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Title Nature of ozone resistance in Bel-B tobacco
Creator/Author Rhoads, A.F.
Publication Date1976 Jan 01
OSTI IdentifierOSTI ID: 5196052
Resource TypeThesis/Dissertation
Resource RelationThesis (Ph.D)
Research OrgRutgers--the State Univ., New Brunswick, NJ (USA)
Subject560303 -- Chemicals Metabolism & Toxicology-- Plants-- (-1987) ;500200 -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (-1989); LEAVES-- ULTRASTRUCTURAL CHANGES;NICOTIANA-- ULTRASTRUCTURAL CHANGES;OZONE-- BIOLOGICAL EFFECTS; CELL MEMBRANES;CHLOROPLASTS;EXPERIMENTAL DATA;GRAFTS;MOISTURE;NEW JERSEY;PHOTOSYNTHESIS;POTASSIUM;ROOTS;SENSITIVITY;STOMATA
Related SubjectALKALI METALS;CELL CONSTITUENTS;CHEMICAL REACTIONS;DATA;ELEMENTS;FEDERAL REGION II;INFORMATION;MEMBRANES;METALS;MORPHOLOGICAL CHANGES;NORTH AMERICA;NUMERICAL DATA;OPENINGS;PHOTOCHEMICAL REACTIONS;PLANTS;SYNTHESIS;TRANSPLANTS;USA
Description/Abstract Two cultivars of cigar wrapper tobacco, Bel-W3, ozone sensitive, and Bel-B, ozone-resistant, were used to examine the nature of ozone resistance in Bel-B.^Through the use of reciprocal grafts it was shown that root system characteristics do not determine foliar response to ozone.^A mechanism for exclusion of ozone from the leaf was ruled out as no differences were found between the cultivars in terms of either stomatal frequency or stomatal aperture.^Although alterations in chloroplast ultrastructure and function have been detected early after ozone treatment of intact plants, isolated chloroplast lamellae from Bel-B and Bel-W3 tobacco leaves were equally sensitive to ozone in vitro.^Enzymatically separated leaf mesophyll cells of the two cultivars were exposed to ozone in vitro and were found to be equally sensitive to ozone treatment when oxygen evolution was the criterion.^Measurements of water influx rates for leaf discs from the two cultivars indicated that water influx decreased with ozone treatment in both cultivars in proportion to the amount of visible leaf injury which developed.^Both water influx and water efflux rates of untreated Bel-B discs were greater than those of Bel-W3.^This may be indicative of differences in membrane properties which are significant in the development of ozone damage.^Potassium content of individual leaves was found to be positively correlated with greater ozone sensitivity both within and between cultivars.^When intercellular volume of leaves of comparable age of Bel-W3 and Bel-B tobacco was measured, Bel-W3 leaves were found to be slightly more porous.^This may allow for greater accessibility of sensitive sites to ozone.^53 references.
PublisherRutgers-the State University,New Brunswick, NJ
Country of PublicationUnited States
LanguageEnglish
FormatPages: 83
AvailabilityUniversity Microfilms Order No. 77,07,272.
System Entry Date2001 May 13

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