GENETIC STUDIES ON DROUGHT TOLERANCE INUPLAND COTTON (GOSSYPIUM HIRSUTUM L.)

摘要

A diallel study was carried out during 1998 and 1999 applying the methodology of Hayman (1954) using eight cultivars ofupland cotton and their 28 crosses. The objective of this work was to study the genetic components that control theinheritance of several physiological and agronomic characters under drought conditions. The field experiments were locatedin Seville, southern Spain under limited condition of water. The characters evaluated were: photosynthesis, transpiration,stomatal conductance, water use efficiency, leaf temperature, specific leaf weight, water content, seed cotton yield, bollnumber per plant, boll weight, fibre percentage and seed index. Relationships among traits were determined using Pearson`ssimple correlation test. The genetic analyses showed the importance of the additive genetic variance in the inheritance of thecharacters such as photosynthesis, transpiration, stomatal conductance and water content and the importance of the additiveand non additive genetic variance in the inheritance of yield, boll number per plant and boll weight.