Effects of Spraying Chlormequat Chloride on Tomato Plant and Fruit Quality

Ma Yanan; Cao Yilin; Su Lulu; Wang Hui; Xin Shijie; Jiang Bo; Wang Fu; Zhu Wenying

doi:10.14083/j.issn.1001-4942.2023.12.010

Abstract：In this study,the tomato variety'Qingnong 866'was used as material to study the effects of spraying different concentrations of chlormequat chloride(CCC)on tomato plant growth,yield and fruit quali-ty.The results showed that the elongation growth of tomato plants was inhibited to different degrees after spra-ying CCC.The net photosynthetic rate and chlorophyll content of leaves increased first and then decreased with the increase of CCC concentration,and both reached the highest when the concentration was 300 mg/L.The single fruit weight,yield per plant and yield per hectare decreased with the increase of CCC concentration,but did not reach significant level,while the fruit number per plant increased significantly.The soluble solids and VC contents of fruits were the highest when the CCC concentration was 300 mg/L,and the total acid content was the highest when the CCC concentration was 200 mg/L.GC-MS analysis showed that 2,4-decadienal,6-methyl-5-heptene-2-one,2-isobutylthiazole and other substances positively related to flavor quality in fruits un-der CCC treatment showed increasing trends.In summary,spraying chlormequat chloride could inhibit inter-node elongation and decrease plant height to a certain extent,enhance photosynthesis,increase fruit number per plant and soluble solid content,decrease sugar-acid ratio of fruits,improve fruit taste quality,but de-crease single fruit weight,total yield slightly,and affect the components and contents of volatile substances in fruits.The results of this study could provide references for reasonable utilization of CCC in tomato production.