Drought could promote the heartwood formation in Dalbergia odorifera by enhancing the transformation of starch to soluble sugars
Drought could promote the heartwood formation in Dalbergia odorifera by enhancing the transformation of starch to soluble sugars
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DOI：
10.1080/02827581.2021.2009022
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发表时间：
2021-12-03
影响因子：
1.8
通讯作者：
Li, Xiaofei
中科院分区：
文献类型：
--
作者：
Cui, Zhiyi;Yang, Zengjiang;Li, Xiaofei
黄檀（Dalbergia odorifera T. Chen）的心材具有很高的价值。推测干旱可能促进了香桐心材的形成。为了验证这一假设，我们人工模拟了土壤含水量低和土壤含水量高的条件，并研究了生活在不同土壤水分条件下的香木树是否表现出不同的心材形成。此外，我们还从非结构性碳水化合物（non-structural carbohydrate， NSC）的角度，初步探讨了干旱影响降香草心材形成的可能机制。干旱处理的树木的心材形成率和心材大小较高。干旱处理的心材密度显著大于对照，重度干旱处理的心材含油量显著高于其他处理。各水处理对心材精油成分均无显著影响。此外，水处理对NSC总量的影响非常有限；然而，与对照相比，干旱处理促进了淀粉向可溶性糖的转化。本研究证实了干旱促进降香草心材形成的假设，干旱促进降香草心材形成不是通过改变NSC总量，而是通过改变NSC成分比例。
The heartwood of Dalbergia odorifera T. Chen (D. odorifera) is highly valuable. It was speculated that drought could promote heartwood formation in D. odorifera. To test this hypothesis, we artificially simulated conditions of low and high soil moisture content and investigated whether D. odorifera trees living in habitats with contrasting soil water conditions display distinct heartwood formation. Besides, we performed a preliminary study to explore the possible mechanism of drought affecting heartwood formation in D. odorifera in terms of non-structural carbohydrates (NSC). Higher heartwood formation percentage and heartwood size were observed in drought-treated trees. The heartwood density of drought-treated trees was significantly greater than that of control and the oil content of heavy drought-treated heartwood was significantly higher than that of the other treatments. None of water treatments had a significant effect on the essential oil components of heartwood. Furthermore, the effects of water treatments on the total amount of NSC were very limited; however drought treatments enhanced the transformation of starch to soluble sugars compared to control. This study confirmed the hypothesis that drought could promote the heartwood formation in D. odorifera, not by changing the total amount of NSC but by changing the component proportion of NSC.