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Fruit storage is a common practice to improve seed quality in cucurbits; but studies are lacking on the contribution of their fruit pulp reserves towards developing seeds contained in them. So, studies were undertaken in cucumber to quantify the mobilization of fruit pulp reserves towards seeds in cucumber (Cucumis sativus L.) by harvesting fruits at three development stages viz., 30, 40 and 50 days after anthesis (DAA) followed by in situ storage of harvested fruits for four durations viz., 0, 5, 10 and 15 days. Fruit harvest stage and in-situ storage duration did not have significant effect on total seed number per fruit. However, seed weight per fruit and storage reserves in seeds viz., starch, total soluble proteins and total amino acids increased significantly with delay in stage of fruit harvest and increased in-situ storage duration of fruits. However, total soluble sugars in seeds decreased with delay in stage of fruit harvest and increased in-situ storage duration of fruits. Total soluble sugars and free amino acids in fruit pulp increased while total soluble proteins and starch content decreased with delay in stage of fruit harvest and increased in-situ storage duration of fruits. Total soluble sugars, total soluble proteins and total free amino acids of fruit pulp showed significant positive correlation with seed weight per fruit. However, starch content of pulp recorded significant negative correlation with seed weight per fruit indicating that greater is the hydrolysis of starch contained in the fruit pulp, higher the mobilization of reserves towards seeds developing inside the detached fruits kept for in situ storage. Results of present study clearly demonstrate that fruit pulp has a pivotal role in transferring the stored food reserves to the developing seeds even after detachment of fruits from the mother plant.
Plant Physiology Reports – Springer Journals
Published: Jun 1, 2022
Keywords: Cucumber; Fruit pulp; Mobilization; Proteins; Starch; Sugars
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