外源GA_3与低温处理对芍药种子萌发和幼苗生长的影响  

Effects of exogenous GA_3 and chilling treatments on seed germination and seedling growth of Paeonia lactiflora

作　　者：袁燕波[1] 于晓南[1] 

机构地区：[1]花卉种质创新与分子育种北京市重点实验室,国家花卉工程技术研究中心,北京林业大学园林学院,北京100083

出　　处：《安徽农业大学学报》2014年第2期273-277,共5页Journal of Anhui Agricultural University

基　　金：国家林业局引进项目"远缘杂种芍药重要亲本及高效繁育技术引进"(2012-4-59)资助

摘　　要：芍药种子具有"双休眠"特性,自然播种萌发率低,生长周期长。试验对‘朱砂判’种子进行了GA3和低温处理,研究其对促进种子萌发和幼苗生长的效果。结果表明,GA3能够解除种子下胚轴休眠并促进生根,其中100 mg·L-1GA3处理的生根率与生根质量最好,生根率最高为41.33%;低温结合GA3处理不同主根长度的种子,对解除上胚轴休眠和促进幼苗生长均具有显著性影响,当主根长度<3 cm时,低温(4℃)4周后500 mg·L-1GA3的处理最有利于种子萌芽与幼苗生长,萌芽率最高为96.67%;这种组合处理还可以促使芍药种子从播种到萌发所需时间缩至48 d。There are ＂double dormancy＂ characteristics in the seed ofPaeonia lactiflora, not only the germi- nation rate is low in the natural environment but also the growth cycle is long. Effects of exogenous GA3 and chilling treatments on seed germination and seedling growth of Paeonia lactiflora ＇Zhu Sha Pan＇ were studied under the condition of container culture. Results showed that GA3 treatments could release hypocotyl dormancy and promote rooting, and the treatment of 100 mg·L^-1 GA3 was best when concerning the rooting rate and quality and the rooting rate was as high as 41.33%. Different root length of seeds with chilling and GA3 treatments had significant effects on releasing epicotyl dormancy and promoting seedling growth. Comprehensive analysis showed that chilling treatment （4℃）for 4 weeks, combined with 500 mg·L^-1 GA3 treatment was optimal for seed germination and seedling growth when the root length was less than 3 centimeter, and the seed germination was as high as 96.67%. This combination treatment could also make the time of seed germination be shorten to 48 days.

关 键 词：芍药 低温 外源GA3 种子萌发 幼苗生长 

分 类 号：S682.12[农业科学—观赏园艺]