Ferris Rachel, Taylor Gail
School of Biological Sciences, University of Sussex, Falmer, Brighton, Sussex BN1 9QG, UK.
New Phytol. 1995 Dec;131(4):491-501. doi: 10.1111/j.1469-8137.1995.tb03086.x.
This study investigated the effects of carbon dioxide (CO) enrichment and soil water deficit on the water use efficiency (WUE) and growth of Sanguisorba minor Scop, (salad burnet I and Anthyllis vulneraria L. (kidney vetch), growing in controlled environments. Instantaneous WL E (IWUE) increased in both species in elevated CO , with a higher average increase in unwatered (UW) A. vulneraria over the drying cycle. Total plant WUE of A. vulneraria increased in elevated CO, and under water deficit: the UW plants in elevated CO., had higher WUE and reduced water loss. By contrast, thee was only an effect of water supply on S. minor: total plant WUE increased and water loss decreased in the UV plants in both CO , treatments. Total apparent root length (ARL) of both species increased with CO , enrichment and in UW S. minor total ARL was increased. By contrast, for A. vulneraria, total ARL of UV plants increased in ambient CO , but decreased in elevated CO as compared with well-watered (WW) plants. Shoot dry weight (SDW) and root dry weight increased in both species (WW and UW) with CO . enrichment. For UW S. minor, SDW decreased relative to WW plants in both CO treatments. By contrast, ANOVA showed no significant effect of water supply on SDW of A. vulneraria. Leafier length increased in both species in elevated CO , and decreased following drought. Cell wall tensiometric extensibility (%P) increased in expanding leaves of S. minor in elevated CO., and for both species %P decreased in the UW plants as compared with those WW. Leaf water potential (f) of both species was lower in growing leaves of WAV plants in elevated CO Water deficit reduced the Ψ of growing leaves in both CO , treatments. The different responses of these species suggest that in a drier, enriched CO , environment survival in a community might depend on their ability to maintain growth at the same time as conserving water.
本研究调查了在可控环境中，二氧化碳（CO₂）浓度升高和土壤水分亏缺对小地榆（Sanguisorba minor Scop，沙拉地榆）和 vulneraria L.（肾豆）的水分利用效率（WUE）及生长的影响。两种植物在 CO₂ 浓度升高时，瞬时水分利用效率（IWUE）均有所增加，在干燥周期中，未浇水的（UW）肾豆的平均增幅更高。肾豆的总植株水分利用效率在 CO₂ 浓度升高和水分亏缺条件下均有所增加：CO₂ 浓度升高环境中的 UW 植株具有更高的水分利用效率且水分损失减少。相比之下，水分供应仅对小地榆有影响：在两种 CO₂ 处理中，UW 植株的总植株水分利用效率均增加且水分损失减少。两种植物的总表观根长（ARL）均随 CO₂ 浓度升高而增加，UW 小地榆的总 ARL 增加。相比之下，对于肾豆，与充分浇水（WW）的植株相比，UV 植株的总 ARL 在环境 CO₂ 浓度下增加，但在 CO₂ 浓度升高时降低。两种植物（WW 和 UW）的地上部干重（SDW）和根部干重均随 CO₂ 浓度升高而增加。对于 UW 小地榆，在两种 CO₂ 处理中，其 SDW 相对于 WW 植株均降低。相比之下，方差分析表明水分供应对肾豆的 SDW 无显著影响。两种植物在 CO₂ 浓度升高时叶长增加，干旱后叶长减小。CO₂ 浓度升高时，小地榆展开叶的细胞壁张力伸长率（%P）增加，与 WW 植株相比，两种植物 UW 植株的 %P 均降低。两种植物在 CO₂ 浓度升高时生长叶的叶水势（Ψ）均较低。水分亏缺使两种 CO₂ 处理中生长叶的 Ψ 降低。这些物种的不同反应表明，在更干燥、CO₂ 浓度升高的环境中，群落中的生存可能取决于它们在节水的同时维持生长的能力。
