Heterosis in Numbers of Differentiated, Degenerated, and Surviving Spikelets and Their Relations to the Dry Matter Production in F_1 Hybrids of Rice

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概要

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• Heterosis in the number of differentiated, degenerated, and surviving spikelets in two important Chinese F_1 hybrids Shanyou 63 (SY63) and Yayou 2 (YY2) and their parents was observed under solution culture conditions. The results indicated that the number of differentiated, degenerated, and surviving spikelets all showed a very high value for mid-parental (MP) heterosis in the hybrids at both panicle and plant levels. The increase in the number of surviving spikelets primarily depended on that of the number of differentiated spikelets. The percentage of degenerated spikelets showed a positive value for MP and higher-parental (HP) heterosis (increase) in SY63, while it showed a negative value for MP and HP heterosis (decrease) in YY2. Morphologically, the components of the number of surviving spikelets increased in the hybrids, especially the number of surviving secondary rachis branches. Dry matter production at heading showed a high value for MP and HP heterosis. However, the ratio of dry matter weight to the number of differentiated spikelets did not show a MP heterosis. The hybrids showed a lower percentage of degenerated spikelets for the same ratio of dry matter weight to the nulnber of differentiated spikelets. The N uptake in the hybrids showed a MP and HP heterosis, but the efficiency of the N in producing the number of surviving spikelets showed a negative value for MP and HP heterosis. The MP and HP heterosis in the sink-source ratio of the number of surviving spikelets to the leaf area varied considerably with the combinations. These findings suggested that still many characters could be further improved in F_1 hybridrice.

• 社団法人日本土壌肥料学会の論文

著者

• 山本 幸男

  Faculty Of Agriculture Kochi University

• 山本 幸男

  Research Institute For Bioresources Okayama University

• Yoshida Tetsushi

  Faculty of Agriculture, Kochi University

• Yamamoto Yoshinori

  Faculty of Agriculture, Kochi University

• Miyazaki Akira

  Faculty of Agriculture, Kochi University

• Wang Y

  Key Lab Of Crop Genetics And Physiology Of Jiangsu Province Yangzhou University

• Wang Yulong

  Key Lab. Of Crop Genetics & Physiology Of Jiangsu Province Yangzhou Univ.

• Miyazaki A

  Faculty Of Agriculture Kochi University

• Yamamoto Y

  Okayama Univ.

• Yamamoto Y

  Department Of Biological Production Faculty Of Bioresource Sciences Akita Prefectural 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

• Wang Yulong

  Agricultural College, Yangzhou University

• Cai Jianzhong

  Agricultural College, Yangzhou University

• Cai Jianzhong

  Agricultural College Yangzhou University

• Yamamoto Yoshinori

  Faculty Of Agriculture Kochi University

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