摘要
以天然生长于祁连山自然保护区隆畅河自然保护站的濒危植物蒙古扁桃(Prunusmongolica)去内果皮的种子为材料,以不同渗透势PEG-6000溶液模拟干旱条件,研究了种子萌发和幼苗生长对干旱胁迫的响应特征。结果表明,随着干旱胁迫程度的加剧,蒙古扁桃种子吸胀速率、萌发率、萌发指数、活力指数、苗高和根长、组织饱和含水量等指标均表现出明显降低的趋势,而幼苗初生芽干重、根干重和根冠比均呈先升后降的趋势。蒙古扁桃种子对水势变化既敏感又抗旱,种子能够萌发的最低渗透势阈值为-0.65MPa。干旱胁迫未能萌发的种子复水后萌发率较高。分析认为,蒙古扁桃种子萌发和幼苗生长对干旱胁迫的响应特征对种的延续具有重要意义,但在人工栽培时保证土壤墒情应是保障建植成功的关键措施。
Mongolian almond （Prunus mongolica Maxim） is an endangered species in Mount Qilian Nature Reserve. This study investigated the response of its seed germination and seedling growth to drought stress, using osmotic treatments by PEG-6000 solution. The result indicated that rate of imbibition, germination, index of germination and seedling vigor, seedling height, and root length decreased as the concentration of PEG-6000 increased. The fresh seedling dry weight, root dry weight, and root/shoot ratio first increased and then decreased. Mongolian almond seed was sensitive to changes in soil water potential, with the minimum threshold for germination being 0.65 MPa. Response chara cteristics of the drough stress of mongolian almond seed germination and seedling growth have important meaning for the continuation of the species.
出处
《干旱地区农业研究》
CSCD
北大核心
2014年第1期191-195,共5页
Agricultural Research in the Arid Areas
基金
中医药行业科研专项子课题(2013ZYZYPC-17)
河西学院祁连学者计划(201202)
河西学院大学生科技创新基金
关键词
蒙古扁桃
吸水速率
吸水率
萌发率
渗透胁迫
Prunus mongolica Maxim
germination percentage
water uptake rate
germination rate
osmotic stress
