GENETIC-ANALYSIS OF THE COMPLETE MAINTAINER FOR GENETIC-MALE-STERILITY IN UPLAND COTTON

The inheritance of the complete maintainer for Dong A-type genetic-mal e-sterility (GMS) in cotton was controlled by one pair of recessive ma jor genes for male-sterility and polygenic system for pollen-spreading character together. When a dominant major gene for Fertility was pres ent, the action of the polygenic system was concealed and GMS was inhe rited as a qualitative character conditioned by one pair of recessive genes. But when the major genes were homozygous recessive, the polygen ic system manifested modificatory effects on GMS, making GMS plants sp read some pollen or partially fertile. Among the genic effects of poly genic system on pollen-spreading character, additive [d], dominance [h ] and additive x dominance epistasis [j] were all very significant. [d ] and [j] were positive and [h] was negative. This type of genetic mod el is referred to as Major Gene-Polygene Interaction Model in Crops.