Abstract
Summary Elongation of intact coleoptiles of rice ( Oryza sativa L.) is markedly promoted by submergence. Abscisic acid (ABA) content in the coleoptiles grown in air and under water was analyzed with gas chromatography- mass spectrometry (GC-MS). The ABA level per unit length was higher in air-grown coleoptiles than in water-grown ones. Similar data were obtained for the level expressed on the basis of whole coleoptiles and the fresh or dry mass. The difference in ABA content between air- and water-grown coleoptiles was especially prominent in the early stage of growth. A significant gradient in the ABA level, with the highest in the tip, was observed for coleoptiles grown in air, but such a gradient was unclear for water- grown ones. These results suggest that the changes in ABA metabolism are involved in the accelerated elongation of rice coleoptiles under submerged conditions.
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