Volume 48, Issue 12 pp. 1431-1438
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CO2 Exchange and Chlorophyll Fluorescence of Phospho-enolpyruvate Carboxylase Transgenic Rice Pollen Lines

Li-Li Ling

Li-Li Ling

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu 610064, China

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Hong-Hui Lin

Corresponding Author

Hong-Hui Lin

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu 610064, China

*Authors for correspondence. Tel: +86 (0)28 8541 1175; +86 (0)25 8443 7478; E-mail: <[email protected]>; <[email protected]>Search for more papers by this author
Ben-Hua Ji

Ben-Hua Ji

Institute of Life Sciences, Nantong University, Nantong 510061, China

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De-Mao Jiao

Corresponding Author

De-Mao Jiao

Jiangsu Academy of Agricultural Sciences, 84-401, Nanjing 210014, China

*Authors for correspondence. Tel: +86 (0)28 8541 1175; +86 (0)25 8443 7478; E-mail: <[email protected]>; <[email protected]>Search for more papers by this author
First published: 05 December 2006
Citations: 1

Supported by the National Natural Science Foundation of China (30571119), Sichuan Science and Technology Foundation (04ZQ026-036), and Program for New Century Excellent Talents in University (NCET-05-0786).

Abstract

To elucidate the photosynthetic physiological characteristics and the physiological inherited traits of rice (Oryza sativa L.) hybrids and their parents, physiological indices of photosynthetic CO2 exchange and chlorophyll fluorescence parameters were measured in leaves of the maize phosphoenolpyruvate carboxylase (PEPC) transgenic rice as the male parent, sp. japonica rice cv. 9516 as the female parent, and the stable JAAS45 pollen line. The results revealed that the PEPC gene could be stably inherited and transferred from the male parent to the JAAS45 pollen line. Moreover, the JAAS45 pollen line exhibited high levels of PEPC activity, manifesting higher saturated photosynthetic rates, photosynthetic apparent quantum yield (AQY), photochemical efficiency of photosystem II and photochemical and non-photochemical quenching, which indicated that the JAAS45 pollen line has a high tolerance to photo-inhibition/photo-oxidation under strong light and high temperature. Furthermore, JAAS45 was confirmed to still be a C3 plant by δ13C carbon isotope determination and was demonstrated to have a limited photosynthetic C4 microcycle by feeding with exogenous C4 primary products, such as oxaloacetate or malate, or phosphoenolpyruvate. The present study explains the physiological inherited properties of PEPC transgenic rice and provides an expectation for the integration of traditional breeding and biological technology.

(Managing editor: Ping He)

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