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以野外居群中的簇枝补血草为试材,采用花粉/胚珠比、杂交指数、套袋和萌发试验等方法,初步研究特定地理条件对簇枝补血草开花动态、繁育系统和种子特性的影响。结果表明:簇枝补血草开花期5—6月,单花持续期约3d,单株花持续期约30d,种群花持续期约40d;将单花发育过程分为4个阶段,在第2阶段雌雄蕊同时成熟,并存在空间异位现象;一天中花粉活力和柱头可授性在15:00—17:00,二者出现重叠的高峰期;P/O值、OCI值以及授粉试验表明,簇枝补血草的繁育系统为兼性异交,自交亲和,有时需要传粉者;自然状态下,种子附属物对其萌发有抑制作用,其中花萼对其影响最大,且种子经过储存后萌发率更高;簇枝补血草为适应干旱多变的荒漠环境,采用这种特殊方式来保证有一定数量的后代而不致于导致该种群个体数量的衰退。
The study was conducted to study the flowering dynamics, breeding system and seed characteristics of Limonium bracteata with specific geographical conditions by using methods of pollen / ovule ratio, hybridization index, bagging and germination test. influences. The results showed that the flowering stage of Limonium aureum was 5-6 months, the duration of single flower was about 3d, the duration of single flower was about 30 days, and the duration of flowering population was about 40 days. The single flower development process was divided into 4 stages, Stamens and pistils were mature at the same time, and there was spatial ectopic phenomenon. The pollen viability and stigma receptivity in the day ranged from 15: 00-17: 00, with overlapping peaks. The P / O value, OCI value and pollination , The seedling limonium breeding system for facultative heterosexual, self-compatible, and sometimes need pollinators; natural state, the seed appendages on its germination inhibition, in which calyx has the greatest impact, and the seeds after storage The germination rate is higher. In order to adapt to arid and changeable desert environment, the branch seed Limonium is guaranteed to have a certain number of offspring without causing the decline of the individuals in this population.