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《Acta Botanica Boreali-occidentalia Sinica》 2005-11
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Progresses in Seed Dormancy and Dormancy-Breaking Mechanisms

LI Rong,YE Yong~*(State Key Laboratory of Marine Environmental Science,Xiamen University,Xiamen,Fujian 361005,China)  
Seed dormancy mechanisms mainly focus on seed permeability,inhibitor action and photofrin transformation.Testa inhibition probably results from physical or chemical properties of testa,and can lead to the penetrability changes of water,light,air and solutes.The mechanisms of inhibitor action are that inhibiting substances can counteract the actions of the hormones capable of helping cell division and development.The mechanisms of photofrin transformation were originally based on the viewpoint that the synthesis,activation or breakdown of dormancy-related bioactive substances are induced by light and this has gotten strong support because the discoveries of active and passive types(Pfr and Pr) of photofrin blue proteins,and the dependence of seed dormancy on Pfr content and Pfr/(Pfr+Pr) ratio.Currently,the commonly-adopted dormancy-breaking methods are mechanically breaking testa,treating seeds with hormones,molecular biological techniques,physical techniques(such as laser,smoke curing,and heating),and carbon dioxide.The hormone balance that swings from the dominance of inhibiting substances to the dominance of growth-assisting substances is the major dormancy-breaking factor.There are quite a few molecular biological techniques of studying the dormancy-breaking mechanisms,which include ABA mutant use,molecular markers,transgenic technique,gene-expression blocking by antisense RNA,and cDNA cloning.Seeds are exposed to laser and receive a certain amount of radiation,which can increases the biological energy of their cells thus enhancing their development and breaking their dormancy.The mechanism of heating treatment is that heating can increase the air permeability of testa.The reason for carbon dioxide to raise the germination rates of some species is that it affects ethene sensitivity in seeds.
【Fund】: 国家自然科学基金资助项目(40476040);; 福建省自然科学基金资助项目(D0410006)
【CateGory Index】: Q945.35
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