Abstract:
:The nutrient limitation hypothesis provides a nongenetic explanation for the evolution of life cycles that retain both haploid and diploid phases: differences in nutrient requirements and uptake allow haploids to override the potential genetic advantages provided by diploidy under certain nutrient limiting conditions. The relative fitness of an isogenic series of haploid, diploid and tetraploid yeast cells (Saccharomyces cerevisiae), which were also equivalent at the mating type locus, was measured. Fitness was measured both by growth rate against a common competitor and by intrinsic growth rate in isolated cultures, under four environmental conditions: (1) rich medium (YPD) at the preferred growth temperature (30 °C); (2) nutrient poor medium (MM) at 30 °C; (3) YPD at a nonpreferred temperature (37 °C); and (4) MM at 37 °C. In contrast to the predictions of the nutrient limitation hypothesis, haploids grew significantly faster than diploids under nutrient rich conditions, but there were no apparent differences between them when fitness was determined by relative competitive ability. In addition, temperature affected the relative growth of haploids and diploids, with haploids growing proportionately faster at higher temperatures. Tetraploids performed very poorly under all conditions compared. Cell geometric parameters were not consistent predictors of fitness under the conditions measured.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Mable BKdoi
10.1046/j.1420-9101.2001.00245.xsubject
Has Abstractpub_date
2001-01-08 00:00:00pages
157-170issue
1eissn
1010-061Xissn
1420-9101journal_volume
14pub_type
杂志文章abstract::Certain types of asexual reproduction lead to loss of complementation, that is unmasking of recessive deleterious alleles. A theoretical measure of this loss is calculated for apomixis, automixis and endomitosis in the cases of diploidy and polyploidy. The effect of the consequent unmasking of deleterious recessive mu...
journal_title:Journal of evolutionary biology
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journal_title:Journal of evolutionary biology
pub_type: 杂志文章
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pub_type: 杂志文章
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abstract::Although adaptive divergence along environmental gradients has repeatedly been demonstrated, the role of post-glacial colonization routes in determining phenotypic variation along gradients has received little attention. Here, we used a hierarchical QST -FST approach to separate the roles of adaptive and neutral proce...
journal_title:Journal of evolutionary biology
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abstract::Although numerous studies have attempted to find single unifying mechanisms for generating Madagascar's unique flora and fauna, little consensus has been reached regarding the relative importance of climatic, geologic and ecological processes as catalysts of diversification of the region's unique biota. Rather, recent...
journal_title:Journal of evolutionary biology
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journal_title:Journal of evolutionary biology
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abstract::Ecologically important traits of insects are often affected by facultative bacterial endosymbionts. This is best studied in the pea aphid Acyrthosiphon pisum, which is frequently infected by one or more of eight facultative symbiont species. Many of these symbiont species have been shown to provide one ecological bene...
journal_title:Journal of evolutionary biology
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journal_title:Journal of evolutionary biology
pub_type: 杂志文章
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abstract::Large genetic variations in starvation tolerance in animals indicate that there are multiple strategies to cope with low-nutrient conditions. Fruit flies (Drosophila melanogaster) typically respond to starvation by suppressing sleep and enhancing locomotor activity presumably to search for food. However, we hypothesiz...
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journal_title:Journal of evolutionary biology
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journal_title:Journal of evolutionary biology
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abstract::In a simulation model we investigated how much of the initial genetic variation that is retained in a population after a dominant mutation has brought apomixis to fixation in it. A marker allele associated with the apomixis mutation is generally retained after the fixation of apomixis, particularly if the two alleles ...
journal_title:Journal of evolutionary biology
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abstract::The late Pleistocene was a time of environmental change, culminating in an extinction event. Few fossil localities record a temporal series of carnivore fossil populations from this interesting interval as well as Rancho La Brea (RLB). We analysed mandibles of Smilodon fatalis from RLB using 2-D geometric morphometric...
journal_title:Journal of evolutionary biology
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journal_title:Journal of evolutionary biology
pub_type: 杂志文章
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更新日期:2004-07-01 00:00:00
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更新日期:2018-04-01 00:00:00
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journal_title:Journal of evolutionary biology
pub_type: 杂志文章
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更新日期:2004-05-01 00:00:00
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journal_title:Journal of evolutionary biology
pub_type: 杂志文章
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更新日期:2005-09-01 00:00:00