Response of the leaf photosynthetic rate to available nitrogen in erect panicletype rice (Oryza sativa l.) cultivar, Shennong265

Chihiro Urairi, Yu Tanaka, Yoshihiro Hirooka, Koki Homma, Zhengjin Xu, Tatsuhiko Shiraiwa

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Increasing the yield of rice per unit area is important because of the demand from the growing human population in Asia. A group of varieties called erect panicle-type rice (EP) achieves very high yields under conditions of high nitrogen availability. Little is known, however, regarding the leaf photosynthetic capacity of EP, which may be one of the physiological causes of high yield. We analyzed the factors contributing to leaf photosynthetic rate (Pn) and leaf mesophyll anatomy of Nipponbare, Takanari, and Shennong265 (a EP type rice cultivar) varieties subjected to different nitrogen treatments. In the field experiment, Pn of Shennong265 was 33.8 μmol m−2 s−1 in the high-N treatment, and was higher than that of the other two cultivars because of its high leaf nitrogen content (LNC) and a large number of mesophyll cells between the small vascular bundles per unit length. In Takanari, the relatively high value of Pn (31.5 μmol m−2 s−1) was caused by the high stomatal conductance (gs;.72 mol m−2 s−1) in the high-N treatment. In the pot experiment, the ratio of Pn/Ci to LNC, which may reflect mesophyll conductance (gm), was 20-30% higher in Nipponbare than in Takanari or Shennong265 in the high N availability treatment. The photosynthetic performance of Shennong265 might be improved by introducing the greater ratio of Pn/Ci to LNC found in Nipponbare and greater stomatal conductance found in Takanari.

本文言語English
ページ(範囲)420-426
ページ数7
ジャーナルPlant Production Science
19
3
DOI
出版ステータスPublished - 2016 4 6
外部発表はい

ASJC Scopus subject areas

  • Agronomy and Crop Science

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