Investigating plant morphological traits can provide insights into plant drought tolerance. To date, many papers have focused on plant hydraulic responses to drought during dehydration, but atmospheric water absorption by trichomes to mitigate drought stress by influencing leaf hydraulics in plant species that inhabit arid environments has been largely ignored. The experiment in this study was designed to assess how dew absorbed by leaf trichomes helps Caragana korshinskii withstand drought. The results showed that under a drought stress and dew (DS & D) treatment, C. korshinskii displayed a strong capacity to absorb dew with trichomes; exhibited slow decreases in leaf water potential (Ψleaf ), leaf hydraulic conductivity (Kleaf ), and gas exchange; experienced 50% Kleaf and gas exchange losses at lower relative soil water content levels than plants treated with drought stress and no dew (DS & ND); and experienced 50% Kleaf loss (Kleaf P50 ) at similar Ψleaf levels as DS & ND plants. Its congener C. sinica, which does not have leaf trichomes, displayed little ability to absorb dew under drought stress and did not show any remarkable improvement in the above parameters under the DS & D treatment. Our results indicated that leaf trichomes are important epidermal dew-uptake structures that assist in partially sustaining the leaf hydraulic assimilation system, mitigate the adverse effects of drought stress and contribute to the distribution of C. korshinskii in arid environments. This article is protected by copyright. All rights reserved.

中文翻译：

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锦鸡儿叶子毛状体吸收露水：在干旱环境中抵御干旱的替代水获取策略

研究植物形态特征可以深入了解植物的耐旱性。迄今为止，许多论文都关注脱水过程中植物对干旱的水力响应，但毛状体对大气吸水以通过影响栖息在干旱环境中的植物物种的叶片水力来减轻干旱胁迫的作用在很大程度上被忽视了。本研究中的实验旨在评估叶毛状体吸收的露水如何帮助 Caragana korshinskii 抵御干旱。结果表明，在干旱胁迫和露水(DS&D)处理下，科辛斯基毛状体表现出较强的吸收露水能力；表现出叶水势 (Ψleaf )、叶水力传导率 (Kleaf ) 和气体交换的缓慢下降；在相对土壤含水量较低的情况下，与干旱胁迫和无露水处理的植物相比，经历了 50% 的 Kleaf 和气体交换损失 (DS & ND)；并在与 DS 和 ND 植物相似的 Ψ叶水平下经历了 50% 的 Kleaf 损失（Kleaf P50）。其同源物C. sinica没有叶片毛状体，在干旱胁迫下吸收露水的能力很小，并且在DS＆D处理下上述参数没有表现出任何显着改善。我们的结果表明，叶毛状体是重要的表皮露水吸收结构，有助于部分维持叶水力同化系统，减轻干旱胁迫的不利影响，并有助于 C. korshinskii 在干旱环境中的分布。本文受版权保护。版权所有。