Research Progress on the Identification of Salt-tolerance Related Genes and Molecular Mechanism on Salt Tolerance in Higher Plants
Shan Lei1,2* Zhao Shuangyi2 Xia Guangmin21 Hi-Tech Research Center, Shandong Academy of Agricultural Sciences, Jinan, 250100; 2 School of Life Sciences, Shandong University, Jinan, 250100*
The trait of salt-tolerance in higher plant is a very sophisticated quantity trait, which need lots of genes and different kinds of salt-tolerant mechanism to coordinate. This paper summarizes the achievements and the recent developments of plant salt tolerance research at home and abroad. Na+/H+ antiporter, K+ transporter HAK and the regulation gene AtHAL3a of K+ transport, and high affinity K+ transporter (HKT) and so on can withstand salt stress through regulating ion transport and reestablishing homeostasis in plant or plant cells; Delta'-pyrroline-5-carboxylate synthetase and reductase (P5CS, P5CR) gene, choline monooxygenase (CMO) and betaine aldehyde dehydrogenase (BADH), mannitol-1-P dehydrogenase (mtlD), sorbitol-6-Phosphate dehydrogenase (gutD) and trehalose-6-phosphate snthase gene can maintain the osmotic pressure and scavenge ROS, as well as stabilize the protein structure to prevent harm from salt stress through the biosynthesis of osmoprotective agents; Also the antioxidant enzymes such as superoxide dismutases (SOD), catalases, and enzymes in ascorbate- glutathione cycle, etc. play the key roles of scavenging more ROS in plant cells; Aquaporins and late embryogenesis abundant (LEA) proteins participate in the responding of multi-stress, which maybe relate with maintain water balance in cell; In addition, the receptor protein, cis-acting element, transcription factor, kinases and other regulation sequences can activate or inhibit some downstream effect genes related with stress, and all of these genes make full functions coordinately in different time and space to keep plant growing and developing regularly. In brief summary, this paper also indicates the basic molecular mechanism of plant perceiving the signal of salt stress and responding to it as a global level, and establishes the theoretical base for the more research of plant salt tolerance as well as breeding of salt tolerance crops.
【CateGory Index】： Q943