水分胁迫下繁花杜鹃种子的萌发特性  

Research on Seed Germination Characteristics of Rhododendron floribundum Under Water Stresses

作　　者：王书珍[1] 靖鑫宇 梅元正 骆亮[1] 方元平[1] 金卫斌[1] 向福[1] 

机构地区：[1]黄冈师范学院生命科学学院/大别山特色资源开发湖北省协同创新中心/经济林木种质改良与资源综合利用湖北省重点实验室,湖北黄冈438000

出　　处：《湖北农业科学》2016年第19期4974-4977,共4页Hubei Agricultural Sciences

基　　金：黄冈师范学院博士启动基金(2013030903);经济林木种质改良与资源综合利用湖北省重点实验室开放基金(2013000403)

摘　　要：利用PEG-6000溶液模拟水分胁迫(水势梯度为-0.2^-1.0 MPa),研究繁花杜鹃种子萌发过程中对水分的需求特征。结果表明,在水分胁迫下,繁花杜鹃种子的发芽时间推迟,萌发周期延长,萌发指数Gi、活力指数Vi随着水势的降低而递减,幼苗生物量降低,胚根增长,胚芽变短,根芽比(R/P)增大;繁花杜鹃种子在萌发期对水分的依赖性较强,以出苗阶段对干旱敏感性最大,对水分要求最高,即水势不能低于-0.6 MPa。本研究为杜鹃花的繁育、种子萌发调控机制的阐述提供了理论依据。Requirements of water in the process of Rhododendron floribundum seed germination was studied under different water stresses（water potential gradient：-0.2 --1.0 MPa） simulated by PEG-6000. Under water stresses,germination time was delayed and germination period was prolonged. At the same time, values of germination index（GI） and vigor index（VI） reduced. Biomass of seedlings was also decreased. Meanwhile, the radicle and plumule ratio（R / P） was increased with the enhancement of water stress. Rhododendron seeds have a strong dependence on water during the whole germination period,especially seedling stage. The lowest water requirements of R. floribundum seed germination was estimated to be-0.6 MPa. This research will provide theoretical basis for further seedling breeding and regulation mechanism of R. floribundum and other Rhododendron species seed germination.

关 键 词：水分胁迫 种子萌发 繁花杜鹃 种苗繁育 

分 类 号：S685.21[农业科学—观赏园艺]