LIFE-HISTORY VARIATION IN THE ANNUAL ARABLE WEED DIPLOTAXIS ERUCOIDES (CRUCIFERAE)
LIFE-HISTORY VARIATION IN THE ANNUAL ARABLE WEED DIPLOTAXIS ERUCOIDES (CRUCIFERAE)
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DOI：
10.1139/b94-003
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发表时间：
1994-01-01
期刊：
影响因子：
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通讯作者：
MASALLES, RM
中科院分区：
文献类型：
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作者：
SANS, FX;MASALLES, RM
在生活史性状的变化，如出现，生存，开花时间，繁殖力进行了研究，在Diplotaxis ercoides，地中海冬季一年生杂草，通过分析队列出现在秋季，早春，春季。植物对环境的反应，反映在植物的结构和生物量分配模式，也进行了研究。秋季发芽的幼苗比春季发芽的种子多3到10倍。影响种子数量的主要因素似乎是寿命。生长期的缩短导致模块单元的数量和长度减少，从而导致每个模块的叶、花和果实的数量减少。在单生D.在芸苔属植物中，生物量分配到繁殖的模式的差异与植物大小有关。我们的现场数据表明，增加的生殖努力与大小发生在小的个人，但是，减少发生的营养生物量大于2克，小于5克。当营养生物量大于5g时，生殖努力几乎没有变化。从策略的角度看，D. erucoides可以被解释为一种很好的策略，有利于更高比例的资源用于小个体的繁殖，从而确保一些后代。然而，结构，发育和生理的限制导致稳定，甚至减少生殖努力超过一定的阈值大小，当生产的后代已经得到保证。
Variation in life-history traits such as emergence, survival, time of flowering, and fecundity were studied in Diplotaxis ercoides, a mediterranean winter annual weed, by analyzing cohorts that emerged in autumn, early spring, and spring. The response of the plants to the environment, as reflected by plant architecture and pattern of biomass allocation, was also studied. Seedlings that germinate in autumn produced from 3 to 10 times more seeds than those that germinated in spring. The main factor affecting the number of seeds produced appears to be the life-span. Reduction of the growing period led to a decrease in both number and length of modular units, which resulted in decreased numbers of leaves, flowers, and fruits of each module. In semelparous D. erucoides plants, differences in the pattern of biomass allocation to reproduction are related to plant size. Our field data indicate that an increase of reproductive effort with size occurs in small individuals; however, a decrease occurs for vegetative biomass greater than 2 g and less than 5 g. Little variation in reproductive effort occurs when vegetative biomass is greater than 5 g. From a strategic point of view, size-dependent variation of reproductive effort in D. erucoides can be interpreted as good tactics to favour a higher proportion of resources devoted to reproduction in small individuals, thus ensuring some offspring. However, structural, developmental, and physiological constraints lead to stabilization or even a decrease in reproductive effort above a certain threshold size, when production of offspring is already ensured.