Phosphate starvation response precedes abscisic acid response under progressive mild drought in plants.

Natsuko I Kobayashi, Yasunari Fujita, Tetsuji Oya, Yasuo Yasui, Masao Ishimoto, Eri Ogiso-Tanaka, Junya Baba, Kenichiro Fujii, Keitaro Tanoi, Yukari Nagatoshi, Hitoshi Sakakibara, Mikiko Kojima, Yumiko Takebayashi, Ryohei Sugita, Nobuyuki Mizuno, Yasufumi Kobayashi, Kenta Ikazaki

Journal: Nature communications 2023;14(1):5047

PMID: 37598175

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Abstract

Drought severely damages crop production, even under conditions so mild that the leaves show no signs of wilting. However, it is unclear how field-grown plants respond to mild drought. Here, we show through six years of field trials that ridges are a useful experimental tool to mimic mild drought stress in the field. Mild drought reduces inorganic phosphate levels in the leaves to activate the phosphate starvation response (PSR) in soybean plants in the field. Using Arabidopsis thaliana and its mutant plants grown in pots under controlled environments, we demonstrate that PSR occurs before abscisic acid response under progressive mild drought and that PSR plays a crucial role in plant growth under mild drought. Our observations in the field and laboratory using model crop and experimental plants provide insight into the molecular response to mild drought in field-grown plants and the relationship between nutrition and drought stress response.

Address: Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, 305-8686, Japan.; Crop, Livestock and Environment Division, JIRCAS, Tsukuba, Ibaraki, 305-8686, Japan.; Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto, 606-8502, Japan.; Institute of Crop Science, NARO, Tsukuba, Ibaraki, 305-8518, Japan.; Radioisotope Research Center, Nagoya University, Nagoya, Aichi, 464-8602, Japan.; RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan.; Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, 464-8601, Japan.; Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo, 113-8657, Japan.; Institute of Agrobiological Sciences, NARO, Tsukuba, Ibaraki, 305-8604, Japan.; Institute of Crop Science, National Agricultuetre and Food Research Organization (NARO), Tsukuba, Ibaraki, 305-8518, Japan.; Center for Molecular Biodiversity Research, National Museum of Nature and Science, Tsukuba, Ibaraki, 305-0005, Japan.; Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, 305-8686, Japan. [email protected].; Graduate School of Life Environmental Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan. [email protected].

DOI: 10.1038/s41467-023-40773-1

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MeSH Terms: Humans, Phosphates, Abscisic Acid, Droughts, Arabidopsis, Laboratories, Starvation