Comparison of Susceptibility to Photoinhibition and Energy Partitioning of Absorbed Light in Photosystem II in Flag Leaves of Two Rice (Oryza sativa L.) Cultivars that Differ in Their Responses to Nitrogen-Deficiency
Comparison of Susceptibility to Photoinhibition and Energy Partitioning of Absorbed Light in Photosystem II in Flag Leaves of Two Rice (Oryza sativa L.) Cultivars that Differ in Their Responses to Nitrogen-Deficiency
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不同缺氮反应的两个水稻品种剑叶光抑制敏感性及光系统II吸收光能量分配的比较
DOI：
10.1626/pps.13.11
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发表时间：
2010
影响因子：
2.5
通讯作者：
O. Ueno
中科院分区：
文献类型：
--
作者：
E. Kumagai;T. Araki;O. Ueno
摘要摘要：在标准氮（SN）和低氮（LN）条件下，研究了两个水稻品种白别（Shirobeniya）和赤之星（Akenohoshi）剑叶光系统II（PSII）的能量分配和PSII对光抑制的敏感性。缺氮导致两品种旗叶总干重、净光合速率（Pn）、羧化能通量（Jc）和核酮糖-1，5-二磷酸羧化酶/加氧酶（Rubisco）含量显著下降，且白变谷在LN处理下的上述指标均低于明之星。在两个品种中，通过交替电子流的能量通量显着增加缺氮，这是伴随着增强超氧化物歧化酶（SOD）活性。虽然在LN条件下，没有品种差异，发现在Ja和SOD，抗坏血酸过氧化物酶活性在白谷低于明之星。缺N处理后，光抑制敏感性（PSII最大量子产率的降低程度）、过氧化氢（H2 O2）含量和丙二醛（MDA）含量均显著高于赤之星处理。这些结果表明，增加的光抑制的敏感性在LN植物的Shirobeniya主要是由于叶绿体的氧化损伤，导致较低的羧化和H2 O2-清除能力。因此，羧化和H2 O2-清除能力可能是决定水稻品种间LN条件下生产力差异的重要因素。
Abstract Abstract: The energy partitioning in photosystem II (PSII) and the susceptibility to photoinhibition in PSII were investigated in flag leaves of two rice cultivars, Shirobeniya (a traditionaljaponica) and Akenohoshi (an improved japonica-indica intermediate) grown under standard-nitrogen (N) (SN) and low-N (LN) conditions. N-deficiency resulted in significant decreases in total dry weight, net photosynthetic rate (Pn), the energy flux via carboxylation (Jc), and content of ribulose-1,5-bisphosphate carboxylase /oxygenase (Rubisco) in flag leaves in the two cultivars, and these parameters of Shirobeniya were lower than those in Akenohoshi under the LN condition. In the two cultivars, the energy flux via alternative electron flow was significantly increased by N-deficiency, which was accompanied by enhanced activity of superoxide dismutase (SOD). Although under the LN condition no cultivar differences were found in Ja and SOD, ascorbate peroxidase activity in Shirobeniya was lower than that in Akenohoshi. N-deficiency resulted in more significant increases in the susceptibility to photoinhibition (the degree of decrease in maximum quantum yield of PSII), hydrogen peroxide (H2O2) content and malondialdehyde content after exposure to high irradiance in Shirobeniya than those in Akenohoshi. These results indicated that the increased susceptibility to photoinhibition in the LN plants of Shirobeniya was mainly due to oxidative damages to chloroplasts, resulting from lower carboxylation and H2O2-scavenging capacities. Therefore, both carboxylation and H2O2-scavenging capacities could be important factors in determining the cultivar difference in the productivity of rice under LN conditions.
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DOI：
--
发表时间：
2006
期刊：
Photoprotection, Photoinhibition, Gene Regulation and Environment(Springer)
影响因子：
--
作者：
T.Endo;K.Asada
通讯作者：
K.Asada
影响因子：
4.3
作者：
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通讯作者：
Mae, T
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DOI：
--
发表时间：
2007
期刊：
Photosynthetica (In press)
影响因子：
--
作者：
Kumagai E.;T.Araki;F.Kubota
通讯作者：
F.Kubota
影响因子：
2.5
作者：
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通讯作者：
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