CHANGES IN PHOTOSYNTHESIS, CARBON BUDGET AND MINERAL-CONTENT DURING THE GROWTH OF THE 1ST LEAF OF CUCUMBER
CHANGES IN PHOTOSYNTHESIS, CARBON BUDGET AND MINERAL-CONTENT DURING THE GROWTH OF THE 1ST LEAF OF CUCUMBER
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DOI：
10.1093/oxfordjournals.aob.a086778
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发表时间：
1984-01-01
期刊：
影响因子：
4.2
通讯作者：
WITHERS, AC
中科院分区：
文献类型：
--
作者：
HO, LC;HURD, RG;WITHERS, AC
研究了黄瓜第一片真叶发育过程中光合作用与干物质积累和运转的关系。叶片在20 °C和2 g m− 3CO2条件下，在50 W m− 2光合有效辐射的辐照下生长10 h− 1。以叶面积为基础的最大净光合速率发生在完全展开时。基于入射辐射的光化学效率也增加到这个阶段，并且与叶子中叶绿素的浓度有关。暗呼吸和光补偿点在整个叶片展开过程中呈下降趋势，碳收支分析表明，叶片碳积累速率在展开70%时达到峰值。当叶子膨胀了30%左右时，它就从一个碳的净进口者变成了一个碳的净出口者。出口率增加与叶片扩张（净光合作用），并在白天的两倍高，在夜间在充分扩展。在叶片完全展开时，一夜之间损失的淀粉量减少，输出的碳占每日固定净碳的80%。
The relationships between photosynthesis, dry matter accumulation and translocation have been studied during the development of the first true leaf of cucumber. The leaf was grown in an irradiance of 50W m−2photosynthetically active radiation for 10 h−1at 20 °C and 2 g m−3CO2.The maximum rate of net photosynthesis, on a leaf area basis, occured at full expansion. Photochemical efficiency, based on incident radiation, also increased up to this stage and was related to the concentration of chlorophyll in the leaf. Dark respiration and the light compensation point fell over the whole period of leaf expansion.A carbon budget analysis showed that the rate of carbon accumulation in the leaf reached a peak at 70 percent expansion. The leaf changed from a net importer to a net exporter of carbon when it was about 30 percent expanded. The rate of export increased with leaf expansion (and with net photosynthesis) and was twice as high in the day an in the night at full expansion. At full leaf expansion there was a reduction in the amount of starch lost overnight, and the carbon exported amounted to 80 per cent of the daily net carbon fixed.