Wounding stimulates cyanide-sensitive respiration in the highly cyanide-resistant leaves of Bryophyllum tubiflorum Harv

The rate of respiration in sectioned leaves of Bryophyllum tubiflorum Harv. increases with decreasing section thickness. The rates of uninhibited respiration in 2- and 8-millimeter-thick sections are 74 and 46 microliters of O2 per gram fresh weight of unruptured tissue per hour at 20 C, whereas the...

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Published inPlant physiology (Bethesda) Vol. 65; no. 2; pp. 409 - 410
Main Authors Kinraide, Thomas B., Laura F. Marek
Format Journal Article
LanguageEnglish
Published United States American Society of Plant Physiologists 01.02.1980
Subjects
Cyanide resistant respiration
Cyanide sensitive respiration
Cyanides
Flasks
Leaves
Plant tissues
Plants
Respiration
Short Communications
Tubers
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Summary:The rate of respiration in sectioned leaves of Bryophyllum tubiflorum Harv. increases with decreasing section thickness. The rates of uninhibited respiration in 2- and 8-millimeter-thick sections are 74 and 46 microliters of O2 per gram fresh weight of unruptured tissue per hour at 20 C, whereas the rate in the presence of cyanide is 31 microliters of O2 in each case. The rates are unaffected by salicylhydroxamic acid, but cyanide and salicylhydroxamic acid together completely eliminate O2 uptake. The capacity of the alternative respiratory pathway is thus initially high (estimated at 84% of the uninhibited respiratory rate in whole leaves) and remains constant but probably unexpressed subsequent to the rapid induction of wound respiration.
Bibliography:F60
F
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.65.2.409