{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T15:56:11Z","timestamp":1790610971159,"version":"4.1.0"},"reference-count":60,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2022,12,20]],"date-time":"2022-12-20T00:00:00Z","timestamp":1671494400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["31000892, 31372008"],"award-info":[{"award-number":["31000892, 31372008"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Training program of outstanding young teacher","award":["yq2013095"],"award-info":[{"award-number":["yq2013095"]}]},{"name":"Agriculture Fund","award":["2018B020202009, 2014A020208085, 2014A020209081, 2015A020210099, 2016LM3174 and 2015A020209110"],"award-info":[{"award-number":["2018B020202009, 2014A020208085, 2014A020209081, 2015A020210099, 2016LM3174 and 2015A020209110"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>\n                    Fruit peel creasing is a serious pre-harvest physiological disorder in citrus, influencing fruit quality, storage, and yield. Four- and eight-year-old \u2018Hongjiang\u2019 oranges grafted onto Canton lemon rootstocks were treated with calcium and calcium inhibitors, respectively, to study the effects of different treatments on fruit creasing rate, mechanical properties of the peel, cell wall metabolism enzyme activities, and the expression of related genes. Foliar application of 0.5% calcium nitrate significantly reduced the fruit creasing rate, while treatment with EGTA and LaCl\n                    <jats:sub>3<\/jats:sub>\n                    , inhibitors of calcium uptake, increased the fruit creasing rate; But the effect of calcium nitrate treatment on changing the mechanical properties of pericarp and inhibiting the activity of hydrolase (PG, Cx and PE) was not very significant. Furthermore, it was observed that the expression levels of genes (\n                    <jats:italic>PG<\/jats:italic>\n                    ,\n                    <jats:italic>Cx<\/jats:italic>\n                    , and\n                    <jats:italic>PE<\/jats:italic>\n                    ) encoding cell wall-degrading enzymes were significantly lower in the normal fruit peel than in the creased fruit peel. Meanwhile, the expression levels of\n                    <jats:italic>PG<\/jats:italic>\n                    ,\n                    <jats:italic>Cx<\/jats:italic>\n                    , and\n                    <jats:italic>PE<\/jats:italic>\n                    were higher in the peel of shaded fruit than in the peel of exposed fruit. During the high incidence period of fruit creasing, calcium nitrate treatment down-regulated the expression of\n                    <jats:italic>PG<\/jats:italic>\n                    ,\n                    <jats:italic>Cx<\/jats:italic>\n                    , and\n                    <jats:italic>PE<\/jats:italic>\n                    , while EGTA treatment up-regulated the expression of these genes. In conclusion, foliar spraying of calcium nitrate at the fruit rapid enlargement stage can increase the Ca content in the peel of \u2018Hongjiang\u2019 orange and significantly suppress the expression of cell wall degrading enzymes genes (\n                    <jats:italic>PG<\/jats:italic>\n                    ,\n                    <jats:italic>PE<\/jats:italic>\n                    and\n                    <jats:italic>Cx<\/jats:italic>\n                    ) in \u2018Hongjiang\u2019 orange peel during the high occurrence period of fruit creasing, resulting in reducing the occurrence of fruit creasing and cracking.\n                  <\/jats:p>","DOI":"10.7717\/peerj.14574","type":"journal-article","created":{"date-parts":[[2022,12,20]],"date-time":"2022-12-20T03:20:15Z","timestamp":1671506415000},"page":"e14574","source":"Crossref","is-referenced-by-count":24,"title":["Effects of calcium on cell wall metabolism enzymes and expression of related genes associated with peel creasing in\n                    <i>Citrus<\/i>\n                    fruits"],"prefix":"10.7717","volume":"10","author":[{"given":"Bin","family":"Huai","sequence":"first","affiliation":[{"name":"South China Agricultural University, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunli","family":"Wu","sequence":"additional","affiliation":[{"name":"South China Agricultural University, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunhui","family":"Liang","sequence":"additional","affiliation":[{"name":"Guangdong Agriculture Industry Business Polytechnic College, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Panfeng","family":"Tu","sequence":"additional","affiliation":[{"name":"Zhongkai University of Agriculture and Engineering, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tingting","family":"Mei","sequence":"additional","affiliation":[{"name":"South China Agricultural University, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anquan","family":"Guan","sequence":"additional","affiliation":[{"name":"Lianjiang Fruit Development Center, Lianjiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Yao","sequence":"additional","affiliation":[{"name":"South China Agricultural University, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan","family":"Li","sequence":"additional","affiliation":[{"name":"Zhongkai University of Agriculture and Engineering, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiezhong","family":"Chen","sequence":"additional","affiliation":[{"name":"South China Agricultural University, Guangzhou, 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