![]() ![]() For the carbohydrate biosynthetic system, the activity of sucrose phosphate synthase (SPS) was the highest at the late planting date after 14 DAA, whereas it was at the lowest at the very late planting date. For the carbohydrate catabolic system, acid and neutral invertase (AI and NI, respectively) showed higher activity before 14 DAA, whereas both sucrose synthase (SS) and starch phosphorylase (SP) showed higher activity after 14 DAA. For leaf chlorophyll content, rapeseed planted at an optimal date maximized at 14 DAA with an average content of 1.51 mg g − 1 fresh weight, whereas it kept high and stable at a very late planting date after 28 DAA. ![]() Leaf dry matter was the lowest at the very late planting date during the reproductive stage. The results showed that leaf dry matter decreased linearly on average from 7.48 to 0.62 g plant −1 with an early planting date, whereas it increased at first and peaked at 14 days after anthesis (DAA) with other planting dates. A two-year field experiment was conducted to assess the effect of planting dates, including early (15 September), optimal (1 October), late (15 October), and very late (30 October), on leaf growth and carbohydrate biosynthetic and catabolic metabolism at the reproductive stage. However, regulation of the leaf carbohydrate metabolism in rapeseed by a late planting date at the reproductive stage is scarcely investigated. Delayed planting date of rapeseed is an important factor affecting seed yield. ![]()
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March 2023
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