Developing pollen parents for two-line hybrids

摘要

A pollen parent line is defined as a male parental line that has the ability to restore the fertility in the F1 of the EGMS line under a sterile phase regime that ensures complete male sterility. Most conventional inbred lines are the source of pollen parent lines or pollen parents. For hybrid rice seed production using EGMS, any pollen parent line can restore fertility in the F1, unlike CMS lines, for which a set of restorer lines alone can restore fertility in the F1. It was estimated that about 97% of the japonica and indica inbred lines restored the fertility of japonica PGMS (such as Nongken 58S) and indica TGMS (such as W6154S) lines.