文献类型：期刊文献

中文题名：层积催芽对美国黑核桃种子发芽和苗木生长的影响

英文题名：SEED GERMINATION AND SEEDLING GROWTH ASSOCIATED WITH STRATIFICATION WAYS ON JUGLANS NIGRA

作者：裴东[1] 张俊佩[1] 石永森[2] 徐虎智[3]

第一作者：裴东

机构：[1]中国林业科学研究院林业研究所;[2]河南省鄢陵北方花卉集团公司;[3]河南省洛宁县林业局

年份：2002

卷号：38

期号：5

起止页码：73-77

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：美国黑核桃;种子发芽;苗木生长;层积处理

外文关键词：Julans nigra L., Seed, Stratification, GA 3, ABA, Water content

分类号：S664.1

摘要：以低温贮藏 1a的美国黑核桃种子为试材 ,对层积处理与种子含水率、内源激素、种子萌发及其后苗木生长的关系进行了研究。黑核桃种子对层积时间要求较高。在低温层积过程中种子缓慢吸水 ,当达到饱和含水率时 ,开始萌动。层积前种子含水率愈高 ,达到饱和含水率所需的层积时间愈短。休眠的黑核桃种子GA3含量较低 ,ABA含量最高 ;随层积时间延长 ,GA3明显上升 ,ABA含量急剧下降到零 ;GA3/ABA比值 ,可能是控制黑核桃种子休眠和萌发的内部因子。层积催芽前最好的预处理方法是浸种 5～ 6d ,然后在 2～ 5℃层积催芽 12 0～ 15 0d ,田间发芽率可达 75 %。层积催芽前用吸湿法预处理虽然延缓了水分吸收 ,但并未起到提高发芽率的作用。低温层积催芽可促进黑核桃当年生苗木生长 ,层积时间愈长 ,苗木的平均长势愈强。
Seeds of Juglans nigra L.stored for one year under 0～5?℃ were adopted in this research to investigate the effect of stratification ways on seed water content, endogenous hormon content, germination and following seedling growth. The period of stratification was highly required by the seeds of J.nigra to make a successived germination and later on vigor growth. It was slower for the seeds to absorb water during stratification. As reaching saturation water content, the seeds were available to germinate. The higher the seed water content was before stratification, the shorter the time to be used to reach the saturation water content would be. The dormant seed contained lower level of GA 3 and high ABA. As the stratification process, GA 3 showed an obvious increase and ABA a sharp decrease, finally to zero. The rate of GA 3 to ABA might be an inner factor to control the seed germination. Among the stratification ways, the treatment of soaking the seeds in water for 5～6 days and then stratifying them at 2～5?℃ for 120～150 days presented the best and seed germination rate could be achieved as high as 75%. Although moisture absorption pretreatment could retard seed water absorbing, mosture absorption treatments showed no promoting seed germination. The stratification under low temperature had a significant effect to promote seedling growth in the following growing season and the promoting effect was enhanced as the stratification time increasing within a certain extent.