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Zeatin(Z)and zeatin riboside(ZR)are natu-rally-occurring and predominant transportablecytokinins in some higher plants.In thisstudy,the total contents of Z and ZR weremeasured in grains and roots,respectively,and their relationship with grain filling wereanalyzed.The grain filling percentage(GFP)and fertilized-grain filling percentage(FGFP)of rice cultivars IR72,IR 65600-42-5-2,IR65600-127-2-3,and IR 65598-112-2 grown infield and cultivars IR72,IR57298-174-1-1R,
Zeatin (Z) and zeatin riboside (ZR) are natu-rally-occurring and predominant transportablecytokinins in some higher plants. In this study, the total contents of Z and ZR weremeasured in grains and roots, respectively, and their relationship with grain filling wereanalyzed. The grain filling percentage (GFP) and fertilized-grain filling percentage (FGFP) of rice cultivars IR72, IR 65600-42-5-2, IR65600-127-2-3, and IR 65598-112-2 grown infield and cultivars IR72 , IR57298-174-1-1R,