Viability, metabolic heat and respiration rates of paclobutrazol treated verbena and marigold seeds

This study was undertaken to determine whether soaking marigold (Tagetes patula L.) or verbena (Verbena x hybrida Voss.) seeds in various concentrations of paclobutrazol solution reduces the level of seed metabolism and seed viability. Tetrazolium tests demonstrated that verbena seeds soaked in solu...

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Bibliographic Details
Published in:Seed technology 2005, Vol.27 (2), p.223-229
Main Authors: Magnitskiy, S.V, Pasian, C.C, Burger, D.W, Bennett, M.A, Metzger, J.D
Format: Article
Language:English
Subjects:
carbon dioxide
cell respiration
gas exchange
Germination
Gibberellins
heat production
leaching
Metabolism
paclobutrazol
plant growth substances
plant physiology
Plants
Respiration
seed dormancy
seed treatment
Seedling emergence
Seedlings
Seeds
Tagetes patula
Thermogenesis
Verbena
Viability
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Summary:This study was undertaken to determine whether soaking marigold (Tagetes patula L.) or verbena (Verbena x hybrida Voss.) seeds in various concentrations of paclobutrazol solution reduces the level of seed metabolism and seed viability. Tetrazolium tests demonstrated that verbena seeds soaked in solutions of 50-500 mg·L-1 paclobutrazol were viable.Verbena or marigold seeds soaked in solutions of 10-500 mg·L-1 paclobutrazol had lower respiration and heat production rates than controls. These lower respiration rates were not found in washed verbena or marigold seeds suggesting that paclobutrazol had been leached from the seeds. Lowering seedling emergence in verbena with increasing paclobutrazol concentrations and corresponding inhibition of CO2 emission rates indicated that paclobutrazol imposed dormancy in verbena seeds.
ISSN:1096-0724