Figure 1.

Growth and reproduction phenotypes of srt1. (A) Phenotype of srt1 at the tillering stage. The parental cultivar MH86 served as the wild-type (WT) control. (B) Phenotypes of srt1 at the ripening stage. The srt1 mutant plant produced only one panicle that was completely sterile. (C) Defective tillers of srt1. Three tillers separated from a wild-type (WT) plant all produced a panicle. Three main culms from three individual srt1 mutant plants all produced no valid tiller. Panicles were formed only in the main culms of srt1. (D) Highlights of the basal portions of stem of a WT tiller and a srt1 main culm. Note adventitious root generated from the basal stem nodes of srt1. (E) Frequency of plants with various numbers of tillers. Note that most of the srt1 plants had no tiller and some had one to four tillers per plant. All the wild-type plants produced more than five tillers per plant.