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Bud Composition Branching Patterns and Leaf Phenology in Cerrado Woody Species

机译:塞拉多木本植物的芽组成分支模式和叶片物候

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摘要

• Background and Aims Plants have complex mechanisms of aerial biomass exposition, which depend on bud composition, the period of the year in which shoot extension occurs, branching pattern, foliage persistence, herbivory and environmental conditions.• Methods The influence of water availability and temperature on shoot growth, the bud composition, the leaf phenology, and the relationship between partial leaf fall and branching were evaluated over 3 years in Cerrado woody species Bauhinia rufa (BR), Leandra lacunosa (LL) and Miconia albicans (MA).• Key Results Deciduous BR preformed organs in buds and leaves flush synchronously at the transition from the dry to the wet season. The expansion time of leaves is <1 month. Main shoots (first-order axis, A1 shoots) extended over 30 d and they did not branch. BR budding and foliage unfolds were brought about independently of inter-annual rainfall variations. By contrast, in LL and MA evergreen species, the shoot extension rate and the neoformation of aerial organs depended on rainfall. Leaf emergence was continuous for 2–6 months and lamina expansion took place over 1–4 months. The leaf life span was 5–20 months and the main A1 shoot extension happened over 122–177 d. Both evergreen species allocated biomass to shoots, leaves or flowers continuously during the year, branching in the middle of the wet season to form second-order (A2 shoots) and third-order (A3 shoots) axis in LL and A2 shoots in MA. Partial shed of A1 shoot leaves would facilitate a higher branching intensity A2 shoot production in LL than in MA. MA presented a longer leaf life span, produced a lower percentage of A2 shoots but had a higher meristem persistence on A1 and A2 shoots than LL.• Conclusions It was possible to identify different patterns of aerial growth in Cerrado woody species defined by shoot-linked traits such as branching pattern, bud composition, meristem persistence and leaf phenology. These related traits must be considered over and above leaf deciduousness for searching functional guilds in a Cerrado woody community. For the first time a relationship between bud composition, shoot growth and leaf production pattern is found in savanna woody plants.
机译:•背景和目的植物具有复杂的空中生物量暴露机制,这取决于芽的成分,一年中发生枝条扩展的时期,分支模式,枝叶持久性,草食性和环境条件。•方法水分和温度的影响在3年中,对Cerrado木本物种紫荆花(BR),Leandra lacunosa(LL)和Miconia albicans(MA)的芽生长,芽组成,叶片物候以及部分叶落与分支之间的关系进行了评估。结果从干旱到湿润的过渡期,落叶中BR在芽和叶中形成的器官同步潮红。叶子的膨胀时间小于1个月。主枝(一级轴,A1枝)延伸超过30 d,并且没有分支。 BR萌芽和枝叶展开是独立于年际降雨变化的。相比之下,在LL和MA常绿树种中,枝条伸长率和气生器官的新形成取决于降雨。叶片出芽持续2–6个月,叶片扩张持续1-4个月。叶片寿命为5–20个月,主要的A1枝延长发生在122–177 d。这两种常绿树种都在一年中连续地向枝,叶或花分配生物量,在雨季的中间分支,从而在LL和MA的A2枝中形成二阶(A2枝)和三阶(A3枝)轴。与 MA相比,LL上部分脱落的A1芽叶将促进LL更高的分支强度A2芽的产生。 MA 的叶片寿命更长,产生的A2芽的百分比更低,但与 LL 相比,A1和A2芽的分生组织持久性更高。•结论可以确定由芽链接性状(例如分支模式,芽组成,分生组织持久性和叶片物候)定义的塞拉多木本植物空中生长的不同模式。在Cerrado木本植物群落中寻找功能性行会时,必须考虑落叶落叶以上的这些相关性状。首次在热带稀树草原木本植物中发现芽组成,芽生长和叶片生产模式之间的关系。

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