Abstract
Studies on pollen ecology and genetical analyses of flowering characteristics for F1seed production in barley were carried out.
The amount of pollen shed in the daytime was larger than that during the night. The velocity of the wind in the daytime was also higher than during the night. Most of the pollen grains in the daytime flew out and those at night successfully reached the female parent.
In the field of the breeding station, the method to obtain F1seeds with a high purity and limited labor was as follows: the populations of F1seeds were alternately planted in row with male sterile plants and in rows with pollen parents; the populations of F1seeds were enclosed by three rows of rye.
Most of the Japanese cultivars showed cleistogamy and most of the foreign cultivars revealed chasmogamy. The analyses of flowering characteristics in the B1F2generation of the cross, Misato Golden×2/Satsuki Nijo, clearly indicated that the chasmogamy was controlled by a single recessive gene.
As the chasmogamous character is controlled by a single recessive gene, the pollen parents for F1seed production can be easily developed by conventional methods of breeding.
