POPULATION STUDIES ON LEAD-TOLERANT <i>AGROSTIS TENUIS</i>

Jowett, D.

doi:10.1111/j.1558-5646.1964.tb01569.x

Cited by 85 publications

(22 citation statements)

References 16 publications

Supporting

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“…In pure stands the tolerant ecotype in each of the three species tested has a lower dry weight and fewer tillers or leaves than the non tolerant ecotype. These results are in agreement with those obtained by Jowett (1964) in Agrostis tenuis, Antonovics and Bradshaw (1970) in Anthoxanthum odoratum and Schwanitz and Hahn (1954) in several metal tolerant species (Alsine verna, Silene cucubalus, Cam panula rotundijolia, Plantago lanceolata). These authors have shown that a smaIl habit is characteristic of metal tolerant ecotypes in those species.…”

Section: Discussionsupporting

confidence: 92%

“…Metal tolerant plant populations have been shown to be genetically distinct from non metal tolerant populations in their physiological, reproductive and morphological features by several authors (e.g., Bradshaw, 1952;Broker, 1963;Gregory and Bradshaw, 1964;Jowett, 1964;Antonovics, 1968;Lefebvre, 1970). They have also been shown to be ecologically restricted in that metal tolerant ecotypes of Agrostis tenuis Sibth., and Anthoxanthum odoratum L., have been found to occur almost exclusively on metal contaminated soils, (Jain and Bradshaw, 1966;McNeilly, 1968;Antonovics and Bradshaw, 1971).…”

mentioning

confidence: 99%

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Competition Between Metal Tolerant and Normal Plant Populations on Normal Soil

Cook¹,

Lefèbvre²,

McNeilly³

1972

Evolution

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Section: Discussionsupporting

confidence: 92%

mentioning

confidence: 99%

Competition Between Metal Tolerant and Normal Plant Populations on Normal Soil

Cook¹,

Lefèbvre²,

McNeilly³

1972

Evolution

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“…Plantain has been shown to evolve tolerance to Zn (Schwanitz and Hahn 1954) on Zn contaminated mine soil and has been recorded in mine areas polluted with high Pb levels (Wild 1970); Pb tolerance has not been previously demonstrated in this species. The Pb levels used in the rooting test of the different Bermuda grass populations were of th~ same order of magnitude as those used in Pb tolerance testing of other grasses from metal mines (Jowett 1964); in comparison with tolerant grasses from such metal mines, the roadside Bermuda grass shows an extremely low tolerance. It appears that the differential evolutionary response of the two species may be related to their sensitivity to Pb.…”

Section: Discussionmentioning

confidence: 88%

“…To examine further the apparent lack of enhanced lead tolerance in Bermuda grass from the roadside, the experiment was repeated using a tiller rooting test such as is normally used for testing metal tolerance of grasses (Jowett 1964). Two other populations, one from Crandon Park, Miami, Florida and one from farmland in Cook County, Georgia were included in this test to see if the Durham populations in general had a higher Pb tolerance than populations from other areas.…”

Section: Methodsmentioning

confidence: 99%

Experimental Ecological Genetics in Plantago II. Lead Tolerance in Plantago Lanceolata and Cynodon Dactylon from a Roadside

Antonovics¹

1976

Ecology

102

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A population of Plantago lanceolata (ribwort plantain) from a roadside was found to have higher Pb tolerance than populations away from the roadside; this reflected the sharp differences in Pb content of the soil and the plants at these sites. Tolerance tests on seedlings showed that the Pb tolerance was transmitted to seed progeny. Cynodon dactylon (Bermuda grass) showed generally a higher Pb tolerance than P. lanceo!ata, but there was no evidence of a greater Pb tolerance of the roadside population when compared with populations from control sites. These results suggest that the Pb level found at the roadside was sufficiently high to impose selection pressure for the evolution of tolerance in a sensitive species, but no overt effect was seen in a species with a greater inherent tolerance. This provides another example of rapid and highly localized evolutionary change in plants.

