Effect of Nitrogen Fertilization on Photosynthetic Characters and Dry Matter Production in F_1 Hybrids of Rice (Oryza sativa L.)
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概要
- 論文の詳細を見る
This study was carried out to determine heterosis in different photosynthetic and morphological characters, and to observe photosynthetic ability and dry matter production potentiality of two F_1 hybrids of rice grown in pots supplied with N fertilizer in the normal or double dose. Photosynthetic rate in terms of CO_2 exchange rate (CER), leaf N concentration, SPAD value, soluble protein content and ribulose-1,5-bisphosphate carboxylase (Rubisco) activity was increased significantly by doubling the dose of fertilizer in most parental cultivars and F1 hybrids, but the rate of increase was higher in F_1 hybrids than in their parents. Several morphological parameters were also increased significantly by doubling the dose of fertilizer, but not the percentage of dead leaf blades. The rates of increase of plant height, leaf area and dry matter production were higher in F_1 hybrids. In particular, the rates of increase of total dry matter and root weight were very high in one of the F_1 hybrids. The percentage of dead leaf blades decreased significantly in plants grown with a high dose of fertilizer as a result of higher leaf N concentration. At a normal fertilizer dose, both F_1 hybrids failed to show positive heterosis in most photosynthetic characters. However, positive heterosis was found at a high fertilizer dose. Both F_1 hybrids showed positive heterosis over mid-parent in dry matter production per plant at both fertilizer doses. One of the F_1 hybrids also showed positive heterosis over the better parent. Heterosis in most photosynthetic and morphological characters was increased by increasing the dose of fertilizer. The sufficient supply by doubling the dose of fertilizer increased the leaf N concentration, chlorophyll content, soluble protein content and Rubisco activity in F_1 hybrids, which led to higher positive heterosis in CER. A larger leaf area plus higher CER, especially at a high fertilizer dose, contributed to higher dry matter production in F_1 hybrids of rice.
- 日本作物学会の論文
著者
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MURAYAMA Seiichi
Faculty of Agriculture, University of the Ryukyus
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Sarker M
Faculty Of Agriculture University Of The Ryukyus:(present Address)on-farm Research Division Banglade
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Sarker Mohammad
Faculty of Agriculture, University of the Ryukyus
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Akamine Hikaru
Faculty of Agriculture, University of the Ryukyus
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Nakamura Ichiro
Faculty of Agriculture, University of the Ryukyus
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Murayama Seiichi
Faculty Of Agriculture University Of The Ryukyus
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Murayama Seiichi
Kanagawa Institute Of Technology
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Akamine H
Faculty Of Agriculture University Of The Ryukyus
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Sarker Mohammad
Faculty Of Agriculture University Of The Ryukyus
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Murayama S
Fac.of Agri. Univ.of The Ryukyus
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Murayama Seiichi
Coll .of Agric. Univ. Of The Ryukyus
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Akamine Hikaru
Faculty Of Agriculture University Of The Ryukyus
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Nakamura I
Tribiox Laboratories Ltd.
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