Promotive effect of low concentrations of NaHSO3 on photophosphorylation and photosynthesis in phosphoenolpyruvate carboxylase transgenic rice leaves

文献类型： 外文期刊

第一作者： Ji, BH

作者： Ji, BH;Tan, HH;Zhou, R;Jiao, DM;Shen, YG

作者机构：

关键词： NaHSO3;phosphoenolpyruvate carboxylase transgenic rice;photophosphorylation;photosynthesis

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2005 年 47 卷 2 期

页码：

收录情况： SCI

摘要： Spraying a 1-2 mmol/L solution of NaHSO3 on the leaves of wild-type rice (Oryza sativa L.) Kitaake (WT), phosphoenolpyruvate carboxylase (PEPC) transgenic (PC) rice and PEPC+phosphate dikinase (PPDK) transgenic rice (PC+PK), in which the germplasm was transformed with wild-type Kitaake as the gene receptor, resulted in an enhancement of the net photosynthetic rate by 23.0%, 28.8%, and 34.4%, respectively, for more than 3 d. It was also observed that NaHSO3 application caused an increase in the ATP content in leaves. Spraying PMS (a cofactor catalysing the photophosphorylation cycle) and NaHSO3 separately or together on leaves resulted in an increase in photosynthesis with all treatments. There was no additional effect on photosynthetic rate when the mixture was applied, suggesting that the mechanism by which NaHSO3 promotes photosynthesis is similar to the mechanism by which PMS acts and that both of compounds enhanced the supply of ATP. After spraying a solution of NaHSO3 on leaves, compared with the WT Kitaake rice, a greater enhancement of net photosynthetic rate was observed in PEPC transgenic (PC) and PEPC+PPDK transgenic (PC+PK) rice, with the greatest increase being observed in the latter group. Therefore ATP supply may become the limiting factor that concentrates CO, in rice leaves transformed with an exogenous PEPC gene and exogenous PEPC+PPDK genes.

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