Original Research

Evidence that thermoinhibition and the alleviation thereof by oxygen plus kinetin in Great Lakes lettuce seed is related to mitochondrial function

J. G. C. Small
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 15, No 1 | a626 | DOI: https://doi.org/10.4102/satnt.v15i1.626 | © 1996 J. G. C. Small | This work is licensed under CC Attribution 4.0
Submitted: 10 July 1996 | Published: 10 July 1996

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J. G. C. Small,, South Africa

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Thermoinhibition of Lactuca sativa L.cv. Great Lakes 659 seeds occurred at 36 ˚C. Thermoinhibition was alleviated by a combi­nation of 100% O₂ and kinetin (10 mg dm⁻³). Chloramphenicol nullified the effect of O₂ plus kinetin. A number of mitochondrial activities (respiration, coupling, certain matrix enzyme activities and incorporation of [³⁵S]- methionine in mitochondrial proteins) were lower in thermoinhibited than in seeds imbibed at 25 ˚C. Treating seeds with plus kinetin at 36 °C restored these mitochondrial activities to the same or in some cases, to higher levels than in 25 °C control seeds.


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