Seasonal Variation of Isozymes in Juniperus scopulorum: Systematic Significance

Kelley, Walter A.; Adams, Robert P.

doi:10.2307/2442165

Cited by 12 publications

(3 citation statements)

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“…Certainly in lichens where cross-breeding experiments which could confirm isoenzyme differences are as yet impossible, interpretations of isoenzyme variability should be made with caution. There are other serious potential problems with the seasonal variation found in isoenzymes (McCowan et al, 1969;De Jong, 1973;Kelley and Adams, 1977b;Krasnuk et al, 1978a, b;Verkley and Zuetenhorst, 1980; for example) and certainly no seasonal control has been attempted here.…”

Section: Discussionmentioning

confidence: 99%

“…The pellets were resuspended in a minimal volume of 0-05 M phosphate buffer, pH 6-8 and desalted by gel filtration on a column of Sephadex G25 (Pharmacia Fine Chemicals, Dorval, Quebec) (2-6 x 40 cm) previously equilibrated with 0-05 M phosphate column buffer. Protein fractions were concentrated by dialysis with sucrose according to the method of Kelley and Adams (1977b). Following dialysis, all samples were stored at 4 °C until electrophoresis.…”

Section: Enzyme Extractionmentioning

confidence: 99%

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Physiological‐environmental Interactions in Lichens

1983

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SUMMARY Despite the contrasting thermal and light environment of sun and shade ecotypes of Cladonia rangiferina, analysis of the pattern of net photosynthesis throughout the year as well as enzyme polymorphism in each morphotype has found little genotypic difference. The large disparity between photosynthetic capacity in the sun and shade replicates is shown to be due simply to a difference in chlorophyll content. There is a significant decline in photosynthetic capacity in November and this is found to be reversible uncoupling of photosynthetic units (PU's) during the winter period. The control of coupling and uncoupling of PU's is shown to be mediated by both daylength and thallus temperatures, and a double environmental signal in June and July of short days coupled to low temperature will initiate and finalize the event within 12 h. This response pattern is discussed in relation to identical capacity changes in other lichen species. Apart from a single isoenzyme difference in esterase polymorphism, no differences in the zymograms of leucine aminopeptidase, phosphoglucoisomerase, or acid phosphatase were detected and this overall genetic homogeneity was equally evident in a general protein gel. This unexpected degree of homogeneity is discussed in terms of the difficulties in assessing enzyme polymorphisms in different plant populations without maximum refinement of protein preparation methods and electrophoretic techniques. It is concluded that the two quite distinct sun and shade morphotypes only reflect phenotypic differences. In contrast however significant differences are reported in the distribution of specific enzymes between the tops and bases of the podetia.

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Section: Discussionmentioning

confidence: 99%

Section: Enzyme Extractionmentioning

confidence: 99%

Physiological‐environmental Interactions in Lichens

1983

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“…Ces variations quantitatives ont pu être mises en rapport avec des changements dans les caractéristiques des enzymes (changements conformationnels des molécules protéiques) ou bien la synthèse de constituants nouveaux. Chez d'autres espèces, au contraire (Génévrier), l'accroissement de la quantité de ces enzymes ne s'accompagne pas de variations qualitatives (55).…”

Section: --Variations Observées Dans D'autres Structures Cellulairesunclassified

Etude de quelques aspects de l'alternance saisonnière, chez les Végétaux

Vintéjoux

Dereuddre

1981

Bulletin de la Société Botanique de France. Actualités Botaniqu

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This review indicates the main results ohtained during the last years concerning seasonal plant variations. The first part relates severa! physiological states of plants, or plant organs, according to seasons (rest period, dormancy, active period ... ). The other parts report cytological studies in different tissues in relation with their activity state and with climatic factors ( cold, drought. .. ). The rest period and the active period differ by topographie and structural characteristics of severa! cel! organelles (nucleus, endoplasmic reticulum, plastids ... ) and by functional modifications ( enzymatic, mitotic and photosynthetic activities).

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Electrophoretic and Gas Exchange Patterns of Two Populations of Peltigera Rufescens

Brown

Kershaw

1985

Lichen Physiology and Cell Biology

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Seasonal Variation of Isozymes in Juniperus scopulorum: Systematic Significance

Cited by 12 publications

References 0 publications

Physiological‐environmental Interactions in Lichens

Physiological‐environmental Interactions in Lichens

Etude de quelques aspects de l'alternance saisonnière, chez les Végétaux

Electrophoretic and Gas Exchange Patterns of Two Populations of Peltigera Rufescens

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