Research Advances in Salt and Alkali Tolerance Improvement Technology at the Seed Germination Stage

doi:10.13560/j.cnki.biotech.bull.1985.2019-0727

Abstract

Abstract: Seed germination is the process of embryogrowth and development from relative static to physiologically active state,which is the most susceptible to the external environment,among which saline-alkali stress is one of the most serious ecological constraints. The saline and alkali land is widely distributed all over China,which is about 1×10⁸ ha and accounting for 10% of the total land area of China. Inhibition of seed germination under saline-alkali stress has become the primary obstacle to plant natural regeneration and agroforestry production in the saline and alkali land in China. At present,the known techniques to improve salt and alkali tolerance of plant at germination stage mainly include physical methods,chemical regulations,biological approaches and breeding techniques. Physical methods include seed priming and seed treating with low temperature,ultrasound,microwave,electric field and so on. Chemical regulation refers to regulation of inorganic and organic exogenous substances. Biological approaches include symbiosis of plant-promoting bacteria and fungi. Breeding techniques include salt tolerance identification,screening and genetically modified techniques. This paper systematically reviewed the research progress of methods and techniques for improving salt and alkali tolerance of plant seeds during germination period,then briefly described the characteristics and shortcomings of these technologies,and finally proposed the suggestions for further work. It is aimed to provide reference for solving the problem of seed germination hindrance in the saline-alkali land,achieving low-cost and large-scale bioremediation of the saline-alkali land and agroforestry production in saline-alkali area.

Key words: seed germination stage, salt and alkali tolerance improvement, technology

ZHU Jian-feng, YANG Xiu-yan, WU Hai-wen, ZHANG Hua-xin. Research Advances in Salt and Alkali Tolerance Improvement Technology at the Seed Germination Stage[J]. Biotechnology Bulletin, 2020, 36(2): 158-168.

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