Global genome expression analysis of photosynthesis-related genes under low nitrogen stress in rice flag leaf | 全基因组分析低氮胁迫下水稻剑叶光合相关基因表达变化

Chinese. 【目的】研究水稻剑叶叶绿素和光合特性及相关基因对低氮胁迫的响应,为提高水稻对氮肥的吸收和利用效率奠定分子基础。【方法】利用Agilent 4×44K芯片全基因组研究低氮胁迫处理下,2个不同叶绿素含量水稻齐穗期剑叶的光合相关基因表达的变化。【结果】SN19-6和丰锦剑叶的叶绿素含量和净光合速率在低氮胁迫下均有所下降,但SN19-6 2个指标下降的幅度明显较小。低氮胁迫处理与对照处理相比,超绿水稻SN19-6剑叶共有41个光合相关基因表达发生变化(14个在转录水平上下调表达,27个在转录水平上上调表达)。丰锦剑叶有29个光合相关基因表达发生变化(15个在转录水平上下调表达,14个在转录水平上上调表达)。低氮胁迫响应光合相关基因表现出品种特异性,超绿水稻SN19-6有29个为特异响应的,丰锦有17个特异响应的。2水稻品种(系)低氮胁迫响应的光合相关基因有12个重叠的,其中,5个在转录水平上上调表达,7个下调表达。【结论】在低氮胁迫下,水稻剑叶光合相关基因的表达发生变化,不同叶绿素含量水稻品种(系)中的表达既表现特异性,也存在部分重叠。

English. 【Objective】 The response of photosynthesis-related genes to low nitrogen stress were researched, thus providing a molecular basis for improving the absorption efficiency and utilization efficiency of nitrogen fertilizer in rice. 【Method】 The Agilent rice genome arrays were used to study the expression change of photosynthesis-related genes in two rice cultivars with different chlorophyll contents under low nitrogen fertilizer stress. 【Result】 The results showed that chlorophyll content and photosynthetic rate of the flag leaf were decreased under low nitrogen stress in SN19-6 and Fengjin, but the degree of decrease was significantly different between SN19-6 and Fengjin. A total of 41 photosynthesis-related genes (14 photosynthesis-related genes were down-regulated and 27 photosynthesis-related were up-regulated at the transcription level) in flag leaf of supper-green rice SN19-6 and 29 photosynthesis-related genes (15 photosynthesis-related genes were down-regulated and 14 photosynthesis-related genes were up-regulated at the transcription level) in flag leaves of Fengjin were affected by low nitrogen stress. The photosynthesis-related genes for expressed cultivar special-response to low nitrogen stress, with 29 photosynthesis-related genes for SN19-6 and 17 for Fengjin. There was an overlap of photosynthesis-related genes in response to low nitrogen stress between SN19-6 and Fengjin, with 5 up-regulated and 7 down-regulated at the transcription level, respectively.【Conclusion】 Expression of photosynthesis-related genes were affected by low nitrogen stress in flag leaf, and there are genes of cultivar special-response as well as overlap between SN19-6 and Fengjin.