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Evidence for the accumulation of a germination inhibitor during progressive thermoinhibition of seeds of celery (Apium graveolens L.)
Authors:Tudor H Thomas  Anthony S Dearman  Norman L Biddington
Institution:(1) National Vegetable Research Station, Wellesbourne, CV35 9EF, Warwick, UK;(2) National Vegetable Research Station, Wellesbourne, Warwick, CV35 9EF, UK
Abstract:The germination of seeds of celery (Apium graveolens L.) becomes progressively thermoinhibited on incubation in the dark at high temperatures, the inhibitory temperature being dependent on the cultivar used. In two high-dormancy cultivars of celery, the production of germination inhibitors in seeds incubated in the dark at 26°C gradually increased over a 7-day period. Inhibitor production was measured by incubating seeds of the low-dormancy cultivar Florida 683 in homogenates of the thermoinhibited seeds of the high-dormancy cultivars and recording germination either in the light or with the gibberellins A4 and A7 (GA4/7) in the dark. Most Florida 683 seeds which failed to germinate in the homogenates after 15 days were induced to germinate by addition of N6-benzyladenine (BA). The presence of BA in addition to GA4/7 throughout incubation in the dark completely overcame the inhibitory effects of homogenates. This indicates that thermoinhibition of celery seeds is associated with the accumulation of a germination inhibitor which interacts with cytokinins. This does not appear to be abscisic acid (ABA) since ABA levels in thermoinhibited seeds were lower than in untreated seeds and did not increase with duration of high temperature treatment.Abbreviations ABA Abscisic acid - BA N6-benzyladenine - GA4/7 a mixture of the gibberellins A4 and A7 - HTP high-temperature pretreatment
Keywords:Apium graveolens  celery  seed thermoinhibition  germination inhibitor  abscisic acid
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