摘要： 通过对芝麻杂种8809及其亲本(A和B)各器官干物质积累的系统观测,用微机模拟出各自的Logistic生长方程,以最终生长量、平均生长强度和最大生长强度对各器官的优势表现进行动态分析。结果表明,芝麻杂交种及亲本各器官的生长曲线均呈“S”型;除根茎外,杂交种各器官生长曲线拐点均介于两亲本之间,在最终生长量、平均生长强度和最大生长强度方面,杂种均比亲本表现出较强优势,而且杂种整株和营养器官的生长优势比其生殖生长优势更强。在出苗后53～64天之间,杂种生殖生长强度显著高于两亲本。

关键词: 芝麻, 杂种优势, Logistic方程

Abstract: The dry matter accumulation in the organs of a sesame hybrid,cross 8809, and its parents was observed during their growth period in this study,Their Logistic growth equations were simulated with a micro-computer,The dynamic analysis of the heterosis of all organs vras performed by three indexes i,e, the top weight, the average growth rate and the top growth rate, The result showed that growth curves of all organs of the hybrid and the parents were of a +S" shape，and the turning points of the growth curves for the organs except the stem and roots of the hybrid distributed between those of the2 parents, All these three indexes of the hybrid were superior to those of its parents, and the superiority of the whole-plant growth and the vegetative growth was even stronger than that of the reproductive growth,53 to 64 days after emergence of seeds, the reproductive growth rate of the hybrid was significantly higher than those of the parents, and this period was the most important period for the reproductive growth of the hybrid.

Key words: Sesames , Heterosis, Logistic equation