黄酮醇不会影响绿色或衰老桦树叶片中的蚜虫数量,但会导致光系统 II 功能下降。

IF 1.8 4区 生物学 Q3 BIOLOGY
Biology Open Pub Date : 2024-07-15 Epub Date: 2024-07-02 DOI:10.1242/bio.060325
Heta Mattila, Sergey Khorobrykh, Esa Tyystjärvi
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引用次数: 0

摘要

桦树在秋季衰老期合成的不是红色花青素,而是无色(人眼可见)、吸收紫外线的黄酮醇。为了测试黄酮醇是否能抵御昆虫,以及黄酮醇含量高或低的叶片在光合作用功能上是否存在差异,研究人员从室外生长的桦树上采集了无蚜虫和有蚜虫的绿叶和衰老的桦树叶片,并对其进行了分析。叶片叶绿素含量(即衰老阶段)对光合作用参数有很大影响。光化学淬灭和有功能的光系统 I 的数量随叶绿素含量呈线性下降,而 FV/FM(光系统 II 的功能)只有在衰老末期才会强烈下降。激发能量的非光化学淬灭(NPQ)在衰老末期有所增加。然而,无蚜虫和受蚜虫侵染的叶片在黄酮醇总量和单个黄酮醇种类上都没有发现明显差异,这表明黄酮醇在抵御蚜虫草食方面没有发挥作用。有趣的是,黄酮醇含量高的绿叶和衰老叶的 FV/FM 值都很低。高含量的黄酮醇减缓了PSII的光抑制作用,并改善了恢复状况,但这只适用于绿叶。以前,我们曾提出花青素在秋季衰老的氮吸收阶段为光合作用提供了一个额外的汇,而本研究数据可能表明黄酮醇的合成也起着类似的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flavonols do not affect aphid load in green or senescing birch leaves but coincide with a decrease in Photosystem II functionality.

Instead of red anthocyanins, birches synthesise colourless (to human eye), UV-absorbing flavonols during autumn senescence. To test if flavonols protect against insects, and if leaves with high or low amounts of flavonols differ in their photosynthetic functions, aphid-free and aphid-infested green and senescing birch leaves were collected from outdoor-grown trees and analysed. Photosynthetic parameters were greatly affected by the leaf chlorophyll content (i.e. the phase of senescence). Photochemical quenching and the amount of functional Photosystem I decreased linearly with chlorophyll content, while FV/FM (Photosystem II functionality) decreased strongly only at the end of senescence. Non-photochemical quenching of excitation energy (NPQ) increased towards the end of senescence. However, no significant differences in the total flavonol amounts, nor in individual flavonol species, were found between aphid-free and aphid-infested leaves, suggesting that flavonols play no role in defence against aphid herbivory. Interestingly, both green and senescing leaves with a high flavonol content showed low FV/FM values. High flavonol content slowed down PSII photoinhibition and improved recovery, but only in green leaves. Previously, we proposed that anthocyanins provide an additional sink for photosynthates at the nitrogen resorption phase during autumn senescence, and the present data may suggest that flavonol synthesis plays a similar role.

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来源期刊
Biology Open
Biology Open BIOLOGY-
CiteScore
3.90
自引率
0.00%
发文量
162
审稿时长
8 weeks
期刊介绍: Biology Open (BiO) is an online Open Access journal that publishes peer-reviewed original research across all aspects of the biological sciences. BiO aims to provide rapid publication for scientifically sound observations and valid conclusions, without a requirement for perceived impact.
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