Specification of adaxial and abaxial stomata, epidermal structure and photosynthesis to CO2 enrichment in maize leaves
Specification of adaxial and abaxial stomata, epidermal structure and photosynthesis to CO2 enrichment in maize leaves
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DOI：
10.1093/jxb/erj030
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发表时间：
2006-01-01
影响因子：
6.9
通讯作者：
Foyer, CH
中科院分区：
文献类型：
--
作者：
Driscoll, SP;Prins, A;Foyer, CH
在350或700 μ l（-1）CO2中生长至成熟的玉米植株中研究了CO2富集的适应性。与CO2富集生长的植物显着高于那些生长在350 μ l（-1）CO2，但他们有相同数量的叶子。高CO2浓度导致全叶叶绿素和蛋白质含量显著下降。在所有的生长条件下，近轴和远轴叶表面上的气孔的比例是相似的，但气孔指数显着增加，在700亩升（-1）CO2生长的植物。加倍大气中的CO2含量改变表皮细胞的大小，导致更少，更大的细胞在两个叶片表面。叶片的光合速率和蒸腾速率均是远轴面高于近轴面。CO2吸收速率增加大气CO2增加到两个叶片表面的生长浓度。高于这些值，CO2吸收的远轴表面上是稳定的或增加CO2浓度的增加。与此形成鲜明对比的是，在生长CO2值以上的浓度下，近轴面的CO2吸收率逐渐受到抑制，无论是直接向该面还是远轴面提供光。这些结果表明，玉米叶片通过改变表皮细胞数量而不是气孔数量来调节气孔密度。此外，近轴面上的光合作用的CO2响应曲线是具体由生长CO2丰度和轨道蒸腾。相反，光合作用的远轴面在很大程度上是独立的CO2浓度，而独立的气孔功能。
Acclimation to CO2 enrichment was studied in maize plants grown to maturity in either 350 or 700 mu l l(-1) CO2. Plants grown with CO2 enrichment were significantly taller than those grown at 350 mu l l(-1) CO2 but they had the same number of leaves. High CO2 concentration led to a marked decrease in whole leaf chlorophyll and protein. The ratio of stomata on the adaxial and abaxial leaf surfaces was similar in all growth conditions, but the stomatal index was considerably increased in plants grown at 700 mu l l(-1) CO2. Doubling the atmospheric CO2 content altered epidermal cell size leading to fewer, much larger cells on both leaf surfaces. The photosynthesis and transpiration rates were always higher on the abaxial surface than the adaxial surface. CO2 uptake rates increased as atmospheric CO2 was increased up to the growth concentrations on both leaf surfaces. Above these values, CO2 uptake on the abaxial surface was either stable or increased as CO2 concentration increased. In marked contrast, CO2 uptake rates on the adaxial surface were progressively inhibited at concentrations above the growth CO2 value, whether light was supplied directly to this or the abaxial surface. These results show that maize leaves adjust their stomatal densities through changes in epidermal cell numbers rather than stomatal numbers. Moreover, the CO2-response curve of photosynthesis on the adaxial surface is specifically determined by growth CO2 abundance and tracks transpiration. Conversely, photosynthesis on the abaxial surface is largely independent of CO2 concentration and rather independent of stomatal function.