Allocation of nitrogen to cell walls decreases photosynthetic nitrogen-use efficiency
Allocation of nitrogen to cell walls decreases photosynthetic nitrogen-use efficiency
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DOI：
10.1111/j.0269-8463.2004.00847.x
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发表时间：
2004-06-01
影响因子：
5.2
通讯作者：
Hirose, T
中科院分区：
文献类型：
--
作者：
Onoda, Y;Hikosaka, K;Hirose, T
1. 氮(N)是植物生长必需的限制性资源，有效利用氮可以提高植物的适应性。研究了虎杖（Polygonum cuspidatum Sieb）光合氮利用效率（单位氮的光合能力）与氮分配给Rubisco和细胞壁的关系。调查。在5月（早发芽者）和8月（晚发芽者）发芽。早、晚萌发者光合能力随叶片单位面积氮含量的变化有显著差异。后期萌发者光合氮利用效率较高，主要是由于氮素分配给rubisco较多所致。后期萌发者细胞壁的氮分配较少。萌发后期较短的生长期与较高的光合能力有关，这是通过牺牲细胞壁将更多的氮分配给光合蛋白来实现的。氮分配给光合作用和结构组织之间的权衡表明，植物改变氮分配以增加碳同化的速度或持续时间。这种塑料变化将有助于植物自我维持并应对环境变化。
1. Nitrogen (N) is an essential limiting resource for plant growth, and its efficient use may increase fitness. We investigated photosynthetic N-use efficiency (photosynthetic capacity per unit N) in relation to N allocation to Rubisco and to cell walls in Polygonum cuspidatum Sieb. et Zucc. which germinated in May (early germinators) and August (late germinators).2. There was a significant difference between early and late germinators in photosynthetic capacity as a function of leaf N content per unit area. Higher photosynthetic N-use efficiency in late germinators was caused primarily by a larger allocation of N to Rubisco.3. Nitrogen allocation to cell walls was smaller in late germinators. The shorter growth period in late germinators was associated with higher photosynthetic capacity, which was achieved by allocating more N to photosynthetic proteins at the expense of cell walls.4. The trade-off between N allocation to photosynthesis and to structural tissues suggests that plants change N allocation to increase either the rate or duration of carbon assimilation. Such plastic change would help plants maintain themselves and cope with environmental changes.