A newly evolved rice‐specific gene JAUP1 regulates jasmonate biosynthesis and signalling to promote root development and multi‐stress tolerance

Author:

Muzaffar Adnan123ORCID,Chen Yi‐Shih34,Lee Hsiang‐Ting1234,Wu Cheng‐Chieh5,Le Trang Thi3,Liang Jin‐Zhang36,Lu Chun‐Hsien37,Balasubramaniam Hariharan38,Lo Shuen‐Fang9,Yu Lin‐Chih3,Chan Chien‐Hao3,Chen Ku‐Ting3,Lee Miin‐Huey10,Hsing Yue‐Ie5,Ho Tuan‐Hua David45,Yu Su‐May12347ORCID

Affiliation:

1. Molecular and Cell Biology, Taiwan International Graduate Program Academia Sinica Taipei Taiwan, ROC

2. Graduate Institute of Life Sciences National Defense Medical Center Taipei Taiwan, ROC

3. Institute of Molecular Biology Academia Sinica Taipei Taiwan, ROC

4. Advanced Plant Biotechnology Center National Chung Hsing University Taichung Taiwan, ROC

5. Institute of Plant and Microbial Biology Academia Sinica Taipei Taiwan, ROC

6. Department of Agricultural Chemistry National Taiwan University Taipei Taiwan, ROC

7. Genome and Systems Biology Degree Program National Taiwan University and Academia Sinica Taipei Taiwan, ROC

8. Molecular and Biological Agricultural Sciences, Taiwan International Graduate Program Academia Sinica and National Chung Hsing University Taipei Taiwan, ROC

9. International Bachelor Program of Agribusiness National Chung Hsing University Taichung Taiwan, ROC

10. Department of Plant Pathology National Chung Hsing University Taichung Taiwan, ROC

Abstract

SummaryRoot architecture and function are critical for plants to secure water and nutrient supply from the soil, but environmental stresses alter root development. The phytohormone jasmonic acid (JA) regulates plant growth and responses to wounding and other stresses, but its role in root development for adaptation to environmental challenges had not been well investigated. We discovered a novel JA Upregulated Protein 1 gene (JAUP1) that has recently evolved in rice and is specific to modern rice accessions. JAUP1 regulates a self‐perpetuating feed‐forward loop to activate the expression of genes involved in JA biosynthesis and signalling that confers tolerance to abiotic stresses and regulates auxin‐dependent root development. Ectopic expression of JAUP1 alleviates abscisic acid‐ and salt‐mediated suppression of lateral root (LR) growth. JAUP1 is primarily expressed in the root cap and epidermal cells (EPCs) that protect the meristematic stem cells and emerging LRs. Wound‐activated JA/JAUP1 signalling promotes crosstalk between the root cap of LR and parental root EPCs, as well as induces cell wall remodelling in EPCs overlaying the emerging LR, thereby facilitating LR emergence even under ABA‐suppressive conditions. Elevated expression of JAUP1 in transgenic rice or natural rice accessions enhances abiotic stress tolerance and reduces grain yield loss under a limited water supply. We reveal a hitherto unappreciated role for wound‐induced JA in LR development under abiotic stress and suggest that JAUP1 can be used in biotechnology and as a molecular marker for breeding rice adapted to extreme environmental challenges and for the conservation of water resources.

Funder

Ministry of Science and Technology

Agricultural Biotechnology Research Center, Academia Sinica

Publisher

Wiley

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