Beijing Key Laboratory of Biodiversity and Organic Farming, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
New Phytol. 2018 Oct;220(2):567-578. doi: 10.1111/nph.15296. Epub 2018 Jun 29.
Kin recognition is an important mediator of interactions within individuals of a species. Despite increasing evidence of kin recognition in natural plant populations, relatively little is known about kin recognition in crop species where numerous cultivars have been generated by artificial selection. We identified rice (Oryza sativa) cultivars with the ability for kin recognition from two sets of indica-inbred and indica-hybrid lines at different levels of genetic relatedness. We then assessed this ability among kin and nonkin and tested potential mechanisms in a series of controlled experiments and field trails. Rice cultivars with the ability for kin recognition were capable of detecting the presence of kin and nonkin and responded to them by altering root behavior and biomass allocation, particularly for grain yield. Furthermore, we assessed the role of root exudates and found a root-secreted nitrogen-rich allantoin component to be responsible for kin recognition in rice lines. Kin recognition in rice lines mediated by root exudates occurs in a cultivar-dependent manner. Rice cultivars with the ability for kin recognition may increase grain yield in the presence of kin. Such an improvement of grain yield by kin recognition of cultivar mixtures offers many implications and applications in rice production.
亲缘识别是物种内个体相互作用的一个重要调节因素。尽管越来越多的证据表明自然植物群体中存在亲缘识别，但对于通过人工选择产生的大量品种的作物物种中的亲缘识别，人们知之甚少。我们从两个不同遗传相关水平的籼稻自交系和籼稻杂交系中鉴定出具有亲缘识别能力的水稻品种。然后，我们在一系列控制实验和田间试验中评估了亲缘和非亲缘之间的这种能力，并测试了潜在的机制。具有亲缘识别能力的水稻品种能够检测到亲缘和非亲缘的存在，并通过改变根系行为和生物量分配来对其做出反应，特别是对籽粒产量。此外，我们评估了根分泌物的作用，并发现根分泌的富含氮的尿囊素成分是水稻品系中亲缘识别的原因。由根分泌物介导的水稻品系中的亲缘识别以品种依赖性的方式发生。具有亲缘识别能力的水稻品种在有亲缘的情况下可能会增加籽粒产量。这种通过品种混合物的亲缘识别来提高籽粒产量的方法在水稻生产中具有许多意义和应用。
