{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T22:52:21Z","timestamp":1789599141792,"version":"build-2803163510"},"reference-count":66,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T00:00:00Z","timestamp":1663027200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Science and Technology Department of Sichuan Province, China","award":["2021YFYZ0020"],"award-info":[{"award-number":["2021YFYZ0020"]}]},{"name":"Science and Technology Department of Sichuan Province, China","award":["2022NSFSC0142"],"award-info":[{"award-number":["2022NSFSC0142"]}]},{"name":"Science and Technology Department of Sichuan Province, China","award":["2022NZZJ0019"],"award-info":[{"award-number":["2022NZZJ0019"]}]},{"name":"Science and Technology Department of Sichuan Province, China","award":["2022NSFSC0141"],"award-info":[{"award-number":["2022NSFSC0141"]}]},{"name":"Science and Technology Department of Sichuan Province, China","award":["2022YF09-00036-SN"],"award-info":[{"award-number":["2022YF09-00036-SN"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Salicylic acid (SA) is a stress hormone synthesized in phenylalanine ammonia-lyase (PAL) and the branching acid pathway. SA has two interconvertible forms in plants: SAG (SA O-\u03b2-glucoside) and SA (free form). The molecular mechanism of conversion of SA to SAG had been reported previously. However, which genes regulate SAG to SA remained unknown. Here, we report a cytoplasmic \u03b2-glucosidase (\u03b2-Glu) which participates in the SA pathway and is involved in the brown hull pigmentation in rice grain. In the current study, an EMS-generated mutant brown hull 1 (bh1) displayed decreased contents of SA in hulls, a lower photosynthesis rate, and high-temperature sensitivity compared to the wild type (WT). A plaque-like phenotype (brown pigmentation) was present on the hulls of bh1, which causes a significant decrease in the seed setting rate. Genetic analysis revealed a mutation in LOC_Os01g67220, which encodes a cytoplasmic Os1\u03b2Glu4. The knock-out lines displayed the phenotype of brown pigmentation on hulls and decreased seed setting rate comparable with bh1. Overexpression and complementation lines of Os1\u03b2Glu4 restored the phenotype of hulls and normal seed setting rate comparable with WT. Subcellular localization revealed that the protein of Os1\u03b2Glu4 was localized in the cytoplasm. In contrast to WT, bh1 could not hydrolyze SAG into SA in vivo. Together, our results revealed the novel role of Os1\u03b2Glu4 in the accumulation of flavonoids in hulls by regulating the level of free SA in the cellular pool.<\/jats:p>","DOI":"10.3390\/ijms231810646","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T21:06:52Z","timestamp":1663103212000},"page":"10646","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Rice \u03b2-Glucosidase 4 (Os1\u03b2Glu4) Regulates the Hull Pigmentation via Accumulation of Salicylic Acid"],"prefix":"10.3390","volume":"23","author":[{"given":"Peizhou","family":"Xu","sequence":"first","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tingkai","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"},{"name":"Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7688-148X","authenticated-orcid":false,"given":"Asif","family":"Ali","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinhao","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yutong","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunfeng","family":"Tian","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Su","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongyu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongxiang","family":"Liao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoqiong","family":"Chen","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Farwa","family":"Shoaib","sequence":"additional","affiliation":[{"name":"Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changhui","family":"Sun","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5549-2637","authenticated-orcid":false,"given":"Zhengjun","family":"Xu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Duo","family":"Xia","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0157-0235","authenticated-orcid":false,"given":"Xianjun","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Southwest Crop Genetic Resources and Genetic Improvement, Ministry of Education, Rice Research Institute, Sichuan Agricultural 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