Relationship between Dry Weight at Heading and the Number of Spikelets on Individual Rice Tillers(Crop Physiology and Ecology)

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概要

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• The objectives of this study were to identify the growth parameters involved in determining the number of spikelets on an individual tiller (ST) and to elucidate how ST is determined in rice (Oryza sativa L.). We examined the correlation of ST with the dry weight (DWT), leaf area (LAT), and the amount of nitrogen (NT) at heading for individual tillers grown under different conditions that were expected to affect spikelet production. In 1999, the japonica rice cultivars "Mineasahi" (short-duration), "Hinohikari" (intermediate-duration), and "Akebono" (long-duration) were transplanted in a paddy field on two different dates (EARLY and LATE). In 2000, Hinohikari was grown under three different treatments (gibberellic acid application, nitrogen topdressing, and thinning of hills at panicle initiation) and without treatment (control). Covariance and partial correlation analyses indicated that ST was positively and essentially correlated with DWT rather than with LAT and NT. The regression of ST on DWT was stable within each cultivar regardless of the treatment, year, tiller order, and number of differentiated spikelets. The slope of the regression was the steepest in the short-duration cultivar. These results suggest that the steep slope is desirable for high-yielding cultivars with large panicles. We conclude that ST is mostly determined by dry matter production of an individual tiller regardless of the number of differentiated spikelets. We present a diagram showing the relationship between dry matter production and the number of differentiated, surviving, and degenerated spikelets on an individual tiller.

• 日本作物学会の論文

著者

• Shiratsuchi Hiroyuki

  National Agricultural Res. Center For Tohoku Region

• Takanashi Jun-ichi

  National Agricultural Research Center For Western Region Fukuyama

• Ohdaira Youichi

  National Agricultural Research Center for Western Region, Fukuyama

• Ohdaira Youichi

  National Agricultural Research Center For Western Region Fukuyama

関連論文

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• Rice Cultivars with Higher Sucrose Synthase Activity Develop Longer Coleoptiles under Submerged Conditions(Crop Physiology & Ecology)
• Development of Rice "Seed-Mats" Consisting of Hardened Seeds with a Cover of Soil for the Rice Transplanter(Crop Physiology & Ecology)
• Relationship between Dry Weight at Heading and the Number of Spikelets on Individual Rice Tillers(Crop Physiology and Ecology)

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