1. Publication
  2. Research Highlights
  3. 2023

A quantitative locus, MP3, which increases panicle number, enhances grain yield under an elevated atmospheric CO2 environment

Related Research Project
Africa rice farming system SATREPS Madagascar

Description

The atmospheric concentration of CO2, one of the greenhouse gases, is projected to reach 430ー1,000 ppm by the end of this century, increasing the average global temperature by 1.0ー5.7°C above pre-industrial levels (1850~1900). While the increase in temperature will have a negative effect on crop productivity in some regions, the increase in atmospheric CO2 concentration will have a positive effect on plant photosynthesis. Therefore, crops with sufficient spikelets to store increased photosynthetic assimilates are expected to contribute to increased yield, and the utilization of such crops under high CO2 concentrations may lead to sustainable crop production under climate change. We have previously shown that a quantitative locus, MP3 (MORE PANICLES 3), found in the temperate japonica rice cultivar Koshihikari, promotes tillering and increases panicle number in the high-yielding indica cultivar Takanari. The purpose of this study is to identify the causal gene of MP3 by map-based cloning, clarify the rice groups in which MP3 is effective, and verify that increased panicle number due to MP3 contributes to increased grain yield under an elevated atmospheric CO2 environment.

We can see the results of map-based cloning in Fig. 1. The causal gene of MP3 is OsTB1 (TEOSINTE BRANCHED1) located on chromosome 3, and there are three sequence differences in the gene between Koshihikari and Takanari. Classifying rice cultivar groups based on the sequence differences, 74% of temperate japonica cultivars and 10% of tropical japonica cultivars have the same sequence as Koshihikari (Koshihikari type). On the other hand, 60% of the indica cultivars have the same sequence as Takanari (Takanari type) (Fig. 2). Then, near-isogenic lines (NILs) carrying the Koshihikari MP3 in the high-yielding indica cultivars, IR64 and Hokuriku 193, also increase panicle number by 20ー30% compared to the parental cultivars as in the case of Takanari (Fig. 3). Interestingly, Takanari-NIL enhances grain yield by 6% compared to Takanari under open-air CO2 enrichment (FACE, 580 ppm CO2 in the air), whereas it does not under ambient condition (390 ppm CO2 in the air) (Fig. 4).

Since indica cultivars are grown on more than 80% of the world's rice cropping areas, the Koshihikari MP3 is expected to be widely used in rice breeding in Japan and abroad to address climate change accompanied by rising atmospheric CO2 levels. However, it should be noted that the effect of MP3 on panicle number and grain yield under high-temperature conditions needs to be verified in the future.
 

Figure, table

  1. Figs
Research project
Program name

Food

KAKEN
Term of research

FY2017-2022

Responsible researcher

Takai Toshiyuki ( Crop, Livestock and Environment Division )

ORCID ID
0000-0002-6498-610X
KAKEN Researcher No.: 40547725
MIERUKA ID: 1769

Tsujimoto Yasuhiro ( Crop, Livestock and Environment Division )

ORCID ID
0000-0001-7738-9913
KAKEN Researcher No.: 20588511

Asai Hidetoshi ( Crop, Livestock and Environment Division )

KAKEN Researcher No.: 30599064

Kawamura Kensuke ( Social Sciences Division )

ORCID ID
0000-0002-2824-1266
KAKEN Researcher No.: 90523746
MIERUKA ID: 1747

Maruyama Kyounoshin ( Biological Resources and Post-harvest Division )

KAKEN Researcher No.: 10425530
MIERUKA ID: 001781

Ishizaki Takuma ( Tropical Agriculture Research Front )

KAKEN Researcher No.: 30442718
MIERUKA ID: 001791

KOBAYASHI Nobuya ( Biological Resources Division )

Taniguchi Yojiro ( National Agriculture and Food Research Organization (NARO) )

KAKEN Researcher No.: 50462560

Takahashi Megumu ( National Agriculture and Food Research Organization (NARO) )

KAKEN Researcher No.: 90739153

Hirose Sakiko ( National Agriculture and Food Research Organization (NARO) )

MIERUKA ID: 1323

Hara Naho ( National Agriculture and Food Research Organization (NARO) )

Sanoh-Arai Yumiko ( National Agriculture and Food Research Organization (NARO) )

KAKEN Researcher No.: 50547726

Hori Kiyosumi ( National Agriculture and Food Research Organization (NARO) )

ORCID ID
0000-0003-3783-9718
KAKEN Researcher No.: 50442827

Fukuoka Shuichi ( National Agriculture and Food Research Organization (NARO) )

SAKAI Hidemitsu ( National Institute for Agro-Environmental Sciences )

Tokida Takeshi ( National Agriculture and Food Research Organization (NARO) )

ORCID ID
0000-0001-7245-2952
KAKEN Researcher No.: 20585856
MIERUKA ID: 1636

Usui Yasuhiro ( National Agriculture and Food Research Organization (NARO) )

ORCID ID
0000-0003-3239-0907
KAKEN Researcher No.: 20631485
MIERUKA ID: 174

KONDO Motohiko ( Biological Resources Division )

Hasegawa Toshihiro ( National Agriculture and Food Research Organization (NARO) )

ORCID ID
0000-0001-8501-5612
KAKEN Researcher No.: 10228455

Uga Yusaku ( Institute of Crop Science, NARO )

Akashi Hiroko ( Yokohama City University )

Ito Jun ( Yokohama City University )

KAKEN Researcher No.: 20373269

Tsuji Hiroyuki ( Yokohama City University )

ORCID ID
0000-0002-6444-559X
KAKEN Researcher No.: 40437512

Mochida Keiichi ( RIKEN )

ORCID ID
0000-0003-1299-0024
KAKEN Researcher No.: 90387960

Yamamoto Eiji ( Meiji University )

ORCID ID
0000-0002-3095-6455
KAKEN Researcher No.: 40738746

Nagasaki Hideki ( Kazusa DNA Research Institute )

ORCID ID
0000-0002-0020-8827
KAKEN Researcher No.: 70624451

Nakamura Hirofumi ( Taiyo Keiki )

ほか
Publication, etc.

Takai et al. (2023) The Plant Journal 114: 729−742.
https://doi.org/10.1111/tpj.16143

Japanese PDF

2023_B07_ja.pdf446.61 KB

English PDF

2023_B07_en.pdf145.27 KB

＊ Affiliation at the time of implementation of the study.

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