单一及组合引发剂对甜瓜种子萌发及幼苗生长的影响OA北大核心CSTPCD

This study took the aging seeds of'Hualanshi'which is the main cultivar of muskmelon in Ningxia as an experimental material.In order to investigate the effects of priming agents on the seed germination and seedling growth of muskmelon,and to select the optimal priming agent,three kinds of priming agents were selected to treat muskmelon seeds with single or combined treatments.The results of standard germination test showed that both single and combined priming agent could significantly promote the germination of aged muskmelon seeds,and the activity index of muskmelon seeds treated with combined priming agent(5 g·L-1 CaCl2+ 2 g·L-1 MnSO4·H2O)was significantly higher than that of control and other treatments.The results of plug seedling suggested that:the combined priming agent significantly promoted the growth of muskmelon seedlings,and significantly increased stem diameter,total fresh weight,total dry weight and seedling strength index of muskmelon seedlings.The seedling strength index of 5 g·L-1 CaCl2+ 2 g·L-1 MnSO4·H2O(T4)and 5 g·L-1 CaCl2+ 1.25 g·L-1 water-soluble chitosan(T5)were 2.00 times and 1.89 times that of control(CK1),respectively.At the same time,T5 treatment had the greatest increase in photosynthetic pigment content of leaves,and the root activity in muskmelon seedlings.The principal component analysis also suggested that the optimal treatment was the T5.The combination initiator screened in this experiment can effectively improve the seed vitality of melon,promote seedling growth and enhance seedling quality,which can provide technical support for centralized seedling technology of muskmelon.