Abstract
Effects of gibberellic acid (GA) on the plant height, with special emphasis on the pattern of internode elongation of single-gene semi-dwarf rice was studied. Four japonia type varieties together with 15 dwarf strains induced by irradiation were treated with 500 ppm of GA water solution. The seeding height of the majority of strains tested was found to he repressed, while about 30% of the strains showed the promotive response to GA treatment. The degree of GA effect on internode elongation was increased as the number of treatment was increased, showing that there is an accumulative effects. It was found that the effect of GA was more prominent when it was treated at tillering, panicle formation and heading stages. Some GA treated dwarf mutants showed the normal plant height and agronomic characters as those of original normal plant, in revertant type appearance. Internode No.4 which is at the basal part of the plant was most sensitive to GA. The degree of increase in internode length is up to 2.2-26 times of untreated one. Internode No.2 and No.3 are the next sensitive to response to GA. It is therefore considered that these three internodes are more easily affected by both genetic and environmertal factors. They could be subjected to selection during the course of breeding for dwarfstatured variety.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
