Seedling establishment is one of the most important agronomic traits in direct seeding rice cultivation. We investigated the effects of two plant growth regulators (PGRs), gibberellic acid (GA3) and ethephon (ET), on seedling growth under flooded soil conditions. Seedling growth was increased by a single treatment of GA3 or ET over that of the control. However, effects of combined applications of GA3 and ET were more pronounced than that of GA3 or ET alone at both growing temperatures (15 and 20°C). The growth of different organs of rice seedlings, such as coleoptiles, first leaves and second leaves were also increased by PGR treatment. No significant differences were found in nitrogen concentration and the ratio of shoot dry weight to shoot length of the seedlings among the treatments. Taken together, a high seedling establishment rate in direct seeding cultivation in the cold regions of Japan will be possible by using proper combinations of PGRs.
Seedling establishment is one of the most important agronomic traits in direct seeding rice cultivation. We investigated the effects of two plant growth regulators (PGRs), gibberellic acid (GA3) and ethephon (ET), on seedling growth under flooded soil conditions. Seedling growth was increased by a single treatment of GA3 or ET over that of the control. However, effects of combined applications of GA3 and ET were more pronounced than that of GA3 or ET alone at both growing temperatures (15 and 20°C). The growth of different organs of rice seedlings, such as coleoptiles, first leaves and second leaves were also increased by PGR treatment. No significant differences were found in nitrogen concentration and the ratio of shoot dry weight to shoot length of the seedlings among the treatments. Taken together, a high seedling establishment rate in direct seeding cultivation in the cold regions of Japan will be possible by using proper combinations of PGRs.
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