Relationship between Spikelet Number and Dry Matter Production under Saline Soil and Low Solar Radiation Conditions in Two Rice (Oryza sativa L.) Varieties.
スポンサーリンク
概要
- 論文の詳細を見る
Rice (<I>Oryza sativa</I> L.) yield is low under saline soil conditions due to the small number of spikelets per panicle (<I>SN</I>) and there are varietal differences in the sensitivity of <I>SN</I> to soil salinity. This study was carried out to determine whether varietal differences in the sensitivity were attributable to dry matter production under saline soil conditions. A sensitive variety IR28 and a tolerant variety IR4595-4-1-13 were grown in pots filled with sand and submerged in four saline solutions containing 25mM to 150mM sodium chloride (NaCl) from the later stage of spikelet initiation to the panicle emergence stage and compared to plants grown under low solar radiation (30% to 80% of natural radiation) . Control plants were grown without NaCl application under natural solar radiation. Under the saline conditions dry matter increase per shoot (<I>ΔW</I>) was more reduced in IR28 than in IR4595-4-1-13. The percentage of decrease of <I>SN</I> in IR28 was larger than that in IR4595-4-1-13, where the degeneration of spikelets on secondary rachis-branches was the main cause of the decrease of <I>SN</I>. The panicle dry weight at panicle emergence (<I>Wp</I>) was related to <I>SN</I> and the decrease of <I>ΔW</I> was responsible for the small <I>Wp</I> since dry matter distribution to the panicle (<I>Wp/ΔW</I>) did not change. There was almost no accumulation of sodium in panicle, but substantial accumulation was observed in leaf and stem, IR28 being a better accumulator. Under the low solar radiation conditions, though IR4595-4-1-13 maintained higher <I>SN</I>, there were small varietal differences in the response of <I>ΔW, Wp</I> and <I>SN</I>, while <I>Wp/ΔW</I> was enhanced due to the low solar radiation. Therefore, IR4595-4-1-13 was tolerant in terms of <I>SN</I> to soil salinity because a lower sodium concentration in leaves may maintain dry matter production, thus the limited changes in <I>ΔW</I> and <I>Wp</I>, resulting in a limited change in <I>SN</I>.
- 日本熱帯農業学会の論文
日本熱帯農業学会 | 論文
- 貯蔵中のランブータン果実の細胞壁代謝に及ぼす低温障害の影響
- 海南島での永年作物への被陰樹
- 台湾におけるカイラン在来品種群のアイソザイム多型性
- 近赤外分光分析法によるサトウキビ品質評価
- 41. マンゴーの花芽分化に及ぼす2、3の処理の影響について