两种微环境下濒危物种 Lophophora diffusa（仙人掌科）在快速光照曲线前后的叶绿素荧光季节性变化

IF 1.7 4区生物学 Q3 ECOLOGY

Flora Pub Date : 2024-11-01 DOI:10.1016/j.flora.2024.152623

Claudia González-Salvatierra , Joel Flores , Omar Díaz-Segura , M. Loraine Matías-Palafox , Cecilia L. Jiménez-Sierra

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引用次数: 0

摘要

在沙漠环境中，强烈的光胁迫会严重阻碍植物的生长和存活，因此在哺育植物下形成的微环境至关重要。叶绿素 a 荧光是一种广泛使用的检测植物胁迫状况的工具。在这里，我们研究了仙人掌科植物Lophophora diffusa在护养植物下和阳光直射下的季节性生态生理表现。我们的评估包括监测一年中作为光合效率指标的叶绿素荧光参数，包括光系统 II 的有效量子产率（ΦPSII）、光系统 II 的最大量子效率（Fv/Fm）、电子传输速率（ETR）和非光化学淬灭（NPQ）。除冬季外，在所有季节都能观察到开放空间的日 PPFD 水平较高。此外，在春季和秋季，与裸露地点相比，哺育植物下的温度较低。裸冠菊表现出动态光抑制作用，这体现在春季暴露在阳光下的植株的 Fv/Fm 值低于遮蔽在防护植物下的植株。在快速光照曲线期间，在两种微环境中，衍生物仙人掌在冬季的最大ΦPSII值和最大ETR值均有所下降，而与春季被遮蔽在防护植物下的仙人掌相比，暴露在阳光下的仙人掌显示出更高的最大NPQ值。除冬季外，在这两种环境中的大多数季节都能观察到高饱和光照水平的 ETR，这表明仙人掌对高光照条件具有很强的耐受性。与自然条件相比，光照曲线会引起更大的压力，这一点可以从只有在快速光照曲线后才会出现 NPQ 增加的适应过程中得到证明。这些研究结果表明，扩散草的成年个体可能并不完全依赖护养植物生存，而是发展出了在不同微环境中茁壮成长的各种机制。

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Seasonal chlorophyll fluorescence before and after rapid light curves in the endangered species Lophophora diffusa (Cactaceae) across two microenvironments

In desert environments, intense light stress can significantly impede the growth and survival of plants, making microenvironments formed under nurse plants crucial. Chlorophyll a fluorescence serves as a widely employed tool for detecting plant stress conditions. Here, we investigated the seasonal ecophysiological performance of Lophophora diffusa (Cactaceae) under nurse plants and in direct sunlight. Our assessment involved monitoring chlorophyll fluorescence parameters as indicators of photosynthetic efficiency over the course of one year, including the effective quantum yield of photosystem II (Φ_PSII), maximum quantum efficiency of photosystem II (F_v/F_m), electron transport rate (ETR), and non-photochemical quenching (NPQ). Higher daily PPFD levels were observed in open spaces throughout all seasons except for winter. Additionally, temperatures were lower beneath nurse plants compared to exposed sites during spring and autumn. Lophophora diffusa exhibited dynamic photoinhibition, as evidenced by lower F_v/F_m values in plants exposed to sunlight compared to those sheltered under nurse plants in spring. During rapid light curves, L. diffusa exhibited decreased maximum Φ_PSII and maximum ETR values in winter across both microenvironments, while displaying higher maximum NPQ in cacti exposed to sunlight compared to those sheltered under nurse plants in spring. High saturating light levels for ETR were observed in both environments throughout most seasons, except for winter, indicating a high tolerance to high-light conditions. Light curves induced greater stress compared to natural conditions, as evidenced by the acclimation with increased NPQ observed only after rapid light curves. These findings suggest that adult individuals of L. diffusa may not strictly rely on nurse plants for survival and have developed various mechanisms to thrive in diverse microenvironments.

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来源期刊

Flora 生物-植物科学

CiteScore

3.30

自引率

10.50%

发文量

130

审稿时长

54 days

期刊介绍： FLORA publishes original contributions and review articles on plant structure (morphology and anatomy), plant distribution (incl. phylogeography) and plant functional ecology (ecophysiology, population ecology and population genetics, organismic interactions, community ecology, ecosystem ecology). Manuscripts (both original and review articles) on a single topic can be compiled in Special Issues, for which suggestions are welcome. FLORA, the scientific botanical journal with the longest uninterrupted publication sequence (since 1818), considers manuscripts in the above areas which appeal a broad scientific and international readership. Manuscripts focused on floristics and vegetation science will only be considered if they exceed the pure descriptive approach and have relevance for interpreting plant morphology, distribution or ecology. Manuscripts whose content is restricted to purely systematic and nomenclature matters, to geobotanical aspects of only local interest, to pure applications in agri-, horti- or silviculture and pharmacology, and experimental studies dealing exclusively with investigations at the cellular and subcellular level will not be accepted. Manuscripts dealing with comparative and evolutionary aspects of morphology, anatomy and development are welcome.