Geigeria alata in the Namib desert: seed heteromorphism in an extremely arid environment
Geigeria alata in the Namib desert: seed heteromorphism in an extremely arid environment
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DOI：
10.2307/3236345
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发表时间：
1995-08
影响因子：
2.8
通讯作者：
A. Burke
中科院分区：
文献类型：
--
作者：
A. Burke
研究了纳米布沙漠一年生地瓜种子异型性与环境条件的关系。随着种子在亲本植株上的位置不同，其传播距离呈现异型性。在枝条（空中）的头状花序中产生的种子可以传播很远的距离，而在植物基部产生的种子则留在亲本植物附近。根据不同的干旱梯度，研究了不同环境条件下地生种子与基生种子的比例。种子和头状花序的产量在不同季节和植株不同位置之间存在显著差异，但总体上没有随着干旱程度的增加而增加的趋势。
Seed heteromorphism in annual Geigeria alata in the Namib Desert was investigated in relation to environmen- tal conditions. Geigeria alata shows heteromorphism in seed dispersal distance depending on the position of the seeds on the parent plant. Seeds produced in capitula on branches (aerial) travel long distances, while seeds produced at the base of the plant remain in the vicinity of the parent plant. The ratio of aerial to basal seed production was investigated under different environmental conditions following an aridity gradi- ent. Although there were significant differences in seed and capitula production between seasons and between different positions on the plant, no overall trend was found with increas- ing aridity.