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高粱是世界上重要的禾谷类作物,具有抗旱、耐盐碱和耐贫瘠等多重抗性。种子出苗率低一直是高粱种植的制约因素之一,给高粱的机械化种植造成很大影响。本研究于2014年选用不同高粱种质进行室内发芽试验,通过设置不同播种深度研究高粱种质出苗率、中胚轴和胚芽鞘长度与覆土深度的关系。结果表明,杂交种发芽率和发芽势均表现出一定程度的正向中亲优势,变幅分别为5.45%~10.18%和9.59%~13.69%;随着播种深度增加,出苗率逐渐下降;播种深度越深中胚轴越长,但对胚芽鞘影响不显著;供试高粱材料不同播深(2cm和6cm)处理的中胚轴长度差与出苗率变化呈显著负相关(R2=-0.7065*),表明中胚轴的伸长能力是不同播种深度处理出苗率变化的重要因素。
Sorghum is an important cereal crop in the world with multiple resistances to drought, salinity and poor infertility. Low seedling emergence rate has been one of the constraints of sorghum planting, which has a great impact on the mechanized planting of sorghum. In this study, we selected different sorghum germplasm for indoor germination test in 2014, and studied the relationship between germination rate, mesocotyl and coleoptile length and soil depth by setting different sowing depth. The results showed that the germination rate and germination potential of the hybrids both showed a certain degree of positive parental progeny, ranging from 5.45% to 10.18% and 9.59% to 13.69%, respectively. The seedling rate decreased as the depth of sowing increased. The deeper the mesophyll, the longer the mesocostal, but had no significant effect on the coleoptile. The length difference between the hypocotyls and the germination rate was significantly negative (R2 = -0.7065 * ), Indicating that the ability of elongation of the mesocosm is an important factor in the variation of seedling emergence rate at different sowing depths.