ADAPTATION OF THE PHOTOSYNTHETIC APPARATUS IN MAIZE LEAVES AS A RESULT OF NITROGEN LIMITATION - RELATIONSHIPS BETWEEN ELECTRON-TRANSPORT AND CARBON ASSIMILATION
ADAPTATION OF THE PHOTOSYNTHETIC APPARATUS IN MAIZE LEAVES AS A RESULT OF NITROGEN LIMITATION - RELATIONSHIPS BETWEEN ELECTRON-TRANSPORT AND CARBON ASSIMILATION
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DOI：
10.1104/pp.94.3.1436
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发表时间：
1990-11-01
期刊：
影响因子：
7.4
通讯作者：
FOYER, C
中科院分区：
文献类型：
--
作者：
KHAMIS, S;LAMAZE, T;FOYER, C
在玉米（Zea maysL.，cv Contessa），氮（NO3−）限制导致地上部生长和光合能力降低，叶片玉米黄质含量增加。氮素亏缺对CO2同化的量子效率影响较小，但对光合作用的光饱和速率影响较大。在所有情况下，CO2同化的量子产率和光系统II光化学之间的线性关系持续存在。在高光照下，叶绿素a荧光的光化学猝灭和非光化学猝灭以及可变荧光与最大荧光的比值（Fv/Fm）的差异很大，氮缺乏植物和氮充足的控制之间是明显的，而在低光照下，这些参数在所有植物中是可比的。非光化学猝灭的光强度依赖性增加是最大的，在氮缺乏的植物是Fv/Fm比的下降。在缺氮植物中，光化学猝灭随辐照度的增加而降低，但在高辐照度下仍高于对照。热耗散过程被增强，作为一个结果，氮缺乏（非光化学淬灭升高，Fv/Fm降低）允许PSII保持相对氧化，即使当碳代谢是有限的，通过氮限制。
In maize (Zea maysL., cv Contessa), nitrogen (NO3−) limitation resulted in a reduction in shoot growth and photosynthetic capacity and in an increase in the leaf zeaxanthin contents. Nitrogen deficiency had only a small effect on the quantum yield of CO2assimilation but a large effect on the light-saturated rate of photosynthesis. Linear relationships persisted between the quantum yield of CO2assimilation and that of photosystem II photochemistry in all circumstances. At high irradiances, large differences in photochemical quenching and nonphotochemical quenching of Chl a fluorescence as well as the ratio of variable to maximal fluorescence (Fv/Fm) were apparent between nitrogen-deficient plants and nitrogen-replete controls, whereas at low irradiances these parameters were comparable in all plants. Light intensity-dependent increases in nonphotochemical quenching were greatest in nitrogen-deficient plants as were the decreases in Fv/Fm ratio. In nitrogen-deficient plants, photochemical quenching decreased with increasing irradiance but remained higher than in controls at high irradiances. Thermal dissipative processes were enhanced as a result of nitrogen deficiency (nonphotochemical quenching was elevated and Fv/Fm was lowered) allowing PSII to remain relatively oxidised even when carbon metabolism was limited via nitrogen limitation.