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在根系隔离情况下,通过研究邻株身份(亲缘株、非亲缘株、陌生株)及其与种植密度(高、低)和土壤养分水平(高、低)交互作用对谷子(Setaria italica)形态学特征和生物量分配的影响,探索谷子地上部分是否能够识别亲缘邻株,以及谷子的这种亲缘识别能力对环境因子如何响应。结果显示:1)亲缘组谷子叶生物量分配显著降低,茎秆显著增粗,暗示着亲缘组谷子植株间减少竞争,并增强对当地多风气候的适应。而非亲缘组谷子叶生物量分配显著增加,表明非亲缘组谷子植株间竞争较强。2)与非亲缘组相比,陌生组谷子种子生物量分配显著增加,株高显著减少,表明陌生组谷子植株通过不对称竞争(与邻株糜(Panicum miliaceum)植株相比,株高显著增加),进一步限制邻株(糜)生长,从而增强竞争能力,同时,将更多的生物量投资于繁殖,增加适合度。3)在高密度种植条件下,谷子茎生物量和叶生物量分配在各邻株身份处理间无显著差异,而在低密度种植条件下,与非亲缘组相比,亲缘组谷子茎生物量显著增加,叶生物量分配显著减小;随着种植间距的增大(种植密度减小),亲缘组谷子叶生物量分配显著减少,而非亲缘组和陌生组叶生物量分配在高、低种植密度条件下无显著差异。4)在低土壤养分条件下,亲缘组和非亲缘组谷子叶生物量分配无显著差异,前者穗长显著小于后者,而在高土壤养分条件下,亲缘组谷子叶生物量分配显著小于非亲缘组,前者穗长显著大于后者。结果表明,在根系隔离的情况下,谷子能够识别亲缘邻株,且谷子地上部分竞争信号在亲缘识别过程中扮演重要角色。较低种植密度和较高土壤养分水平有利于谷子亲缘识别能力的表达。
In the case of root segregation, the morphological characters of Setaria italica were studied by studying the interaction between the adjacent strains (kin, non-kin and unfamiliar) and their interaction with plant density (high and low) and soil nutrient (high and low) Learning characteristics and biomass allocation to explore whether the aerial part of the millet can identify relatives and how this genetic identification of millet responds to environmental factors. The results showed that: 1) The biomass allocation of millet in the relatives was significantly reduced and the stalks significantly increased, suggesting the competition between the relatives of millet plants was reduced and the adaptability to the local windy climate was enhanced. However, the non-related group significantly increased the biomass allocation of millet leaves, indicating that non-relative group of millet plants strong competition. 2) Compared with non-relatives, the biomass allocation of unfamiliar group of millet increased significantly and the plant height significantly decreased, indicating that the unfamiliar group had asymmetric competition of millet plants (compared with Panicum miliaceum, the plant height was significantly increased ), Further limiting the growth of neighboring strains (Mi), thereby enhancing the competitiveness, at the same time, invest more biomass in breeding, increase the fitness. 3) Under high-density planting conditions, there was no significant difference in the biomass allocation and leaf biomass allocation of millet between adjacent plants. However, under low-density planting conditions, compared with non-relatives, The biomass of the leaves of the relatives decreased significantly while the biomass of the non-relatives and the unfamiliar leaves decreased significantly with increasing planting spacing (decreasing the planting density) There was no significant difference in planting density. 4) Under low soil nutrient conditions, there was no significant difference in biomass allocation between relatives and non-relatives, while the former was significantly shorter than the latter. Under high soil nutrient conditions, the biomass allocation of grain relatives was significantly smaller than that of non-relatives Relative group, the former spike length was significantly greater than the latter. The results showed that in the case of root segregation, millet could identify relatives and the competition signal of millet ground part played an important role in the process of relative identification. Lower planting density and higher soil nutrient levels are favorable for the expression of relatives recognition ability of millet.