光照强度对青藏高原东缘九种紫草科植物种子萌发的影响  

Effect of light intensity on seed germination in nine Boraginaceae species on the eastern Qinghai-Tibet plateau

作　　者：张蕾[1] 张春辉[1] 吕俊平[1] 王晨阳[1] 张莹莹[1] 卜海燕[1] 杜国祯[1] 

机构地区：[1]兰州大学干旱与草地生态教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2011年第5期67-72,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金重点项目(40930533);高等学校博士学科点专项科研基金项目(20100211120004)

摘　　要：以青藏高原东缘九种紫草科植物为对象,在100%自然全光照以及36%NS和3%NS的光照强度下,对其种子萌发特征进行了研究.选取了萌发率,萌发指数和平均萌发时间三个萌发参数,并且依据种子萌发对光响应的不同将本实验所研究的九种紫草科植物分为以下四类:1)对光照梯度无响应,即不同光照强度下GP,GI和MGT部无显著变化的有狼紫草、西藏附地菜、小花琉璃草、甘青微孔草和微孔草;2)光照减小了GP和GI,延长了MGT的有倒提壶与卵盘鹤虱;3)光照梯度对GP和GI都无影响,而延长了MGT的有小叶滇紫草;4)光照提高了GP和GI而对MGT无影响的有糙草.此九种紫草科值物可能存在两种萌发对策,即感应水分和感应光照,来选择萌发时间和萌发数量,从而在萌发行为上产生了生态位分化.Seed germination characteristics of nine Boraginaceae species on the eastern Qinghai-Tibet plateau were investigated sunder three different light gradients（100% natural sunlight（NS）, 36% NS, 3% NS）. Germination percentage （GP）, germination index （GI） and mean germination time （MGT） were chosen as germination parameters and, according to the germination response to light, these nine Boraginaceae species were classified as follows： 1） Under different light, GP, MGT and GI showed no significant difference in Lycopsis orientalis, Trigonotis tibetica, Cynoglossum lanceolatum, Microula pseudotrichocarpa, Microula sikkimensis; 2） Light decreased both GP and GI of Cynoglossum amabile and Lappula redowskii while increasing MGT; 3） Light had no influence on GP and GI of Onosma sinicum while increasing MGT; 4） Light increased both GP and GI of Asperugo procumbens while MGT had no significant difference. We think that there may be two germination strategies （responding to water or light） existing in these nine Boraginaceae species and, by these two approaches, they can choose germination time and germination quantities and make niche differences in germination behavior.

关 键 词：种子萌发 光照强度 萌发率 平均萌发时间 萌发速率指数 青藏高原东缘 

分 类 号：Q948[生物学—植物学]