Response of Differentiated and Degenerated Spikelets to Top-Dressing, Shading and Day/night Temperature Treatments in Rice Cultivars with Large Panicles

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概要

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• The presence of large panicles enables to reach a sufficient number of surviving spikelets per unit area for further increase of rice yield. However, the response of differentiated and degenerated spikelets to environmental factors in terms of number in cultivars with large panicles has not been elucidated. By aplplying top-dressing at different rates and frequencies, shading, and day/night temperature treatments in pot experiments, we observed the response of the main stem in two cultivars with large panicles: Yangdao 4 (Chinese indica) and Akenohoshi (Japanese japonica-indica hybrid). The results showed that top-dressing increased the number of differentiated spikelets per panicle and decreased the percentage of degenerated spikelets. Consequently, the number of surviving spikelets per panicle increased. Shading increased the percentage of degenerated spikelets, resulting in the decrease of the number of surviving spikelets per panicle. Higher day/night temperature treatments led to a higher percentage of degenerated spikelets. The treatments affected mainly the spikelets on the secondary branches, while the number of spikelets on the primary branches did not change appreciably, irrespective of the presence of differentiated, degenerated, and surviving spikelets. The influence on the number of surviving spikelets per panicle depended on the number of differentiated spikelets. Shading effect on the percentage of degenerated spikelets also depended on the number of differentiated spikelets per panicle. The decrease of the percentage of degenerated spikelets was associated with the increase of the shoot dry weight (SDW) at heading and the ratio of SDW-differentiated spikelets. The SDW and N absorption at heading affected more significantly the number of surviving spikelets compared to the ratio of surviving spikelets-SDW and surviving spikelets-N, respectively. The above results were similar in Akenohoshi and Yangdao 4. In Akenohoshi, the percentage of degenerated spikelets responded much more conspicuously to the change of SDW or the ratio of SDW-differentiated spikelets than that in Yangdao 4. So did the number of surviving spikelets to SDW and N absorption at heading. Akenohoshi showed a higher ratio of surviving spikelets-N than Yangdao 4. These differences may account for the fact that Akenohoshi showed a larger number of surviving spikelets per panicle than Yangdao 4, even at the same levels of SDW and N absorption.

• 社団法人日本土壌肥料学会の論文

著者

• Yoshida Tetsushi

  Faculty of Agriculture, Kochi University

• Yamamoto Yoshinori

  Faculty of Agriculture, Kochi University

• Miyazaki Akira

  Faculty of Agriculture, Kochi University

• Miyazaki A

  Faculty Of Agriculture Kochi University

• Nitta Youji

  School of Agric., Ibaraki University

• Miyazaki Akira

  Faculty Of Agriculture Kochi University

• Yoshida Tetsushi

  Faculty Of Agriculture Kochi University

• Nitta Youji

  School Of Agric. Ibaraki Univ.

• Yamamoto Y

  Faculty Of Agriculture Kochi University

• Yoshida T

  Faculty Of Agriculture Kochi University

• Yamamoto Yoshinori

  Kochi Univ. Kochi Jpn

• Yao Youli

  United Graduate School of Agricultural College, Ehime University

• Yamamoto Yoshinori

  Faculty Of Agriculture Kochi University

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