Effects of New Type of Light Conversion Film Covering on the Growth Quality and Stomatal Characteristics of Greenhouse Cut Rose

FAN Xiaolei; MENG Lingchao; LI Dandan; ZHOU Qiang

doi:10.15933/j.cnki.1004-3268.2025.07.013

Abstract：Using Rosa hybrida'Red Meilland'of landscape plants as the test material,this study investigated the effects of green to red light conversion agents(LCA1),purple to red light conversion agents(LCA2),and green purple to red blue compound light conversion agents(LCA3)on the agronomic traits,chlorophyll content,chlorophyll fluorescence parameters,photosynthetic parameters,and stomatal characteristics of cut roses.The results showed that the addition of light conversion agent film under cover helped to improve the height,stem diameter,and petal diameter of roses,but had no significant effect on the number of rose branches.Only LCA3 treatment had a significant impact on the flowering period of roses.Compared with the common PO film control(CK)treatment without light conversion agent,the LCA3 treatment increased the content of chlorophyll a,chlorophyll b,and chlorophyll a+b in roses by 29.5％,54.5％,and 33.6％,respectively,while the content of chlorophyll a/b decreased by 14.9％,with no significant effect on carotenoid content;the maximum photochemical quantum efficiency(Fv/Fm),potential activity(Fv/Fo),actual photochemical quantum efficiency(ΦPSⅡ),effective photochemical quantum efficiency(Fv'/Fm'),photochemical quenching coefficient(qP),and relative electron transfer rate(ETR)of rose leaves increased by 6.9％,55.3％,1.6％,53.6％,11.8％,and 35.2％,respectively.The thickness,stomatal density,length,and width of rose leaves increased by 15.1％,35.8％,15.8％,and 38.3％,respectively.Covering with different light transfer films helped to increase the net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),water use efficiency(WUE),and stomatal limitation value(Ls)of roses,while reduced intercellular carbon dioxide concentration(Ci).At the same time,LCA3 treatment had a higher effect on reducing the release of ethylene from roses and increasing the activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)compared to LCA2,LCA1,and CK treatments.In summary,LCA3 treatment has the best effect on improving rose photosynthesis,increasing chlorophyll content and chlorophyll fluorescence parameters,and improving the agronomic traits of roses.