Citation:Wang,X.-Q.;Zeng,Z.-L.;Shi,Z.-M.;Wang,J.-H.;Huang,W.VariationinPhotosyntheticEfficiencyunderFluctuatingLightbetweenRoseCultivarsanditsPotentialforImprovingDynamicPhotosynthesis.Plants2023,12,1186.https://doi.org/10.3390/plants12051186AcademicEditors:LorenzoFerroniandMarekZivcakReceived:31January2023Revised:9February2023Accepted:21February2023Published:6March2023Copyright:©2023bytheauthors.LicenseeMDPI,Basel,Switzerland.ThisarticleisanopenaccessarticledistributedunderthetermsandconditionsoftheCreativeCommonsAttribution(CCBY)license(https://creativecommons.org/licenses/by/4.0/).plantsArticleVariationinPhotosyntheticEfficiencyunderFluctuatingLightbetweenRoseCultivarsanditsPotentialforImprovingDynamicPhotosynthesisXiao-QianWang1,2,†,Zhi-LanZeng2,3,†,Zi-MingShi4,Ji-HuaWang4andWeiHuang2,*1SchoolofLifeSciences,NorthwestUniversity,Xi’an710069,China2KunmingInstituteofBotany,ChineseAcademyofSciences,Kunming650201,China3UniversityofChineseAcademyofSciences,Beijing100049,China4FlowerResearchInstituteofYunnanAcademyofAgriculturalSciences,Kunming650205,China*Correspondence:huangwei@mail.kib.ac.cn†Theseauthorscontributedequallytothiswork.Abstract:Photosyntheticefficiencyunderbothsteady-stateandfluctuatinglightcansignificantlyaffectplantgrowthundernaturallyfluctuatinglightconditions.However,thedifferenceinphoto-syntheticperformancebetweendifferentrosegenotypesislittleknown.Thisstudycomparedthephotosyntheticperformanceundersteady-stateandfluctuatinglightintwomodernrosecultivars(Rosehybrida),“OrangeReeva”and“Gelato”,andanoldChineseroseplantRosachinensiscultivar,“Slater’scrimsonChina”.ThelightandCO2responsecurvesindicatedthattheyshowedsimilarphotosyntheticcapacityundersteadystate.Thelight-saturatedsteady-statephotosynthesisinthesethreerosegenotypeswasmainlylimitedbybiochemistry(60%)ratherthandiffusionalconductance.Underfluctuatinglightconditions(alternatedbetween100and1500µmolphotonsm−2m−1every5min),stomatalconductancegraduallydecreasedinthesethreerosegenotyp...
