Physiologically mediated self/non-self discrimination in roots
Physiologically mediated self/non-self discrimination in roots
复制标题
DOI：
10.1073/pnas.0306604101
复制
发表时间：
2004-03-16
影响因子：
11.1
通讯作者：
Novoplansky, A
中科院分区：
文献类型：
--
作者：
Gruntman, M;Novoplansky, A
最近的证据表明，根之间存在自我/非自我歧视；然而，其机制仍不清楚。我们比较了水牛插条的生长情况，这些插条是在属于同一生理个体的邻居存在的情况下生长的，彼此分开不同的时期，或者源自同一克隆上的相邻或远程分蘖。结果表明，B. dactyloides 植物能够区分自体和非自体邻居，并且在同一个体的其他根存在的情况下发育出更少和更短的根。此外，一旦来自同一节点的插条被分离，它们就会逐渐彼此疏远，并最终作为遗传外来植物相互关联。结果表明，观察到的自我/非自我歧视是由同一植物上发育的根之间的生理协调介导的，而不是同种异体识别。观察到的生理协调是基于一种尚不清楚的机制，具有重要的生态意义，因为它可以避免与自我的竞争，并将更多的资源分配给其他功能。
Recent evidence suggests that self/non-self discrimination exists among roots; its mechanisms, however, are still unclear. We compared the growth of Buchloe dactyloides cuttings that were grown in the presence of neighbors that belonged to the same physiological individual, were separated from each other for variable periods, or originated from adjacent or remote tillers on the same clone. The results demonstrate that B. dactyloides plants are able to differentiate between self and non-self neighbors and develop fewer and shorter roots in the presence of other roots of the same individual. Furthermore, once cuttings that originate from the very same node are separated, they become progressively alienated from each other and eventually relate to each other as genetically alien plants. The results suggest that the observed self/non-self discrimination is mediated by physiological coordination among roots that developed on the same plant rather than allogenetic recognition. The observed physiological coordination is based on an as yet unknown mechanism and has important ecological implications, because it allows the avoidance of competition with self and the allocation of greater resources to alternative functions.