盐分、变温和激素处理对盐生植物异子蓬异型性种子萌发及成苗的影响  

Effects of salt,alternating temperature and hormone treatments on seed germination and seedling establishment of Suaeda aralocaspica(Chenopodiaceae) dimorphic seeds

作　　者：何美香[1] 杜晓峰[1] 陈玲[1] 吕秀云[1] 兰海燕[1] 

机构地区：[1]新疆大学生命科学与技术学院,新疆生物资源基因工程重点实验室,乌鲁木齐830046

出　　处：《生态学杂志》2013年第1期45-51,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31060027;31260037);新疆生物资源基因工程重点实验室开放基金项目(XJDX0201-2011-03)资助

摘　　要：利用培养皿种子萌发及土壤盆栽方法对新疆特有藜科1年生盐生植物异子蓬(Suaeda aralocaspica)在不同盐分(NaCl和Na2SO4)、变温(4～30℃)和激素(GA3)处理下的种子萌发及成苗行为进行了研究。结果表明:异子蓬2种种子在NaCl和Na2SO42种盐胁迫下的萌发和休眠特性表现出明显差异,其中黑色种子的萌发率比褐色种子低;黑色种子属于非深度生理休眠,可分别通过15/30℃变温处理、4℃低温层积30d及用800mg.L-1赤霉素处理促进其萌发;盐处理及温度变化对褐色种子的出苗率和成苗率影响显著,对黑色种子则不明显,说明黑色种子萌发存在着持续性的缓萌机制,有利于其形成持久种子库,以上特性均显示出其对初春盐生环境的适应性。Petri dish germination and pot culture experiments were conducted to study the effects of salts （ NaC1 and Na2 SO4 ） on the seed germination and , alternating temperature （430 ℃ ） and hormone （ GA3 ） treatments seedling an annual halophyte only distributed in establishment of Suaeda aralocaspica （Chenopodiaceae）, Xinjiang of Northwest China. There existed obvious differ ences in the dormancy and germination characteristics between the two seed morphs （black and brown） of S. aralocaspica under the stresses of NaC1 and Na2 SO4. The black seeds had a lower germination rate than the brown seeds, were of nondeep physiological dormancy, and their ger mination rate could be increased after 15/30 ℃ alternating temperature, 30 days of cold stratifi cation at 4 ℃, and 800 mg . L-1 of GA3 treatment. Salt and alternating temperature treatments could significantly affect the seedling emergence rate and establishment rate of brown seeds, but had lesser effects on black seeds, indicating that the black seeds could have persistent slowger mination mechanism, being favorable for the formation of persistent seed bank. All the results showed the adaptability of S. aralocaspica to saline environment in early spring.

关 键 词：异子蓬 异型种子 盐生植物 萌发机制 

分 类 号：Q945.78[生物学—植物学]