Preformation in Arctic Polygonum viviparum

北极胎生蓼的形成

• 批准号: 12640621
• 负责人: NISHITANI Satomi
• 金额: $ 1.98万
• 依托单位: Nippon Medical School
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640621/
• 关键词: performation; Polygonum viviparum; phenology; Arctic; フェノロジー; Polygcnum viviparum; 発芽; 耐凍性; 発芽特性

Preformation, organ initiation and development before it functions, and its constraint on the number or leaves that function in a growing season were examined for Arctic Polygonum viviboarum in Ny-Alesund, Svalbard, Norway (790°N,120°E). The number of leaf primordia at the end of growing season was twice the number of leaves that function in a single growing season. The first leaf primordium, whose major function does not seem to be photosynthesis but protection of the inner primordia, was about half the size (blade length) of the 2nd leaf primordium and reached more than 60% of its maximum size. The 2nd leaf primordium was the largest and was about 30% of its maximum size. The experiment in which all the leaves were clipped off at the time of bolting showed that some of the plants responded to clipping by emerging additional leaves. This suggests that the number of leaves that function in a growing season is not determined at the beginning of the growing season. Seasonal pattern of the development in the leaf primordia also supported this possibility. In addition, plants grown under different temperature conditions showed increased number of leaves under higher temperature condition.

对挪威斯瓦尔巴群岛新奥勒松（北纬 790°，东经 120°）的北极蓼（Arctic Polygonum viibiboarum）的预形成、器官启动和功能前的发育及其对生长季节功能的叶片数量的限制进行了研究。生长季节结束时的原基是单个生长季节发挥作用的叶子数量的两倍。第一叶原基的主要功能似乎不是光合作用，而是。内部原基的保护，约为第二叶原基尺寸（叶片长度）的一半，达到其最大尺寸的60％以上，第二叶原基最大，约为其最大尺寸的30％。其中所有叶子在抽苔时都被剪掉，这表明一些植物通过出现额外的叶子来应对剪掉，这表明在生长季节发挥作用的叶子数量并不是在抽苔时决定的。生长季节开始时叶原基发育的季节模式也支持了这种可能性。此外，在不同温度条件下生长的植物在较高温度条件下表现出叶子数量增加。