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本文研究了毛白杨嫩枝和硬枝插穗生根能力的季节变化,生根能力与插穗上的芽和叶的关系;内源脱落酸含量对生根能力的影响。在年周期中,毛白杨嫩枝插穗的生根能力以6月—7月最强,8月较强,9月较弱;硬枝插穗的生根能力9月较强,10月—12月最弱,1月较强,2月—4月最强。硬枝插穗上的芽在生根能力最强的春季有促进生根的作用;但在生根能力最弱的冬季,芽的有无并不表现促进或抑制作用。嫩枝插穗的生根与苗高生长节律吻合,即苗木速生期生根能力也强。插穗生根能力的季节变化和内源脱落酸含量有关。休眠期间脱落酸含量很高,生根能力很低;生长旺季脱落酸含量剧降,生根能力最高。试验研究了插穗水分状况,糖、氮含量,酚类物质含量,酶活性和呼吸强度等因子,认为插穗活跃的生理状态有利于生根。嫩枝插穗水分充足,酶活性较强,脱落酸含量低,比硬枝插穗容易生根。插穗中以邻苯二酚为主的大量酚类物质没有表现出生根的促进或抑制作用。
In this paper, the seasonal changes of rooting ability of cuttings and hardwood cuttings of Populus tomentosa, the relationship between rooting ability and shoots and leaves on cuttings, and the effect of endogenous abscisic acid on rooting ability were studied. In the annual cycle, the rooting ability of young cuttings of Cunninghamia lanceolata was strongest in June-July, stronger in August and weaker in September; the ability of rooting of hardwood cuttings was stronger in September and weakest in October-December , Strong in January, February-April strongest. The shoots on the branches of hardwood cuttings promoted the rooting in the spring with the strongest rooting ability. However, in the wintering weakest winter, the buds did not show the promotion or inhibition. Rooting shoots and shoot height growth rhythm consistent, that is, seedling fast growing ability is also strong. The seasonal variation of rooting ability of cuttings is related to the content of endogenous abscisic acid. Abscisic acid content during dormancy is very high, and the ability of rooting is very low. Abscisic acid content is sharply decreased and rooting ability is highest during the growing season. The factors of moisture status, sugar content, nitrogen content, phenolic content, enzyme activity and respiratory intensity of cuttings were studied experimentally, and the active physiological state of cuttings was found to be favorable for rooting. Cuttings adequate moisture, strong enzyme activity, abscisic acid content is low, easy to root than hard cuttings. Catechins in a large number of catechol-based phenolic substances did not show the promotion or inhibition of rooting.