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Improved short-term drought response of transgenic rice over-expressing maize C-4 phosphoenolpyruvate carboxylase via calcium signal cascade

文献类型: 外文期刊

作者: Liu, Xiaolong 1 ; Li, Xia 1 ; Dai, Chuanchao 3 ; Zhou, Jiayu; Yan, Ting 1 ; Zhang, Jinfei 1 ;

作者机构: 1.Jiangsu Acad Agr Sci, Inst Food Crops, Prov Key Lab Agrobiol,China Natl Ctr Rice Improve, Jiangsu High Qual Rice R&D Ctr,Nanjing Branch, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Coll Life Sci, Nanjing 210095, Jiangsu, Peoples R China

3.Nanjing Normal Univ, Coll Life Sci, Jiangsu Engn & Technol Res Ctr Ind Microbial Re

关键词: Rice (Oryza sativa L.);Drought;Phosphoenolpyruvate carboxylase;Signal transduction;Endogenous Ca2+

期刊名称:JOURNAL OF PLANT PHYSIOLOGY ( 影响因子:3.549; 五年影响因子:4.164 )

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收录情况: SCI

摘要: To understand the link between long-term drought tolerance and short-term drought responses in plants, transgenic rice (Oryza sativa L.) plants over-expressing the maize C-4-pepc gene encoding phosphoenolpyruvate carboxylase (PC) and wild-type (WT) rice plants were subjected to PEG 6000 treatments to simulate drought stress. Compared with WT, PC had the higher survival rate and net photosynthetic rate after 16 days of drought treatment, and had higher relative water content in leaves after 2 h of drought treatment as well, conferring drought tolerance. WT accumulated higher amounts of malondialdehyde, superoxide radicals, and H2O2 than PC under the 2-h PEG 6000 treatment, indicating greater damages in WT. Results from pretreatments with a Ca2+ chelator and/or antagonist showed that the regulation of the early drought response in PC was Ca2+-dependent. The NO and H2O2 levels in PC lines were also up-regulated via Ca2+ signals, indicating that Ca2+ in PC lines also reacted upstream of NO and H2O2. 2-h drought treatment increased the transcripts of CPK9 and CPK4 in PC via positive up-regulation of Ca2+. The transcripts of NAC6 [NACs (NAM, ATAF1, ATAF2, and CUC2)] and bZIP60 (basic leucine zipper, bZIP) were up-regulated, but those of DREB2 B (dehydration-responsive element-binding protein, DREB) were down-regulated, both via Ca2+ signals in PC. PEPC activity, expressions of C4-pepc, and the antioxidant enzyme activities in PC lines were up-regulated via Ca2+. These results indicated that Ca2+ signals in PC lines can up-regulate the NAC6 and bZIP60 and the downstream targets for early drought responses, conferring drought tolerance for the long term.

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