Effect of GA3 Concentration on Hybrid Rice Seed Production in Indonesia
Pepi Nur Susilawati, Memen Surahman, Bambang S. Purwoko, Tatiek K. Suharsi, Satoto

Abstract
In Indonesia, hybrid rice was developed with three line system however F1 seed production levels are still low. GA3 has been proved increase the seed set through increased of panicle exertion and improved outcrossing. The purpose of this study is to identify the appropriate doses of GA3 in increasing F1seed production. The material comprising both the parental lines (cytoplasmic male sterlity and restorer) of hybrid HIPA 8 (A1 and BP51-1), HIPA 6 (A2 and B8094), HIPA jatim 3 (A6 and PK88) and HIPA 14 SBU (A7 and BH33d-Mr-57-1-2-2). GA3 powder used in the experiment is 90% concentration in four level consentration i.e. 0, 100, 200, 300 ppm. The results showed that GA3 positively increase plant height, stigma exertion, panicle exertion, duration of floret opening, angle of floret opening and panicle length. Increased seed production is 0.2 to 1 t/ha compared to the control (0 ppm GA3). GA3 concentration of 200 ppm gave the best results as indicated by the highest productivity of seed set and yield in all CMS lines were tested.

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