水稲品種オオチカラ由来の短根性準同質遺伝子系統IL-srt1の施肥窒素量と 栽植密度に対する生育反応

日本作物学会紀事

辺 嘉賓¹  趙 仁貴²  劉 建¹  塩津 文隆¹  楠谷 彰人³  豊田 正範³  諸隈 正裕³ 

[1] 愛媛大学大学院連合農学研究科;吉林農業大学農学院;香川大学農学部

关键词: Near isogenic line;    準同質遺伝子系統;    Nitrogen;    窒素;    Planting density;    栽植密度;    Rice;    イネ;    Root system;    根系;    Short-root;    短根;   

DOI  :  10.1626/jcs.78.203

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The rice cultivar Oochikara and its short root near isogenic line IL-srt1 were grown at different planting densities and under different nitrogen fertilizer regimes to reveal the effect of short root on the growth of rice plant through the comparison of growth responses between the cultivar and the line. In both Oochikara and IL-srt1, shoot dry weight (SDW) per hill and spike number per hill (SN) lineally decreased with increasing planting density and lineally increased with increasing nitrogen supply. The SDW per hill and SN of IL-srt1 grown at low planting densities or under high nitrogen regimes sometimes exceeded those of Oochikara grown at high planting densities or under low nitrogen regimes. The SDW per hill was closely correlated with SN rather than SDW per stem in both experiments. On the other hand, the SDW per hill and SN were significantly correlated with the root length per hill (RL) in the density experiments, but not in the nitrogen experiments. The differences in SDW per hill and SN between Oochikara and IL-srt1 tended to increase with decreasing planting density, probably because the difference in the size of rooting zone increased with decreasing planting density. In nitrogen experiments, however, the differences in SDW per hill and SN between Oochikara and IL-srt1 were about the same under all nitrogen regimes, probably because the pot size limits the elongation of root. These results suggested that the short root and its narrow rooting zone limit the SDW per hill and SN by affecting tiller survival through suppression of water and nutrient supply.

【 授权许可】

Unknown