The experiment utilized the tomato cultivar'Heinz 1706'to investigate the impact of beet molasses treatment on the growth and sugar transport of tomato seedlings,aiming to provide a theoretical basis for the widespread application of beet molasses.Two treatments in the experiment:the control group received water sprayed on tomato plants,and the treatment group received an equivalent amount of beet molasses(diluted 300 times)sprayed on tomato plants.Compared with the control group,sugar beet molasses treatment increased the plant height,stem diameter,crown width,leaf area,root surface area,root volume,root length,average root diameter,aboveground dry weight,aboveground fresh weight,underground dry weight,underground fresh weight,Chlorophyll content and net photosynthetic rate of tomato seedlings by 27.2%,10.6%,20.6%,61.8%,20.3%,25.3%,24.2%,11.0%,25.1%,26.3%,21.4%,33.2%,17.2%and 32.7%,respectively.Further,this study assessed the expression patterns of sugar content and sucrose transporter(SUTs)genes in source and sink(stem tip,stem,leaves,and roots).The results indicated that beet molasses treatment significantly increased sugar content in tomato seedlings,particularly accumulating substantial sucrose and reducing sugars in leaves and stem tip.Compared with the control group,sugar content in tomato increased significantly,especially in the leaves and shoot tips accumulated a lot of sucrose and reducing sugar,respectively.The expression of SLSUTS gene was significantly up-regulated in stem tip,stem,leaf and root of tomato seedlings.In summary,beet molasses may induce the expression of tomato SlSUTs genes,promoting the accumulation and efficient distribution of sugars in source and sink of tomato seedlings.This enhancement increased chlorophyll content and photosynthetic capacity,ultimately stimulating tomato growth.
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