Different modes of proline accumulation in response to saline-alkaline stress factors in rice (Oryza sativa L.) Lv Bing-Sheng1, Li Xiao-Wei2, Ma Hong-Yuan2, Yang Hao-Yu2, Wei Li-Xing1, Lv Hai-Yan1, Jiang Chang-Jie3,*, Liang Zheng-Wei2,4,** North-east Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin-130 102, China 1University of Chinese Academy of Sciences, Beijing-100 049, China 2Da'an Sodic Land Experiment Station, Da'an, Jilin-131 317, China 3Disease Resistant Crop Research and Development Unit, National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba-305 8602, Japan 4Key Laboratory of Soybean Molecular Design Breeding, Chinese Academy of Sciences, Harbin, Heilongjiang-150 081, China *E-Mail: cjjiang@affrc.go.jp
**liangzw@neigae.ac.cn
Online published on 27 March, 2014. Abstract Proline accumulation is a common physiological response to various abiotic stresses in plants. In this study, we show that rice seedlings accumulate proline to different levels in response to different saline-alkaline stress factors including osmotic, saline and alkaline stresses. Expression analysis of genes for proline biosynthesis (OsP5CS1, OsP5CS2 and OsP5CR) and catabolism (OsPDH1 and OsP5CDH) revealed up-regulation of the proline synthesis genes under osmotic and alkaline stresses. In comparison, under the salt stress, a decrease in catabolic enzyme gene expressions was observed. Our results suggest that rice seedlings employ different gene regulation in proline accumulation in response to different saline-alkaline stress factors. Top Keywords Proline accumulation, saline-alkaline stress, stress response, transcriptional regulation. Top |