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“…This was unexpected both because of the potential for gene flow in a large outcrossing species, and because "…climatic factors are generally highly variable in time, but less variable over short distances" (Snaydon 1970). There are exceptions (Aston and Bradshaw 1966), but usually, abrupt breaks are associated with edaphic or management variables (Jowett 1964;Snaydon and Davies 1976), which were not operating here. Historical evidence indicates that ponderosa pine occupied its present range relatively recently (Conkle and Critchfield 1988;Lauria 1991).…”

Section: Differentiation Between Regionsmentioning

confidence: 86%

Role of selection versus historical isolation in racial differentiation of ponderosa pine in southern Oregon: an investigation of alternative hypotheses

Sorensen¹,

Mandel²,

Aagaard³

2001

Can. J. For. Res.

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Continuous populations identified as Pacific and North Plateau races of ponderosa pine (Pinus ponderosa P. Laws. ex C. Laws.) are parapatric along the crest of the Cascade Range in southern Oregon. A 3-year common-garden study of bud phenology and seedling vigor was performed to estimate the nature and magnitude of differentiation between races, to characterize the transition zone between them, and to relate responses between and within races to topography and climate. Principal component (PC) analyses identified two significant character complexes, PC-1 (phenological traits) and PC-2 (size traits), that explained 73% of the geographic race-related variation. The races were differentiated in two regards. First, PC-1 scores, which were highly correlated with frost-free season and summer-winter temperature differential, displayed a sharp discontinuity in the transition zone. Second, PC-2 scores were significantly correlated with physiographic and climatic variables in the North Plateau but not in the Pacific race, even though these variables had greater ranges in the latter. The data supported a narrow, adaptive transition between races for a complex of traits probably related to cold hardiness, and provided evidence that plant vigor traits were more closely adapted to environments in the North Plateau than in the Pacific region, possibly as a consequence of past climatic-stress selection in the former and competitive-stress selection in the latter.Résumé : Les races du Pacifique et du Plateau du Nord qu'on distingue parmi les populations continues de pin ponderosa (Pinus ponderosa P. Laws. ex C. Laws.) sont parapatriques le long de la crête de la chaîne des Cascades dans le Sud de l'Oregon. À l'aide d'une étude en plantation comparative menée pendant 3 ans, les auteurs ont étudié la phénologie du bourgeon et la vigueur des semis afin d'évaluer la nature et l'ampleur de la différenciation des races, de caractériser la zone de transition entre ces dernières, et d'établir le lien entre d'une part le climat et la topographie et d'autre part les différences de réponse au sein des races et entre ces dernières. L'analyse en composantes principales (CP) a permis d'identifier deux groupes de caractères significatifs, CP-1 (les caractères phénologiques) et CP-2 (les caractères de dimension), qui expliquent 73% de la variation géographique liée aux races. Les races sont différenciées de deux manières. D'une part, les valeurs obtenues sur CP-1, qui sont fortement corrélées avec la longueur de la période sans gel et la différence de température entre l'été et l'hiver, montrent une forte discontinuité dans la zone de transition. En second lieu, les valeurs obtenues sur CP-2 sont corrélées significativement avec les variables physiographiques et climatiques chez la race du Plateau du Nord, ce qui n'est pas le cas pour la race du Pacifique et ce, même si ces variables montrent de plus grands écarts chez cette dernière. Les données supportent le concept d'une zone de transition étroite liée à l'adaptation entre ces deux races et c...

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POPULATION STUDIES ON LEAD-TOLERANT AGROSTIS TENUIS

Cited by 85 publications

References 16 publications

Competition Between Metal Tolerant and Normal Plant Populations on Normal Soil

Competition Between Metal Tolerant and Normal Plant Populations on Normal Soil

Experimental Ecological Genetics in Plantago II. Lead Tolerance in Plantago Lanceolata and Cynodon Dactylon from a Roadside

Role of selection versus historical isolation in racial differentiation of ponderosa pine in southern Oregon: an investigation of alternative hypotheses

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