Physiological superiority of root system of inter-subspecific hybrid rice

【摘要】： <正> Physiology of root system,especially root system activity,is a very important physiological trait of rice,which di-rectly affects rice growth and development of the aerialparts and yield.Inter-subspecific hybrid rice Πyou 2070and Πyou 419,as well as their restorer lines 2070 andZhong419,were used to study physiological traits of riceroot system.Three years research indicated that in-