Morphological and physiological change of rice (Oryza sativa L.) under water stress at early season

Abstract Water stress is a major factor affecting rice production. causes changes in physiology and morphology for plant tolerance to water stress. In this study, six varieties were examined their The check comparisons of tolerant, moderate tolerant sensitivity stress, namely Situ Patenggang, Towuti IR 64; while the test study are three Aceh traditional varieties. significantly influences number tillers, length internode, proline, chlorophyll a, b total content, leaf rolling, drying score recovery, which occur varies among varieties, vegetative stages. Chlorophyll main indicator drought early season growing season. Varieties that have good adaptation able maintain content. Leaf recovering from show small difference between comparative stage. To overcome it necessary change cultivation by adjusting planting time, season, using national superior varieties; irrigation fertilization management.