Response of Gas Exchange and Water Use Efficiency to Light Intensity and Temperature in Transgenic Rice Expressing PEPC and PPDK Genes

文献类型： 外文期刊

第一作者： Jiao De-mao

作者： Jiao De-mao;Zhang Bian-jiang;Chen Quan-zhan;Hua Chun;Zhou Feng;Zhou Quan-chen

作者机构：

关键词： transgenic rice;photosynthetic characteristics;water use efficiency;stomatal conductance

期刊名称：AGRICULTURAL SCIENCES IN CHINA （ 影响因子：0.82； 五年影响因子：0.997 ）

ISSN： 1671-2927

年卷期： 2009 年 8 卷 11 期

页码：

收录情况： SCI

摘要： Aiming to controvert whether the photosynthetic capacity of transgenic rice expressing C(4) genes is enhanced, with the C(3)-type untransformed rice (WT) and maize (a C(4) plant) as controls, the activity of C(4) photosynthetic enzymes, gas exchange parameters and water use efficiency (WUE) under different light intensities and temperatures, the stable carbon isotope ratio (PC) value and the metabolic index of active oxygen as well as plant yield parameters were determined in transgenic rice carrying the PEPC and PPDK genes (CK) in this study. The results showed that the light-saturated photosynthetic rate of CK was intermediate between that of WT and maize, with a slight bias towards that of maize. Under a high light intensity (1200 mu mol m(-2) s(-1)) and high temperature (35 degrees C), CK still exhibited higher photosynthetic capacity, while the Gs decreased. The WUE of CK was only slightly increased, and was similar to that of WT. The delta(13)C value indicated that CK functioned as a C(3) plant. In addition, the tolerance to photo-oxidation and grain yield of CK was enhanced by sprayed with NaHSO(3). In conclusion, CK possesses higher photosynthetic productivity under the conditions of high photon flux density (PFD), high temperature and spraying with NaHSO(3) solution, thereby providing a new technical approach and physiological basis for constructing C(4)-like rice.

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