A High-Yielding Rice Cultivar "Takanari" Shows No N Constraints on CO2 Fertilization

被引:32
作者
Hasegawa, Toshihiro [1 ]
Sakai, Hidemitsu [2 ]
Tokida, Takeshi [2 ]
Usui, Yasuhiro [3 ,4 ]
Nakamura, Hirofumi [5 ]
Wakatsuki, Hitomi [2 ]
Chen, Charles P. [6 ]
Ikawa, Hiroki [2 ]
Zhang, Guoyou [1 ]
Nakano, Hiroshi [7 ]
Matsushima, Miwa Yashima [8 ]
Hayashi, Kentaro [2 ]
机构
[1] Natl Agr & Food Res Org, Tohoku Agr Res Ctr, Morioka, Iwate, Japan
[2] Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki, Japan
[3] Natl Agr & Food Res Org, Res Ctr Agr Informat Technol, Tsukuba, Ibaraki, Japan
[4] Natl Agr & Food Res Org, Hokkaido Agr Res Ctr, Memuro, Hokkaido, Japan
[5] Tayo Keiki Co Ltd, Toda, Saitama, Japan
[6] Azusa Pacific Univ, Dept Biol & Chem, Azusa, CA USA
[7] Natl Agr & Food Res Org, Kyushu Okinawa Agr Res Ctr, Chikugo, Japan
[8] Chiba Univ, Fac Hort, Matsudo, Chiba, Japan
基金
日本学术振兴会;
关键词
chalky grains; climate change adaptation; CO2 fertilization effects; FACE; grain appearance quality; grain yield; nitrogen nutrition; Oryza sativa; NITROGEN-USE EFFICIENCY; ENRICHMENT FACE; ELEVATED CO2; CARBON-DIOXIDE; RESPONSES; QUALITY; CROPS; SOIL; NITRIFICATION; ACCUMULATION;
D O I
10.3389/fpls.2019.00361
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Enhancing crop yield response to elevated CO2 concentrations (E-[CO2]) is an important adaptation measure to climate change. A high-yielding indica rice cultivar "Takanari" has recently been identified as a potential candidate for high productivity in E-[CO2] resulting from its large sink and source capacities. To fully utilize these traits, nitrogen should play a major role, but it is unknown how N levels influence the yield response of Takanari to E-[CO2]. We therefore compared grain yield and quality of Takanari with those of Koshihikari, a standard japonica cultivar, in response to Free-Air CO2 enrichment (FACE, +200 mu mol mol(-1)) under three N levels (0, 8, and 12g m(-2)) over three seasons. The biomass of both cultivars increased under E-[CO2] at all N levels; however, the harvest index decreased under E-[CO2] in the N-limited treatment for Koshihikari but not for Takanari. The decreased harvest index of Koshihikari resulted from limited enhancement of spikelet number under N-limitation. In contrast, spikelet number increased in E-[CO2] in Takanari even without N application, resulting in significant yield enhancement, averaging 18% over 3 years, whereas Koshihikari exhibited virtually no increase in yield in E-[CO2] under the N-limited condition. Grain appearance quality of Koshihikari was severely reduced by E-[CO2], most notably in N-limited and hot conditions, by a substantial increase in chalky grain, but chalky grain % did not increase in E-[CO2] even without N fertilizer. These results indicated that Takanari could retain its high yield advantage over Koshihikari with limited increase in chalkiness even under limited N conditions and that it could be a useful genetic resource for improving N use efficiency under E-[CO2].
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页数:15
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