Article(id=1305139350837158329, tenantId=1146029695717560320, journalId=1303687221787852879, issueId=1305139324555649224, articleNumber=null, orderNo=null, doi=10.7606/j.issn.1009-1041.2026.03.08, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1747065600000, receivedDateStr=2025-05-13, revisedDate=1750608000000, revisedDateStr=2025-06-23, acceptedDate=null, acceptedDateStr=null, onlineDate=1789099069555, onlineDateStr=2026-09-11, pubDate=1773504000000, pubDateStr=2026-03-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789099069555, onlineIssueDateStr=2026-09-11, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789099069555, creator=13701087609, updateTime=1789099069555, updator=13701087609, issue=Issue{id=1305139324555649224, tenantId=1146029695717560320, journalId=1303687221787852879, year='2026', volume='46', issue='3', pageStart='F2', pageEnd='424', issueExtLink='null', onlineDate='null', pubDate='1773504000000', pubDateStr='2026-03-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789099063289, creator='13701087609', updateTime=1789103147683, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1305156455804465602, tenantId=1146029695717560320, journalId=1303687221787852879, issueId=1305139324555649224, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1305156455804465603, tenantId=1146029695717560320, journalId=1303687221787852879, issueId=1305139324555649224, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=356, endPage=367, ext={EN=ArticleExt(id=1305139351034290618, articleId=1305139350837158329, tenantId=1146029695717560320, journalId=1303687221787852879, language=EN, title=Physiological Mechanism of Exogenous Brassinolide Reducing Floret Degeneration and Promoting Grain Formation in Wheat, columnId=1305133133406433355, journalTitle=Journal of Triticeae Crops, columnName=Physiology, Ecology and Cultivation, runingTitle=null, highlight=null, articleAbstract=

To clarify the physiological mechanisms by which exogenous brassinolide (Brassinolide, BR) regulates floret degeneration and grain formation in wheat, a spring wheat cultivar Yangmai 15 was used as the material. During the booting stage, plants were sprayed with 0, 0.1, 0.2, or 0.4 mg·L^-1 BR. The results showed that compared with un-spraying BR, spraying BR significantly reduced the floret degeneration rate and increased the number of grains per spike and grain weight. The 0.2 mg·L^-1 BR treatment was the most effective, increasing grains per spike by 4.76 and grain weight per spike by 7.58%. Spraying BR signifficant improved the chlorophyll content, maximum photochemical efficiency, and net photosynthetic rate from 5 to 25 days after spraying. Spraying BR promoted the accumulation of photosynthetic assimilates and their translocation to the spike. 10 days after spraying, sucrose content in the spike increased by 10.47% under 0.2 mg·L^-1 BR; sucrose synthase activity also increased, accompanied by upregulated expression of key sucrose-metabolism genes, including TaSUT1, TaSUS1, TaCWI, and TaAGPL1. Spraying BR modulated endogenous hormone balance in the spike: the 0.2 mg·L^-1 BR treatment increased gibberellin content by 13.42%, decreased abscisic acid content by 34.86%, and significantly raised the IAA/ABA and GA₃/ABA ratios by 37.10% and 42.71%, respectively. Spraying BR improved endosperm development. After anthesis, the relative areas of amyloplasts and protein bodies in endosperm cells under 0.2 mg·L^-1 BR increased significantly with 27.12% and 18.98% respectively. In conclusion, exogenous BR effectively reduced floret degeneration and promoted grain formation by enhancing photosynthetic capacity, optimizing assimilate partitioning, and regulating sucrose metabolism and hormonal homeostasis. This led to higher grains per spike and grain weight per spike, and ultimately increased yield. Under the experimental conditions, the optimal BR concentration was 0.2 mg·L^-1.

, authors=Xurun YU¹, Jinwen DONG¹, Qingming REN¹, Liping RAN², Jiagu WEI¹, Haibo WANG¹, Jiayi HUO¹, Ruyi QIE¹, Fei XIONG¹, authorsList=Xurun YU, Jinwen DONG, Qingming REN, Liping RAN, Jiagu WEI, Haibo WANG, Jiayi HUO, Ruyi QIE, Fei XIONG, authorCompany=null, correspAuthors=Fei XIONG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1305139351285948859, articleId=1305139350837158329, tenantId=1146029695717560320, journalId=1303687221787852879, language=CN, title=外源油菜素内酯调控小麦小花退化、促进籽粒形成的生理机制研究, columnId=1305133133590982733, journalTitle=麦类作物学报, columnName=生理、生态与栽培, runingTitle=null, highlight=null, articleAbstract=

为探明外源油菜素内酯调控小麦小花退化与籽粒形成的生理机制，以春小麦扬麦15为试验材料，在小麦孕穗期分别喷施0、0.1、0.2、0.4 mg·L^-1的油菜素内酯（Brassinolide, BR）。结果表明，与未喷施BR相比，喷施BR显著降低小花退化率，提高了穗粒数和穗粒重，其中0.2 mg·L^-1BR处理效果最佳，穗粒数增加了4.76粒，穗粒重提升了7.58%；喷施BR显著提高喷施后第5天-第25天的叶绿素的含量、最大光化学效率和净光合速率；喷施BR促进光合同化物的积累及其向穗部转运，喷施后第10天，0.2 mg·L^-1BR处理的穗部蔗糖含量增加10.47%，蔗糖合成酶活性上升，并上调TaSUT1、TaSUS1、TaCWI、TaAGPL1等蔗糖代谢关键基因表达；调控穗部内源激素平衡，0.2 mg·L^-1BR处理的赤霉素含量提升13.42%，脱落酸含量下降34.86%，IAA/ABA和GA₃/ABA分别显著提高37.10%和42.71%；喷施BR改善籽粒胚乳发育，花后胚乳细胞中淀粉体和蛋白体相对面积显著增加，其中0.2 mg·L^-1BR处理下分别显著提高27.12%和18.98%。综合来看，喷施外源BR通过增强小麦植株的光合能力、优化同化物分配、调节蔗糖代谢及内源激素平衡，有效减少小花退化并促进籽粒形成，从而提高穗粒数和穗粒重，最终实现增产。在本试验条件下，0.2 mg·L^-1为最佳喷施浓度。

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