芝麻杂交种生长动态优势的研究

Studies on the Heterosis of the Dynamic Growth of Hybrid Sesame(Sesamum indicum L. )

本试验探讨雄性不育二系杂交种豫芝9号生长动态优势,以双亲和豫芝4号为对照,用Logistic生长方程描述其器官生长及干物质积累等10个性状的增长过程。比较结果表明,豫芝9号生长发育过程具有前快后缓有效生长量大的特点。前期持续时间短,前、中期各器官生长及干物质合成速率快,形态建成早。各器官干重的GR_1、GR_2和GR_g与产量显著正相关。生长后期即灌浆成熟期持续时间长,根系与生殖器官干物质积累快,相应GR_3、GR_r与产量显著正相关。相反器官生长量及营养器官干重增长明显低于对照和双亲,均有利于产量形成。芝麻杂交种这种生长动态优势是其高产适应性强的本质。

Four materials, one hybrid and its two parents and one control variety, were used in this study. The process of growth and dry matter accumulation in different organs were described with logistic growth equations. The result showed that the hybrid developed faster in earlier stages of growth and slower in later stages. Comparing with its parents and the control, the early stage D1 of the hybrid was shorter, The dry matter accumulation rate was faster in GR1, GR2 and GR8 periods. The dry weight of various organs in G1 , G2 and G8 periods were significantly correlated with the yield. But the Grain-filling Stage D3 of the hybrid lasted longer. In GR3 and GRr periods, the dry matter accumulation of the root system and the reproductive organs was faster and they were significantly correlated with the yield. The growth of the vegetative organs of the hybrid, however, was significantly slower than that of the parents and the control. All these are favourable to the formation of yield.