摘要
以凤丹种子(Paeonia ostii)为试验材料,通过对凤丹种子种皮透水性、种胚形态和生活力、种子内源抑制物质活性的测定,研究凤丹种子休眠特性。结果表明:凤丹种皮降低种子吸水速度,但不影响最终吸水率,完整种子浸种56h种子吸水基本达到饱和,对凤丹种皮进行酸蚀或去皮处理不会提高萌发率,凤丹种皮不是休眠的主要原因;成熟的凤丹种子生活力达95.6%,但种胚发育不完全,其需经过一定时间的层积,种胚才能不断生长分化,完成后熟;种皮和胚乳中含有的萌发抑制物质对白菜种子和自身种子萌发有显著抑制作用,且种皮和胚乳中的抑制物含量和种类不同;300mg·L-1的外源GA3能够有效提高凤丹种子萌发率。凤丹种子休眠是由于种胚发育不完全和生理后熟以及种子内存在抑制物质引起的综合休眠。
This research focused on the dormancy traits of the seeds of a tree peony cultivar,Paeonia ostii‘Feng Dan＇,by studying the water permeability of the seed coat,form and vitality of the seed embryo as well as activity of the endogenous inhibitors.The results indicated that the seed coat hindered the speed of water absorption,but it did not affect the final water absorbance ratio of the seeds.The seeds were saturated after they were immersed in water for 48 hours,from which the germination rate would not be enhanced by de-coating or acid degradation treatments.The vitality of the mature seeds could reach to as high as95.6%.However,the embryos were not fully developed,stratification treatment should be carried out to accelerate embryo differentiation and to finish post-mature process.The endogenous inhibitors contained both in seed coat and embryo had significant inhibiting effects on seeds of Brassica pekinensis and peony itself.The contents and the types of endogenous inhibitors in seed coat were different from those in seed embryo.Extraneous hormone GA3 with a concentration of 300mg·L-1 could enhance the seed germination rate.In conclusion,the seed dormancy of P.ostii‘Feng Dan＇was a comprehensive result caused by the immaturity of seeds and the inhibitors.
出处
《西北林学院学报》
CSCD
北大核心
2016年第4期165-169,共5页
Journal of Northwest Forestry University
基金
林业公益性行业科研重大专项"油用牡丹新品种选育及高效利用研究与示范"(201404701)
关键词
凤丹
种子
休眠
萌发
Paeonia ostii ‘Feng Dan＇
seed
dormancy
germination
