Abstract
Sugar beet is an important economic crop because of its high sucrose concentration in the roots. However, information on the relationship between sucrose metabolism-related enzymes and root yield is scarce. In this study, we aimed to investigate the activity of sucrose phosphate synthase (SPS), sucrose synthase (SS), and invertase (INV), which are key enzymes in sucrose metabolism, in relation to root weight and sucrose content in different parts of the sugar beet plant over the growth cycle. Results showed that root SPS, SS, and INV activities positively correlated with sucrose content. SPS activity increased with maturity, reaching the highest rates at harvest, whereas INV activity was high at the early stages and gradually decreased with maturity. No association was found between SPS, SS, or INV activity in the leaves and petioles with sucrose content, or between root weight and sucrose content. Overall, our results provide new insights into the underlying mechanism of sucrose metabolism and will allow faster development of sugar beet cultivars with high sucrose content.
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