Hautekèete N-C, Piquot Y, Van Dijk H
Laboratoire de Génétique et Évolution des Populations Végétales UPRESA CNRS 8016, bâtiment SN2, Université de Lille 1, F-59655 Villeneuve d'Ascq Cedex, France.
New Phytol. 2002 Jun;154(3):641-650. doi: 10.1046/j.1469-8137.2002.00427.x.
• Removal of developing fruits delays ageing in many annual plant species. This has long been seen as evidence that ageing is caused by resource depletion due to fruit development. Excision experiments can be interpreted from both evolutionary-ecology and resource-allocation viewpoints. Iteroparous (reproducing repeatedly) and annual plants may show different responses to excision. Furthermore, under the resource-depletion hypothesis, the more precocious the excision of reproductive organs, the greater the effect on allocation patterns. • A controlled-conditions experiment was set up involving six life cycles (from long-lived iteroparous to annual taxa of wild beets, Beta spp.) under three treatments of excision of reproductive-parts (buds, fruits and control). • Treatment effect was similar in semelparous and iteroparous beets, although effect on reproduction was more obvious in iteroparous ones. Flower-bud removal tended to induce resource allocation in new reproductive meristems, whatever the life cycle, without any effect on ageing in semelparous beets and probably none on survival in most iteroparous plants. Fruit removal had no effect. • These results and the occurrence of between-accessions variation are discussed in terms of the ecological significance of optimal allocation strategies.
• 摘除发育中的果实会延缓许多一年生植物物种的衰老。长期以来，这一直被视为衰老由果实发育导致资源耗竭所引起的证据。切除实验可以从进化生态学和资源分配的角度进行解读。多年生（多次繁殖）植物和一年生植物对切除可能会表现出不同的反应。此外，在资源耗竭假说下，生殖器官切除得越早，对分配模式的影响就越大。
• 开展了一项在控制条件下的实验，涉及六个生命周期（从多年生到一年生的野生甜菜类群，即甜菜属物种），设置了三种生殖器官切除处理（芽、果实和对照）。
• 一次性结实和多年生甜菜的处理效果相似，尽管对多年生甜菜的繁殖影响更为明显。摘除花芽往往会促使新的生殖分生组织进行资源分配，无论生命周期如何，对一次性结实甜菜的衰老没有影响，对大多数多年生植物的存活可能也没有影响。摘除果实则没有效果。
• 从最优分配策略的生态意义角度讨论了这些结果以及不同种质间变异的发生情况。
