Endogenous Levels of Gibberellins in Normal and Male Sterile Anthers of Rice (Oryza sativacv. Nihonmasari)

Endogenous gibberellins in anthers of rice (Oryza sativa, cv. Nihonmasari (normal)) and in male sterile lines derived from Nihonmasari were quantitated by an immunoassay. The content of GA4/7 and the dry weight of the anthers in the normal rice increased rapidly 1–2 days before heading. The content of gibberellins in the male sterile rice were roughly correlated with the pollen developmental stage characteristic of each line.