【摘要】 <正> 对于小麦的冬、春性类型在遗传上、生理上的差异及对春化和光周期的反应,国内外许多学者做了大量研究。Torao Gotoh等对冬小麦春化反应进行了基因分析。ΓepMaH研究了春性品种光周期反应的形态特征。国内外关于小麦主茎叶数,叶龄与穗分化进程的对应关系、生育阶段的划分也有许多研究。本文是在前人研究的基础上,应用不同类型品种,周年分期播种,研究小麦主茎叶片数及穗分化进程的变异,以探索冬、春性品种叶数及穗分化进程的形态指标,并以此划分生育阶段。更多还原

【Abstract】 The variation patterns of leaf number on main stem and of differentiation process were studied with 17 varieties of wheat, including three types (semi-winter habit, winter habit, and spring habit) during 1980-1982 in Beijing.The main conclusions are as follows:1. The best available method to determine type of habits was based on both the va riation range of leaf number (main stem) and maximum leaf number when the growing points have elongated under different sowing date (through a year) in the field.2. Accoring to the reaction of vegetative growth and reproductive growth to different enviromnent, the period from growing to earing was divided into 3 phases: al Basic vegeta ative growth phase (from germination to the emergency of the third leaf); bl Alterable vegetative growth phase (from the emergency of the third leaf the to growing point mono-ridge) and alierable reproductive growth phase (from the growing point moro-ridge to the latter stage of double-ridge); cl "Synchronous" reproductive growth phase (from the latter stage of double-ridge to earing).更多还原