Ferris Rachel, Taylor Gail
School of Biological Sciences, University of Sussex, Falmer Brighton, Sussex BN1 9QG.
New Phytol. 1994 Jun;127(2):297-307. doi: 10.1111/j.1469-8137.1994.tb04280.x.
Diurnal measurements of leaf or leaflet, extension, water relations and cell wall extensibility (ø) were made on young growing leaves of four chalk downland herbs (Sanguisorba minor Scop., Lotus corniculatus L., Anthyllis vulneraria L. and Plantago media L.) growing in controlled environment cabinets and exposed to either ambient or elevated CO . This study revealed differences in that effect of CO and the- control of leaf growth between the four species. Leaf extension rate (LER) increased significantly at night (average over 8 h) in elevated C0 for S. minor A. vulneraria and P. Media with a significant increase over the first 4h of darkness for S. minor, L, corniculatus and P. media, whilst for S. minor and P. media average day-time LER (over 16 h) also increased significantly in elevated CO , as compared with ambient CO . Water potential (ψpS), solute potential (ψpS), turgor pressure (P), yield turgor (Y) and the effective turgor for growth (Pe) were measured using psychrometers. Bollrte potentials of s, minor, A. vulneraria and P. media decreased significantly following exposure to elevated co with a Significant reduction in ψpS, during the day in A. Vulneraria. Turgor pressure increased significantly in elevated CO as compared with ambient CO in A. vulneraria but there was no effect of elevated CO on P in the uther species. effects of CO on ψpS; or ψpS; were observed, Leaf cell wall extensibility (ø) increased significantly in leaves of V. minor, L. corniculatus and P. exposed to elevated Co . whereas in A. vulneraria, there was no effect of CO on extensibility. These results suggest that the mechanism by which elevated CO promotes leaf growth differs between species arisce in S. minor, L. corniculatus, and p media. CO through an influence on cell wall properties, whist in A vulneraria higher values of P explain that increased leaf growth in elevated CO for this species.
在可控环境箱中对四种生长于白垩质丘陵草原的草本植物（小地榆、百脉根、 vulneraria 地锦、大车前）的幼嫩生长叶片进行了叶片或小叶伸展、水分关系及细胞壁伸展性（ø）的昼夜测量，并使其暴露于环境 CO₂ 或升高的 CO₂ 环境中。本研究揭示了这四种植物在 CO₂ 效应及叶片生长控制方面的差异。小地榆、 vulneraria 地锦和大车前在升高的 CO₂ 环境中夜间（8 小时平均值）叶片伸展率（LER）显著增加，小地榆、百脉根和大车前在黑暗的前 4 小时增加显著，而对于小地榆和大车前，与环境 CO₂ 相比，升高的 CO₂ 环境中平均白天 LER（16 小时）也显著增加。使用湿度计测量了水势（ψpS）、溶质势（ψpS）、膨压（P）、屈服膨压（Y）和生长有效膨压（Pe）。小地榆、 vulneraria 地锦和大车前暴露于升高的 CO₂ 后，其水势显著降低，vulneraria 地锦在白天 ψpS 显著降低。与环境 CO₂ 相比，vulneraria 地锦在升高的 CO₂ 环境中膨压显著增加，但升高的 CO₂ 对其他物种的 P 没有影响。未观察到 CO₂ 对 ψpS 或 ψpS 的影响。暴露于升高的 CO₂ 的小地榆、百脉根和大车前叶片的细胞壁伸展性（ø）显著增加，而在 vulneraria 地锦中，CO₂ 对伸展性没有影响。这些结果表明，升高的 CO₂ 促进叶片生长的机制在不同物种间存在差异，在小地榆、百脉根和大车前中，CO₂ 通过影响细胞壁特性起作用，而在 vulneraria 地锦中，较高的 P 值解释了该物种在升高的 CO₂ 环境中叶生长增加的现象。
