Reactive shifts in the pattern of resource allocation in three Lolium species with different levels of persistency under clipping disturbance.
Reactive shifts in the pattern of resource allocation in three Lolium species with different levels of persistency under clipping disturbance.
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DOI：
10.1111/j.1744-697x.2009.00157.x
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发表时间：
2009-12
影响因子：
1.3
通讯作者：
Yukiko Aoyagi;M. Akimoto
中科院分区：
文献类型：
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作者：
Yukiko Aoyagi;M. Akimoto
植物生长的持续性与资源配置方式密切相关；然而，植物往往会根据其生长条件改变资源配置模式。研究了不同持久性植物的资源分配模式对落叶的响应，选取了三种黑麦草：一年生黑麦草；多花百合（主要一年生但偶尔越冬）；和L. perenne（多年生）。我们将这三种植物的地上部分切除约70%，对其进行修剪处理，并将修剪后的植株与完整对照的生长模式进行比较。不同持续性的黑麦草种类对剪枝处理的资源分配有不同的反应规范。剪短后，乳黄和何乐莲维持了生殖分蘖和种子生产力的比例，增加了用于生殖器官发育的资源投入，弥补了用于营养器官发育的资源分配损失。一年生物种，只能通过种子繁殖，可能提高种子产量，以确保在不良条件下以营养生长为代价的再生。与此相反，刈割处理使多年生羊草在叶片发育上投入了更多的资源，减少了种子产量。能够承受不利影响的多年生植物可能会将相当一部分资源分配给营养生长以确保生存。在恒叶和每穗种子产量方面，何乐莲表现出与多年生相似的再生习性，但与乳苗不同。这可能是因为前两个物种有共同的祖先。
Persistency of plant growth is closely related to the manner of resource allocation; however, plants often shift the pattern of resource allocation depending on their growth condition. We examined how the plants with different levels of persistency change their resource allocation patterns in response to defoliation using three Lolium species: L. temulentum (annual); L. multiflorum (predominantly annual but occasionally overwinter); and L. perenne (perennial). We subjected the plants to clipping treatment by excising approximately 70% of the aboveground body parts of the plants from the three species, and compared the growth pattern of clipped plants with that of the intact controls. Lolium species with different persistency have developed different reaction norms for resource allocation to clipping treatment. After clipping, L. temulentum and L. multiflorum maintained the proportion of reproductive tillers and seed productivity resulting in an increase in the resource investment in the development of reproductive parts, which was compensated with the loss of allocation to the development of vegetative parts. Annual species, which can propagate themselves only through seed generation, possibly enhanced seed production to ensure regeneration under undesirable condition at the cost of vegetative growth. In contrast, L. perenne invested more resources in foliage development by reducing seed production in response to clipping treatment. Perennial plants that can endure adverse effects possibly allocate substantial portion of the resources to vegetative growth for ensuring survival. L. multiflorum showed similar regrowth habits with respect to the constant foliage and seed production per panicle as those of L. perenne, but differed from those of L. temulentum. This may be because the two former species have common ancestors.