Growth, cell walls, and UDP-Glc dehydrogenase activity of Arabidopsis thaliana grown in elevated carbon dioxide
Growth, cell walls, and UDP-Glc dehydrogenase activity of Arabidopsis thaliana grown in elevated carbon dioxide
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DOI：
10.1078/0176-1617-00229
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发表时间：
2001-05-01
影响因子：
4.3
通讯作者：
Seemann, JR
中科院分区：
文献类型：
--
作者：
Gibeaut, DM;Cramer, GR;Seemann, JR
CO2浓度升高（1000 μ mol/mol）的影响进行了评估，对常见的杂草，拟南芥（兰茨贝格erecta），这是用作模式植物系统。CO2浓度升高刺激拟南芥的相对生长速率（RGR）和叶面积增益从子叶阶段开始，并持续通过少年阶段。这种早期的生长优势使植物生长在升高的CO2获得更多的DW，尽管类似的RGR在整个后期的发展阶段。在CO2浓度升高的条件下，叶片中DW的积累量越大，比叶面积（SLA）越低。然而，每单位叶面积的细胞壁投资的量，比“壁”面积（SWA），是类似的，表明CO2浓度升高并没有影响细胞碳的分布到细胞壁的叶片超出所需的细胞和叶片扩张。此外，细胞壁的组成随着时间的推移而变化，由于发展的变化，并不受CO2浓度升高。与升高的CO2引起的RGR增加相关的是UDP-Glc脱氢酶（E.C. 1.1.1.22），是许多细胞壁多糖生物合成所必需的核苷酸-糖互变途径中的关键酶。
The impact of elevated CO2 (1000 mu mol/mol) was assessed on the common weed, Arabidopsis thaliana (Landsberg erecta), which is used as a model plant system. Elevated CO2 stimulated relative growth rate (RGR) and leaf area gain of Arabidopsis beginning from the cotyledon stage and continuing through the juvenile stage. This early advantage in growth enabled the plants grown in elevated CO2 to gain more DW despite similar RGRs throughout the latter stages of development. The greater accumulation of DW in leaves grown in elevated CO2 resulted in a lower specific leaf area (SLA). However, the amount of cell wall investment per unit of leaf area, specific "wall" area (SWA), was similar indicating that elevated CO2 did not affect the distribution of cell carbon to the cell wall of leaves beyond that needed for cell and leaf expansion. Furthermore, cell wail composition changed with time due to developmental changes and was not affected by elevated CO2. Associated with the increase in RGR by elevated CO2 was a concomitant increase in the activity of UDP-Glc dehydrogenase (E.C. 1.1.1.22), a key enzyme in the nucleotide-sugar interconversion pathway necessary for biosynthesis of many cell-wall polysaccharides.