叶片水分关系决定了城市树种在抗臭氧能力和气孔功能之间的权衡

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Shenglan Li, Shuangjiang Li, Evgenios Agathokleous, Guangyou Hao, Shenglei Wang, Zhaozhong Feng
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引用次数: 0

摘要

城市树木通过气孔吸收臭氧(O3)污染的能力各不相同。气孔关闭可保护树木免受氧化损伤,但会限制其生长。迄今为止,还不清楚植物的水力功能如何影响气孔行为并决定抗臭氧能力。我们评估了三个亚热带城市树种--Celtis sinensis、Quercus acutissima 和 Q. nuttallii--在无过滤环境空气(NF)和高浓度 O3(NF60)条件下的气体交换和水力特征。NF60 只降低了 Q. acutissima 和 Q. nuttallii 的光合速率(An)和气孔导度(gs)。C. sinensis 的 An 维持在较高水平,表明其具有较强的抗 O3 能力,这归因于叶片在充分收缩时具有较高的电容。然而,该物种的气孔对蒸汽压力不足的敏感性降低,在 NF60 条件下最小 gs 增加。由于 An 和 gs 的紧密耦合,这种气孔功能障碍不会降低内在水分利用效率(WUE)。相反,Q. acutissima 和 Q. nuttallii 则保持了气孔敏感性并提高了水分利用效率,这主要与 gs 和叶片水分关系有关,包括相对含水量和失去水分时的渗透势。我们的研究结果突显了抗臭氧和气孔功能之间的权衡,高效的气孔控制降低了综合胁迫下水力衰竭的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Leaf water relations determine the trade-off between ozone resistance and stomatal functionality in urban tree species

Urban trees possess different capacities to mitigate ozone (O3) pollution through stomatal uptake. Stomatal closure protects trees from oxidative damage but limits their growth. To date, it is unclear how plant hydraulic function affect stomatal behaviour and determine O3 resistance. We assessed gas exchange and hydraulic traits in three subtropical urban tree species, Celtis sinensis, Quercus acutissima, and Q. nuttallii, under nonfiltered ambient air (NF) and elevated O3 (NF60). NF60 decreased photosynthetic rate (An) and stomatal conductance (gs) only in Q. acutissima and Q. nuttallii. Maintained An in C. sinensis suggested high O3 resistance and was attributed to higher leaf capacitance at the full turgor. However, this species exhibited a reduced stomatal sensitivity to vapour pressure deficit and an increased minimal gs under NF60. Such stomatal dysfunction did not decrease intrinsic water use efficiency (WUE) due to a tight coupling of An and gs. Conversely, Q. acutissima and Q. nuttallii showed maintained stomatal sensitivity and increased WUE, primarily correlated with gs and leaf water relations, including relative water content and osmotic potential at turgor loss point. Our findings highlight a trade-off between O3 resistance and stomatal functionality, with efficient stomatal control reducing the risk of hydraulic failure under combined stresses.

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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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