[Effects of different nitrogen application rate on allocation of photosynthetic electron flux in Rumex K-1 leaves].

植物生理与分子生物学学报 Pub Date : 2007-10-01
Hai-Dong Li, Hui-Yuan Gao
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Abstract

The total photosynthetic electron flux through PSII [J(e) (PSII)], the electron flux used for carbon assimilation [J(e) (PCR)], the electron flux used for photorespiration [J(e) (PCO)], the electron flux used for Mehler reaction [J(a) (O(2)-depend)] and the electron flux used for nitrogen metabolism [J(a) (O(2)-independ)] in leaves of Rumex K-1, a fodder crop with high protein content, were measured under three levels of nitrogen application (Fig.2). The nitrate reductase (NR) activity, glutamine synthetase (GS) activity, the leaf protein content, the chlorophyll content, P(n) and Phi (PSII) and F(v)/F(m) (Table 1) were also measured. The results showed that with the increase of nitrogen application, the NR and GS activities increased remarkably (Fig.3) and more electron flux was allocated to nitrogen metabolism as well as photorespiration (Fig.2). Nitrogen metabolism and carbon metabolism competed for energy, and the proportion of energy used in nitrogen metabolism to that used in carbon metabolism changed with nitrogen application rate. The electron flux used for nitrogen metabolism is about 15%-21% of the total electron flux under the three levels of nitrogen application (NO(3)(-) 0-30 mmol/L). Under lower nitrogen application, though energy used for carbon and nitrogen assimilation remarkably decreased, no significant increase of electron flux allocated to Mehler reaction was observed. The excess excitation energy in the leaves under the lower nitrogen application was efficiently dissipated via other energy dissipation mechanisms to protect the leaves against photo-damage.

[不同施氮量对柽柳K-1叶片光合电子通量分配的影响]。
测定了高蛋白饲料作物Rumex K-1叶片通过PSII的总光合电子通量[J(e) (PSII)]、用于碳同化的电子通量[J(e) (PCR)]、用于光呼吸的电子通量[J(e) (PCO)]、用于Mehler反应的电子通量[J(a) (O(2)依赖)]和用于氮代谢的电子通量[J(a) (O(2)独立)](图2)。测定了硝酸还原酶(NR)活性、谷氨酰胺合成酶(GS)活性、叶片蛋白质含量、叶绿素含量、P(n)、Phi (PSII)和F(v)/F(m)(表1)。结果表明,随着施氮量的增加,NR和GS活性显著增加(图3),更多的电子通量被分配给氮代谢和光呼吸(图2)。氮代谢与碳代谢相互竞争,氮代谢能量与碳代谢能量的比例随施氮量的增加而变化。3个施氮水平(NO(3)(-) 0 ~ 30 mmol/L)下,用于氮代谢的电子通量约占总电子通量的15% ~ 21%。在低施氮条件下,虽然碳氮同化的能量显著减少,但分配给Mehler反应的电子通量没有显著增加。低施氮条件下叶片中多余的激发能通过其他能量耗散机制有效耗散,保护叶片免受光损伤。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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