Studies on Male-sterility of Sunflower (Helianthus annuus L.) I. Study on Chemical Emasculation of Sunflower
S. Y. Hsieh and M. C. Chang
The sunflower treated with concentrations of GA (25ppm, 50ppm, 100ppm) and 2,4-D (20ppm, 25ppm, 30ppm) on stage of flower bud formation (the length of bud was 1~1.5 cm) and rosette stage found that 100 ppm GA treated on f.b.f. had a significant effect for male sterility.
Their floret percentage on treatments with 100ppm, 50ppm and 25ppm were 80.1%, 73.3% and 46.3%, respectively, the others had no significant effect for male sterility.