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A Preliminary Study on the Seed Dormant Mechanism in Buffalograss

Li Deying(Department of Ornamental Horticulture, Beijing Agricultural University, Beijing 100094)  
Anatomy structure and imbibition of buffalograss [Buchloe dactyloides (Nutt) Engelm] seeds with the hard bracts removed or unremoved were studied. Thereafter the caryopsis were treated with 0.2% KNO3 at 0~4℃ for a week, or with 150mg/L GA3 or 800mg/L ethephon respectively. Both treated and untreated caryopsis were then germinated at constant temperature of 30℃ or at alternate temperature of 30~10℃ in a germinating chamber. The seed germinating rate was calculated every day for 28 days. The amylase activity of germinating seeds and seedlings were tested one and two weeks respectively after they were set on the paper beds. Present study indicates that dormancy of buffalograss seeds were controlled by syndrome factors. The hard bract restricts water imbibition to 26% of dry weight of caryopsis against the germinating requisition of 40%.The synaptosperms seem not interact but differ in dormant degree. The seed dormancy could be broken by removing the hard bract and pretreating the caryopsis in 0.2% KNO3 solution at 0~4℃, so that the germinating rate reached 85% in two weeks.Exogenous GA3 and ethephon could partialy replace the pretreatment by activating the amylases. It is proPOsed th.at the α-amylase activity was directly resPOnsible to the seed germination while the β-amylase was effective only when sufficient α-amylase activity co-existed.
【CateGory Index】: S688.403.2
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