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以芍药(Paeonia lactiflora Pall.)品种‘桃花飞雪’为试材,测定了不同发育时期花枝以及花瓣的呼吸速率、乙烯释放速率、ACC含量、ACS和ACO活性的变化。结果表明:芍药切花花瓣的乙烯释放速率有明显的跃变峰,整枝花乙烯释放表现为末期上升型。花瓣与花枝呼吸速率均有明显的跃变,花瓣的跃变峰早于整枝花。花瓣的乙烯释放速率及呼吸速率均明显高于花枝,揭示花瓣是花枝产生乙烯的主要器官,花瓣的乙烯释放决定了花枝的开放与衰老进程。花瓣ACS活性与乙烯释放量的变化趋势较为一致,说明ACS是影响乙烯生物合成的限制因子。
Taking Paeonia lactiflora Pall. Variety ’Peach Blossom’ as test material, the changes of respiration rate, ethylene release rate, ACC content, ACS and ACO activity of flowering branches and petals at different developmental stages were measured. The results showed that the ethylene release rate of cut flower petals of peony had a significant transition peak, and the release of ethylene from the pruning flower branches appeared as the late rising type. Petals and flowering branches have significant changes in respiratory rate, petal jump peak earlier than the pruning flower. The ethylene release rate and respiration rate of petals were significantly higher than those of flowering branches, revealing that petals were the main organs of flowering branches to produce ethylene. The ethylene release of petals determined the opening and senescence of flowering branches. The changes of petal ACS activity and ethylene release were in good agreement, indicating that ACS is the limiting factor of ethylene biosynthesis.