{"title":"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","authors":"Shenglan Li, Shuangjiang Li, Evgenios Agathokleous, Guangyou Hao, Shenglei Wang, Zhaozhong Feng","doi":"10.1111/pce.14934","DOIUrl":null,"url":null,"abstract":"<p>Urban trees possess different capacities to mitigate ozone (O<sub>3</sub>) 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 O<sub>3</sub> resistance. We assessed gas exchange and hydraulic traits in three subtropical urban tree species, <i>Celtis sinensis</i>, <i>Quercus acutissima</i>, and <i>Q. nuttallii</i>, under nonfiltered ambient air (NF) and elevated O<sub>3</sub> (NF60). NF60 decreased photosynthetic rate (<i>A</i><sub>n</sub>) and stomatal conductance (<i>g</i><sub>s</sub>) only in <i>Q. acutissima</i> and <i>Q. nuttallii</i>. Maintained <i>A</i><sub>n</sub> in <i>C. sinensis</i> suggested high O<sub>3</sub> 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 <i>g</i><sub>s</sub> under NF60. Such stomatal dysfunction did not decrease intrinsic water use efficiency (WUE) due to a tight coupling of <i>A</i><sub>n</sub> and <i>g</i><sub>s</sub>. Conversely, <i>Q. acutissima</i> and <i>Q. nuttallii</i> showed maintained stomatal sensitivity and increased WUE, primarily correlated with <i>g</i><sub>s</sub> and leaf water relations, including relative water content and osmotic potential at turgor loss point. Our findings highlight a trade-off between O<sub>3</sub> resistance and stomatal functionality, with efficient stomatal control reducing the risk of hydraulic failure under combined stresses.</p>","PeriodicalId":222,"journal":{"name":"Plant, Cell & Environment","volume":"47 8","pages":"3166-3180"},"PeriodicalIF":6.3000,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Leaf water relations determine the trade-off between ozone resistance and stomatal functionality in urban tree species\",\"authors\":\"Shenglan Li, Shuangjiang Li, Evgenios Agathokleous, Guangyou Hao, Shenglei Wang, Zhaozhong Feng\",\"doi\":\"10.1111/pce.14934\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Urban trees possess different capacities to mitigate ozone (O<sub>3</sub>) 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 O<sub>3</sub> resistance. We assessed gas exchange and hydraulic traits in three subtropical urban tree species, <i>Celtis sinensis</i>, <i>Quercus acutissima</i>, and <i>Q. nuttallii</i>, under nonfiltered ambient air (NF) and elevated O<sub>3</sub> (NF60). NF60 decreased photosynthetic rate (<i>A</i><sub>n</sub>) and stomatal conductance (<i>g</i><sub>s</sub>) only in <i>Q. acutissima</i> and <i>Q. nuttallii</i>. Maintained <i>A</i><sub>n</sub> in <i>C. sinensis</i> suggested high O<sub>3</sub> 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 <i>g</i><sub>s</sub> under NF60. Such stomatal dysfunction did not decrease intrinsic water use efficiency (WUE) due to a tight coupling of <i>A</i><sub>n</sub> and <i>g</i><sub>s</sub>. Conversely, <i>Q. acutissima</i> and <i>Q. nuttallii</i> showed maintained stomatal sensitivity and increased WUE, primarily correlated with <i>g</i><sub>s</sub> and leaf water relations, including relative water content and osmotic potential at turgor loss point. Our findings highlight a trade-off between O<sub>3</sub> resistance and stomatal functionality, with efficient stomatal control reducing the risk of hydraulic failure under combined stresses.</p>\",\"PeriodicalId\":222,\"journal\":{\"name\":\"Plant, Cell & Environment\",\"volume\":\"47 8\",\"pages\":\"3166-3180\"},\"PeriodicalIF\":6.3000,\"publicationDate\":\"2024-05-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Plant, Cell & Environment\",\"FirstCategoryId\":\"2\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/pce.14934\",\"RegionNum\":1,\"RegionCategory\":\"生物学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PLANT SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plant, Cell & Environment","FirstCategoryId":"2","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/pce.14934","RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
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.
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.