohydrates consumption and synthesis of heartwood specific substances. These substances were synthesized in the ray and axial parenchyma and than transported into the vessels through the pits. As the heartwood substances accumulated, basic density and essential oil content increased gradually, thereby Jiang Xiang was finally produced. In this process, physiological parameters of discoloured sapwood gradually evolved to resemble those of natural heartwood. Ethephon-induced Jiang Xiang was closest to natural heartwood and its density, essential oil content, composition and relative amounts met the standards for high-quality Jiang Xiang, while the other inducers had unsatisfactory induction effects. This study supports the hypothesis that ethephon could be applied to induce formation of Jiang Xiang in D. odorifera.