Natural Selection in Action in Eucalyptus

Barber, H. N.; Jackson, W. D.

doi:10.1038/1791267a0

Cited by 88 publications

(52 citation statements)

References 8 publications

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“…If allowance is made for the scale of dispersal it may also be found in species with high levels of dispersal. Thus Barber and Jackson (1957) found marked dines in Eucalyptus despite dispersal of pollen over considerable distances by birds. Ford (1964, p. 43) and Barber and Jackson (i,7) emphasise that although it was once considered that complete isolation is necessary for race formation, it is now clear that the selection pressures which normally maintain and adjust the characters of wild populations are powerful enough for differentiation to occur between geographically contiguous populations.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

1966

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Section: Discussionmentioning

confidence: 99%

Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

1966

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“…Whitecross (1963) and Daly (1964) have also demonstrated increased wax on plants grown at low temperatures while Barber and Jackson (1957) citeincreasedglaucousness of E. urnigera Hook. with increasing altitude as an example of clinal variation.…”

Section: Discussionmentioning

confidence: 99%

Leaf Characteristics of Euoalyptus Bicostata Maiden Et Al. Seedlings Affecting the Deposition and Germination of Spores of Phaeoseptoria Eucalypti (Hansf.) Walker

Heatrer¹

1967

Aust. Jnl. Of Bio. Sci.

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SummaryThe water·soluble fraction of the ether·soluble moiety of the glaucous coating on the juvenile leaves of seedlings of Eucalyptus bicostata Maiden et al. inhibited the in vitro germination of the conidia of Phaeoseptoria eucalypti (Hansf.) Walker. A negative correlation was obtained between susceptibility of leaves to P. eucalypti leaf spot and the weight per unit leaf area of ether-soluble substances also soluble in water. Glaucousness of seedling leaves and inhibition of spore germination both increased acropetally, glaucousness also increasing when seedlings were raised at lower temperatures. The glaucous coating of leaves was strongly hydrophobic and affected the deposition of conidia from water suspensions as did the leaf angle.Hydrophobicity of glaucous surfaces and leaf angle are probably more important than chemical inhibition of spore germination in affecting field infection of E. bicostata leaves by P. eucalypti.

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“…Moore 1959;Parsons and Specht 1967;Parsons 1968Parsons , 1969Ashton 1976Ashton , 1981) and the popu-lation level (e.g. Barber 1955Barber , 1965Barber and Jackson 1957;Pryor 1957Pryor , 1976Ladiges and Ashton 1974;Ladiges 1978, 1982;and others). Differences in fitness are demonstrated between extreme morphs along the major clines on the Central Plateau, suggesting that selection is a significant factor in maintaining genetic differentiation in the more or less continuous stands.…”

Section: Discussionmentioning

confidence: 99%

Variation in the Eucalyptus gunnii-archeri Complex. III. Reciprocal Transplant Trials

Potts¹

1985

Aust. J. Bot.

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Two multicharacter clines in the more or less continuous stands of Eucalyptus gunnii-archeri on the Central Plateau, Tasmania, are genetically based and appear to parallel independent habitat gradients. Results from experimental gardens established near the extremes of each cline suggest that these clines are at least partly maintained by spatially varying selective forces. Spatial variation in population fitness could be partly attributed to a differential response to drought, frost and insect predation. Most characters associated with extension growth (e.g. height, internode length, leaf size) exhibited marked phenotypic plasticity. In contrast, several characters of taxonomic importance in the complex, and which vary markedly between populations (e.g. seedling leaf shape, glaucousness), exhibited little environmental modification. The ontogenetic pattern varied between populations and, for many charac- ters, the direction of environmental modification was the same as the direction of genetic differentiation.

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Natural Selection in Action in Eucalyptus

Cited by 88 publications

References 8 publications

Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

Leaf Characteristics of Euoalyptus Bicostata Maiden Et Al. Seedlings Affecting the Deposition and Germination of Spores of Phaeoseptoria Eucalypti (Hansf.) Walker

Variation in the Eucalyptus gunnii-archeri Complex. III. Reciprocal Transplant Trials

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