摘要
采用PEG模拟干旱处理,研究不同浓度PEG(0、2%、4%、6%、8%、10%、12%、14%)对桔梗种子萌发及幼苗生长的影响。研究表明,与CK相比,2%、4%PEG处理的桔梗种子萌发和幼苗生长均无显著变化;6%PEG处理的桔梗种子发芽率、发芽势、发芽指数、活力指数、幼苗的芽长、根长、干重、鲜重和根苗比均显著降低,且随着PEG浓度的升高降低程度增大;10%和14%PEG处理的发芽率分别为CK的50%和10%左右。可见,低浓度PEG(2%、4%)对桔梗种子发芽和幼苗生长无显著影响,6%、10%和14%分别是开始抑制浓度、半抑制浓度和抗旱极限浓度;PEG胁迫对桔梗幼苗根的抑制程度大于芽。综上可知,桔梗属于较耐干旱的中药材植物,适宜在轻度干旱地区推广种植。
The seeds of Platycodon grandiflorum were treated by PEG at different concentrations of 0,2%,4%,6%,8%,10%,12% and 14%. The effects of drought stress on seed germination and seedling growth were studied. The results showed that compared with CK,the seed germination and seedling growth under 2% and 4% PEG treatments had no obvious changes. The germination rate,germination energy,germination index,vigor index,bug length,root length,fresh weight,dry weight,root shoot ratio under 6% PEG treatment decreased significantly,and the decrease range of all the indexes increased with the increase of PEG concentration. The germination rate in 10% and 14% PEG treatments was 50% and 10% of the control,respectively. So the low PEG concentrations（ 2%,4%） had no significant effects on seed germination and seedling growth. The 6%,10% and 14% PEG concentrations were the beginning,half and maximal inhibitory concentration,respectively. The inhibitory degree of PEG to root was higher than that to bud. Therefore,Platycodon grandiflorum had some tolerance to drought and could be planted in mildly drought region.
出处
《山东农业科学》
2016年第10期51-53,57,共4页
Shandong Agricultural Sciences
基金
山东省特色名校建设工程课程建设项目(XYX2014035)
山东省特色名校建设工程教学研究项目(XJG2013093)
山东省特色名校建设工程大学生科技创新项目(2014)
关键词
桔梗
PEG模拟干旱
种子萌发
幼苗生长
Platycodon grandiflorum
PEG drought simulation
Seed germination
Seedling growth
