Hydroscapes, hydroscape plasticity, and relationships to functional traits and mesophyll photosynthetic sensitivity to leaf water potential in Eucalyptus species

编号 040035002

推送时间 20220704

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Hydroscapes, hydroscape plasticity, and relationships to functional traits and mesophyll photosynthetic sensitivity to leaf water potential in Eucalyptus species

来源期刊 Plant, cell & environment

期 第350期

发表时间 20220615

关键词 anisohydry;  drought;  hydraulic conductance;  isohydry;  non-stomatal
limitation;  photosynthesis;  plasticity;  stomatal regulation;  water relations.; 

摘要 The isohydric-anisohydric continuum describes the relative stringency of stomatal control of leaf water potential (ψleaf) during drought. Hydroscape area (HA) – the water potential landscape over which stomata regulate ψleaf – has emerged as a useful metric of the iso/anisohydric continuum because it is strongly linked to several hydraulic, photosynthetic, and structural traits. Previous research on HA focused on broad ecological patterns involving several plant clades. Here we investigate relationships of HA to climatic conditions and functional traits across ecologically diverse but closely related species while accounting for phylogeny. Across a macroclimatic moisture gradient, defined by the ratio of mean annual precipitation to mean annual pan evaporation (P/Ep), HA decreased with P/Ep for ten Eucalyptus species. Greater anisohydry reflects lower turgor loss points and greater hydraulic safety, mirroring global patterns. More isohydric species have mesophyll photosynthetic capacity that is more sensitive to ψleaf, consistent with an earlier model for optimal stomatal behavior. Hydroscapes exhibit little plasticity in response to variation in water supply, and the extent of plasticity does not vary with P/Ep of native habitats. These findings strengthen the case that HA is a useful metric for characterizing drought tolerance and water-status regulation.

服务人员 孙小满

服务院士 尹伟伦

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