Relative Contribution of Hetero-and Auto-trophic Growth to Genotypic Variation of Seedling Vigor in Rice (Oryza sativa L.)(Crop Physiology and Ecology)
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概要
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To elucidate the major physiological process to cause genotypic variation in the seedling vigor of rice, we analyzed the dry matter accumulation in the seedling for diverse cultivars distinguishing hetero- and autotrophic growth. Four cultivars in Exp. 1 and 63 cultivars in Exp. 2 were grown in a glasshouse by hydroponics for about three weeks. In Exp. 1, heterotrophic dry weight (DW_h) was regressed against thermal time (T, ℃ d) by logistic functions, in which the final heterotrophic dry weight (DW_<h.Max>) was considered the primary determinant of heterotrophic growth rate. The increase of autotrophic dry weight (DW_a, DW_t (total DW)-DW_h) was regressed to the exponential function of T with a fairly stable parameter, relative growth rate (RGR). The variation of DW_t among cultivars and seed-sizes was well represented by combining the DW_h and DW_a models. In Exp. 2, DW_t varied among cultivars from 51 to 116mg pl^<-1>. The effects of cultivar-specific parameters, DW_<h.Max> (final DW_h) and RGR, were evaluated by calculating the standard DW_t with the mean DW_<h.Max> and RGR, and then substituting one of the two cultivar-specific parameters for every cultivar. The results showed that those cultivars whose superior DW_t was attributable to DW_<h.Max> were limited to very large-seed cultivars. If they were excluded, the estimated effect of RGR (autotrophic process) on DW_t was evidently greater than that of DW_<h.Max> (heterotrophic process).
- 日本作物学会の論文
著者
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HORIE Takeshi
Graduate School of Agriculture, Kyoto University
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SHIRAIWA Tatsuhiko
Graduate School of Agriculture, Kyoto University
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Watatsu Eiko
Graduate School of Agriculture, Kyoto University
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Watatsu Eiko
Graduate School Of Agriculture Kyoto University
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Horie Takeshi
Graduate School Of Agriculture Kyoto Univ.
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Shiraiwa Tatsuhiko
Graduate School Of Agriculture Kyoto University
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Shiraiwa Tatsuhiko
Graduate School Of Agriculture Kyoto Univ.
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Shiraiwa Tatsuhiko
Res. Inst. Humanity And Nature Kyoto Jpn
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