Elevated CO2 and temperature have different effects on leaf anatomy of perennial ryegrass in spring and summer
Elevated CO2 and temperature have different effects on leaf anatomy of perennial ryegrass in spring and summer
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DOI：
10.1006/anbo.1996.0146
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发表时间：
1996-10-01
期刊：
影响因子：
4.2
通讯作者：
Impens, I
中科院分区：
文献类型：
--
作者：
Ferris, R;Nijs, I;Impens, I
多年生黑麦草的成熟次叶。在春、夏两季再生期分别取样。研究了CO2浓度和气温升高对叶片不同位置和不同生长季节的气孔密度、气孔指数、保护细胞长度、表皮细胞密度、表皮细胞长度和叶肉细胞面积的影响。叶片气孔密度在CO2浓度升高的情况下春季较小，夏季较大，在温度升高和CO2 x温度升高的情况下，两个季节叶片气孔密度均高于对照。在春季，叶片气孔指数随CO2升高而降低，而在夏季，气孔指数随叶片位置的变化而变化。温度升高时，两个季节的气孔指数在叶尖/叶中部较低，而在叶基部略高。在较高的CO2温度下，气孔指数随叶片位置和季节的变化而变化。除CO2浓度升高（春季）和CO2 x温度升高（夏季）外，所有处理的叶表皮细胞密度均高于对照，叶基部细胞密度降低。在所有处理中，气孔密度和表皮细胞密度由叶尖向基部递减，而保卫细胞长度则呈反比关系，向基部递增。叶片表皮细胞长度和叶肉细胞面积春季随CO2升高而增大，夏季随CO2升高而减小。在CO2 x温度升高的情况下，叶片表皮细胞的长度在春季与对照相比没有变化，但在夏季有所减少。除夏季高CO2处理外，其余处理气孔导度均低于低CO2处理。这些解剖学上对二氧化碳和温度升高的不同反应提供了可能解释的信息。在相同条件下观察到的多年生l的季节叶面积发育差异。(C) 1996年植物学年鉴
Mature second leaves of Lolium perenne L. cv. Vigor, were sampled in a spring and summer regrowth period. Effects of CO2 enrichment and increased air temperature on stomatal density, stomatal index, guard cell length, epidermal cell density, epidermal cell length and mesophyll cell area were examined for different positions on the leaf and seasons of growth.Leaf stomatal density was smaller in spring but greater in summer in elevated CO2 and higher in both seasons in elevated temperature and in elevated CO2 x temperature relative to the respective controls. In spring, leaf stomatal index was reduced in elevated CO2 but in summer it varied with position on the leaf. In elevated temperature, stomatal index in both seasons was lower at the tip/middle of the leaf but slightly higher at the base. In elevated CO2 x temperature, stomatal index varied with position on the leaf and between seasons. Leaf epidermal cell density was higher in all treatments relative to controls except in elevated CO2 (spring) and elevated CO2 x temperature (summer), it was reduced at the leaf base. In all treatments, stomatal density and epidermal cell density declined from leaf tip to base, whilst guard cell length showed an inverse relationship, increasing towards the base. Leaf epidermal cell length and mesophyll cell area increased in elevated CO2 in spring and decreased in summer. In elevated CO2 x temperature leaf epidermal cell length remained unaltered in spring compared to the control but decreased in summer. Stomatal conductance was lower in all treatments except in summer in elevated CO2 it was higher than in the ambient CO2.These contrasting responses in anatomy to elevated CO2 and temperature provide information that might account. for differences in seasonal leaf area development observed in L. perenne under the same conditions. (C) 1996 Annals of Botany Company