菹草石芽萌发影响因子及其阶段性生物学积温研究
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摘要:
通过模拟实验研究了水位、光照、基质和絮凝剂对菹草石芽萌发及幼苗的影响,并探究了其幼苗去除顶芽再发新枝的阶段性生物学积温.结果表明:水位越深初始萌发越迟,全萌发所需天数浅水位<中水位<深水位,水位对幼苗形态特征有明显影响.光照下10d萌发率大于黑暗处理,湖泥中,有光和无光对石芽萌发影响并不明显,而在营养液中,有光明显促进石芽的萌发.光照下枝条数和根数大于黑暗处理.絮凝剂显著(P<0.05)延迟石芽萌发,但不影响最终发芽率.去除顶叶的菹草幼苗萌发新枝的生物学有效积温为177.84日度,生物学零点温度为5.57℃,相同温度下随去除幼苗顶芽数增加再发新枝所需历期增长.
By simulated experiment,the effects of water depth,illumination,matrix and flocculating agent on the germination of Potamogeton crispus turion as well as seeding was investigated.And the authors preliminarily explored the biological accumulated temperature of the seedlings sprouting new branch after removing parietal lobes.The results showed：the effect of the initial germination for P.crispus clints influenced by water level showed a certain regularity,the deeper the water level the initial germination later.The required number of days of all clints germination：shallow water level〈medium water level〈deep water levels.Besides,the water level has obvious influence on seedling morphological feature.The 10 th day germination rate under light is greater than that under the darkness.Cultured by lake muds,whether light or darkness is not evident for germination of P.crispus clints.While being cultured by nutrient solution,it is significant to promote the germination of clint under light.The branch numbers and root numbers cultured under light are bigger than that darkness.Adding flocculant significantly delay the clints germination,however didn＇t influence the final germination rate.Removed parietal lobes,the biological accumulated temperature needed for the seedlings sprouting new branchs was 177.84day-degrees,the threshold temperature of development was 5.57℃.The developmental duration for the seedlings sprouting new branch prolonged with the increase of numbers of parietal lobes removed at the same temperature.
作者:
蔺庆伟 杨佩昀 高伟 王洁玉 马剑敏 刘碧云 贺锋 吴振斌
机构地区:
betway官方app 生命科学学院 中国科学院水生生物研究所
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2015年第2期107-112,共6页
基金:
国家水体污染控制与治理科技重大专项(2012ZX07101007-005)
关键词:
菹草 萌发 生物学积温
Potamogeton crispus germinate the biological accumulated temperature
分类号:
Q178.1 [生物学—水生生物学]
