Root System Development of Cassava and Sweetpotato during Early Growth Stage as Affected by High Root Zone Temperature
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概要
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Root zone temperature (RZT) is an important factor that affects the establishment of crops in the field. This study was conducted to determine the effect of high RZT on the root system development of cassava and sweetpotato and to assess the response of each root system component of cassava and sweetpotato to high RZTs. Cassava and sweetpotato are widely grown crops in soils that are prone to reach a high temperature especially during the dry season. The plant root system was the primary object of investigation in this study. Cassava and sweetpotato cuttings were grown in pots for 20 days in a growth chamber where two different soil temperature regimes were maintained : 40℃ (high RZT) and 25℃ (normal). High RZT significantly decreased the total length of the adventitious roots (ARs) and the number and total length of the first order lateral roots (LRs) in both cassava and sweetpotato. Reduction in these root growth parameters was greater in the latter than in the former. High RZT caused a marked increase in the number of the second order LRs in sweetpotato and tended to enhance the formation of the third order LRs. Under high RZT, in cassava, a higher proportion of the total number of ARs and the first order LRs, and thus, a greater fraction of the total root length came from the lower nodes of the cuttings that were buried deep in the soil at planting. In sweetpotato, a greater proportion of the total number and total length of the ARs and the first order LRs was observed in the nodes of the cuttings that were buried closer to the soil surface than those buried deeper. An opposite trend was evident in both cassava and sweetpotato grown under a normal RZT. In the screenhouse experiment where plants were grown for 12 days, root growth of cassava was significantly reduced by the high RZT that prevailed when the soil was not covered with mulch materials. The root development in the mulched soil was similar to that under normal RZT in the growth chamber.
- 日本作物学会の論文
著者
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Iijima Morio
Graduate School of Bioagricultural Sciences, Nagoya University
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Yamauchi Akira
Graduate School of Bioagricultural Sciences, Nagoya University
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Banoc D
Nagoya Univ. Nagoya Jpn
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Banco Dionisio
Graduate School Of Bioagricultural Sciences Nagoya University
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Iijima Morio
Graduate School Of Bioagricultural Sciences Nagoya University
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Yamauchi Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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Banoc Dionisio
Graduate School of Bioagricultural Sciences, Nagoya University
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Pardales Jose
Philippine Root Crop Research & Training Center
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Kono Yasuhiro
Graduate School of Bioagricultural Sciences, Nagoya University
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Pardales J
Philippine Root Crop. Res. And Training Center Leyte Phl
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Kono Yasuhiro
Graduate School Of Bioagricultural Sciences Nagoya University
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