1Department of Plant Physiology, College of Agriculture, Indira Gandhi Krishi Vishwavidalaya, Raipur – 492 012 (C.G.) India
2Department of Genetics and Plant, Breeding College of Agriculture, Indira Gandhi Krishi Vishwavidalaya, Raipur – 492 012 (C.G.), India
Online published on 19 November, 2015.
A segregating population of 62 lines derived from a cross between IR42253/Abhaya-F9 and Swarna/IR42253-F4 and improved genotypes Abhaya, IR42253, Mahamaya, Safri, Poornima, Dagad Deshi, and IR-64 were investigated during Kharif 2004. The material was divided into two sub groups i.e., tall and dwarf. Studies on evaluation of physiological and yield determinants of tall and dwarf breeding lines of rice revealed that genetic information of tall cultivars into modern semi dwarf or dwarf cultivars has led to modification in various morpho-physiological traits. Reduction in vertical growth (plant height) caused several secondary morpho-physiological traits in rice and in turn leads to higher sink potential. Yield improvement of dwarf lines was mainly due to marked improvement in their biomass conversion efficiency into grain without disturbing the biological yield.
Breeding lines, Dwarf rice, Tall rice and Rainfed rice
