Self/non-self discrimination in roots
Self/non-self discrimination in roots
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DOI：
10.1046/j.1365-2745.2003.00795.x
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发表时间：
2003-08-01
影响因子：
5.5
通讯作者：
Novoplansky, A
中科院分区：
文献类型：
--
作者：
Falik, O;Reides, P;Novoplansky, A
1竞争通常涉及将有限的资源分配给非生殖功能。预计自然选择将有利于增加与非自我邻居的竞争并限制与自我的浪费竞争的机制。2我们使用了具有两个根的豌豆植物和具有两个芽和两个根的“双植物”，其可以纵向分离成两个遗传上相同但生理上不同的个体或保持完整。根植物的邻居属于不同的植物。此外，根的发展是相对较大的存在下，根的不同的植物，无论其身份。这种区分有一个矢量成分，即植物向不同植物的相邻根比向同一植物的其他根发展更多和更长的侧根。同一植物的不同器官之间的排序，而不是依赖于遗传差异的他化识别。而非自体可以提高植物的资源利用效率和生态性能。也可以预期，紧密的生理协调将被选择用于同一植物的器官之间，这些器官具有更大的可能性参与彼此的直接竞争相互作用。
1 Competition usually involves the allocation of limiting resources to non-reproductive functions. Natural selection is expected to favour mechanisms that increase competition with non-self neighbours and limit wasteful competition with self.2 We used Pisum sativum plants that had two roots and 'double plants' with two shoots and two roots that could be either longitudinally separated into two genetically identical but physiologically distinct individuals or left intact.3 Root development was significantly greater in split-root plants whose neighbours belonged to different plants. Furthermore, root development was relatively greater in the presence of roots of a different plant, regardless of its identity. This discrimination had a vectorial component whereby plants developed more and longer lateral roots towards neighbouring roots of different plants than towards other roots of the same plant.4 The results thus demonstrate a mechanism of avoiding self-competition that is based on physiological co-ordination among different organs of the same plant rather than on allochemical recognition that depends on genetic differences.5 The ability to discriminate between self and non-self could be expected to increase resource use efficiency and ecological performance in plants. It could also be expected that tight physiological co-ordination will be selected for between organs of the same plant that have greater probability of being engaged in direct competitive interactions with each other.