Overexpression of transcription factor ZmPTF1 improves low phosphate tolerance of maize by regulating carbon metabolism and root growth
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- 作者：Zhaoxia Li (1)
Qiang Gao (1)
Yazheng Liu (1)
Chunmei He (1)
Xinrui Zhang (1)
Juren Zhang (1) - 关键词：Carbon metabolism ; Maize ; Phosphate ; Root growth ; ZmPTF1
- 刊名：Planta
- 出版年：2011
- 出版时间：June 2011
- 年：2011
- 卷：233
- 期：6
- 页码：1129-1143
- 全文大小：859KB
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Qiang Gao (1)
Yazheng Liu (1)
Chunmei He (1)
Xinrui Zhang (1)
Juren Zhang (1)
1. School of Life Science, Shandong University, 27 Shanda South Road, 250100, Jinan, People鈥檚 Republic of China
文摘
A bHLH (basic helix-loop-helix domain) transcription factor involved in tolerance to Pi starvation was cloned from Zea mays with an RT-PCR coupled RACE approach and named ZmPTF1. ZmPTF1 encoded a putative protein of 481 amino acids that had identity with OsPTF1 in basic region. Real-time RT-PCR revealed that ZmPTF1 was quickly and significantly up-regulated in the root under phosphate starvation conditions. Overexpression of ZmPTF1 in maize improved root development, enhanced biomass both in hydroponic cultures and sand pots, and the plants developed more tassel branches and larger kernels when they were grown in low phosphate soil. Compared with wild type, overexpressing ZmPTF1 altered the concentrations of soluble sugars in transgenic plants, in which soluble sugars levels were lower in the leaves and higher in the roots. Overexpression of ZmPTF1 enhanced the expression of fructose-1,6-bisphosphatase and sucrose phosphate synthase1 participated in sucrose synthesis in the leaves but decreased them in the root, and reduced the expression of genes involved in sucrose catabolism in the roots. The modifications on the physiology and root morphology of the plants enhanced low phosphate tolerance and increased the yield under low phosphate conditions. This research provides a useful gene for transgenic breeding of maize that is tolerant to phosphate deficiency and is helpful for exploring the relationship between sugar signaling and phosphate concentrations in cells.