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- W2150403789 abstract "ABSTRACT Carrot ( Daucus carota ) seed germination can be erratic or reduced under high temperatures above 35oC.Priming circumvents seed thermoinhibition in several crops, including carrot. The involvement of ethylene in germination at supra-optimal temperatures has been reported in other species, but its role in carrot seed germination has not been examined. The main objective of this study was to determine whether priming-mediated improvement in carrot seed germination at high temperature was associated with increased ethylene production. Seeds of two tropical carrot genotypes (‘Alvorada’ and ’Brasilia’) were incubated over a range of temperatures. ‘Brasilia’ seeds were primed for 72 hours in aerated PEG solutions at 15oC under light conditions and germination tested at 20 and 35oC. Seeds of a thermosensitive genotype ‘Arrowhead’ were primed for 0, 4, 8 and 12 days in aerated PEG solutions at 15oC under light conditions. Seeds were incubated at 20 and 35oC, and ethylene production was measured immediately before visible radicle protrusion. Temperatures above 30⁰C decreased seed germination percentage of ‘Alvorada’ and ‘Brasilia’. Priming increased ‘Brasilia’ seed germination at 35oC. ‘Arrowhead’ germinated 96% at 20oC, and 13% at 35oC. Seed germination and ethylene production in a ‘Arrowhead’, a thermosensitive genotype increased in response to increased duration of primimng. The results suggest that seed priming circumvents thermoinhibition of carrot seed germination by increasing ethylene production at high temperatures. Keywords: Daucus carota L., thermotolerance, stand establishment, vigor, cultivars." @default.
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- W2150403789 date "2013-12-20" @default.
- W2150403789 modified "2023-09-26" @default.
- W2150403789 title "Carrot seed germination and ethylene production at high temperature in response to seed osmopriming" @default.
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- W2150403789 doi "https://doi.org/10.1590/hb.v31i4.139" @default.
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