Plant Production Science
Online ISSN : 1349-1008
Print ISSN : 1343-943X
Crop Physiology and Ecology
Relative Contribution of Hetero- and Auto-trophic Growth to Genotypic Variation of Seedling Vigor in Rice (Oryza sativa L.)
Tatsuhiko ShiraiwaEiko WatatsuTakeshi Horie
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ジャーナル フリー

2006 年 9 巻 2 号 p. 133-140

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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 auto-trophic 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 (DWh) was regressed against thermal time (T,°C d) by logistic functions, in which the final heterotrophic dry weight (DWh.Max) was considered the primary determinant of heterotrophic growth rate. The increase of autotrophic dry weight (DWa, DWt (total DW)-DWh) was regressed to the exponential function of T with a fairly stable parameter, relative growth rate (RGR). The variation of DWt among cultivars and seed-sizes was well represented by combining the DWh and DWa models. In Exp. 2, DWt varied among cultivars from 51 to 116 mg pl-1. The effects of cultivar-specific parameters, DWh.Max (final DWh) and RGR, were evaluated by calculating the standard DWt with the mean DWh.Max and RGR, and then substituting one of the two cultivar-specific parameters for every cultivar. The results showed that those cultivars whose superior DWt was attributable to DWh.Max were limited to very large-seed cultivars. If they were excluded, the estimated effect of RGR (autotrophic process) on DWt was evidently greater than that of DWh.Max (heterotrophic process).

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© 2006 by The Crop Science Society of Japan
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