Kandungan Zat Pengatur Tumbuh Daun dan Pola Infloresen Bunga pada Jarak pagar (Jatropha curcas L.) Andromonoecious

Abstract

Jatropha curcas is a monoecious plant with separated male and female flowers. However, there is also andromonoecious Jatropha plant that produce hermaphrodite and male flowers. One of the internal factors controlling reproductive phase is Plant Growth Regulators (PGRs). Addition of PGRs could optimize vegetative and reproductive phase. The aims of this study were to analysis the content of leaf auxins, gibberellins, and cytokinins, as well as flower inflorescense pattern on andromonoecious Jatropha curcas under PGR treatments. PGRs IAA, GA3, and kinetin was sprayed to leaves every two weeks until two months before flowering. PGR analysis was performed using extraction and spectrophotometric methods. The content of auxins and gibberellins in monoecious Jatropha were higher when was analyzed before flowering than that of after flowering, whereas the content of sitokinin on monoecious plant was lower before flowering than that of after flowering. Auxin and sitokinin content in non treated andromonoecious increased after flowering. whereas gibberellins content decreased. Treatment of 100 ppm auxin and giberellin to the andromonoecious Jatropha could increase the content of PGR endogenous. Kinetin increased number of flower inflorescense on andromonoecious Jatropha.