TITLE Mechanism of seedling establishment of direct-seeded rice (Oryza sativa L.) under lowland conditions
AUTHOR J. K. Biswas
Bangladesh Rice Research Institute (BRRI), Plant Physiology Division, Gazipur-1701, Bangladesh
M. Yamauchi
Bangladesh Rice Research Institute (BRRI), Plant Physiology Division, Gazipur-1701, Bangladesh
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ABSTRACT The mechanism of seedling establishment under lowland conditions is an important factor for the improvement of direct seeded lowland rice culture. To explore this mechanism, 36-hour-old seedlings of ASD1, IR41996-50-2-1-3, Mahsuri and IR72 were grown in both lowland and drained soil conditions in the IRRI phytotron (29/21°C) for 10 days. The coleoptile tips of the genotypes ASD1 and IR41996-50-2-1-3 were able to penetrate the reduced soil layer to the oxygenated water by 4 days after seeding to allow an O2 transport system to be established. This was followed by the growth of the mesocotyl and first leaf, while the root growth remained inhibited up to 6 days after seeding. ASD1 and IR41996-50-2-1-3 essentially followed the same sequence of growth, but there was an apparent difference in the tolerance of their tissue to oxygen deficit. Mahsuri and IR72 could not elongate their coleoptiles up to the oxygenated water and thus failed to establish prolonged seedling growth under lowland conditions.
KEYWORD Anaerobic stress; Coleoptile; Direct seeded rice; Lowland rice; Mesocotyl; Seedling establishment;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 38 Number 1 January 1997, page 29-32, 4 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China