Dormancy release and germination of Echinochloa crus-galli grains in relation to galactomannan-hydrolysing enzyme activity
Dormancy release and germination of Echinochloa crus-galli grains in relation to galactomannan-hydrolysing enzyme activity作者机构：College of Biology Resources and Environmental Sciences Jishou University Institute of Botany Chinese Academy of Sciences
出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)
年 卷 期：2015年第14卷第8期
页 面：1627-1636页
核心收录：
基 金：supported by grants from the National Science and Technology Support Program of China(2012BAC01B05)
主 题：after-ripening deep physiological dormancy Echinochloa crus-galli galactomannan-hydrolysing enzyme phytohormone stratification
摘 要：Echinochloa crus-galli, one of the world＇s most serious weeds, influences seriously the yield and quality of cereal crop *** is well known that ***-galli grain is dormant, but its dormant type, as well as its dormancy release and germination in relation to galactomannan-hydrolysing enzyme activity were poorly *** cooperation of endo-β-mannanase（EC 3.***.1.78）, β-mannosidase（EC 3.***.1.25） and α-galactosidase（EC 3.***.1.22） can hydrolyze the cell walls rich in mannan-based *** the present paper, the mature grains are used as experimental materials, we investigated the water uptake of grains, the effect of removing partial endosperm, after-ripening, stratification and phytohormone on grain germination, and the change in endo-β-mannanase, β-mannosidase and α-galactosidase activities of grains during after-ripening and *** results showed that the freshly-collected grains were water-permeable and had only phase I and II of water uptake, while the grains after-ripened for 150 d had an obvious phase III of water *** alternating photoperiod, the germination of grains freshly-collected was zero at 10–35°C, and that of half grains was 11% at 20°C *** grain germination was notably promoted by after-ripening and stratification, but not by gibberellic acid and 6-benzyladenine at 0.0001–1 mmol L–1.β-Mannosidase activity increased during 0 to 300 d of after-ripening and then *** activity of endo-β-mannanase and α-galactosidase of grains decreased with *** grain germination, endo-β-mannanase and β-mannosidase activities obviously increased, while α-galactosidase activity *** data showed that ***-galli grain was a deep physiological dormant, the dormancy release by after-ripening was related to an increasing β-mannosidase activity, and its germination was closely associated with an increasing endo-β-mannanase and β-mannosidase activity; which have provided new knowledge to decrease the harm of ***
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