Genome Size Is a Strong Predictor of Root Meristem Growth Rate

Gruner, Adam; Hoverter, Nathan; Smith, Tylia; Knight, Charles

doi:10.1155/2010/390414

Cited by 28 publications

(27 citation statements)

References 16 publications

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“…Although our findings did not find a relationship between genome size and root growth rate, previous studies have shown a negative correlation between the two (Gruner et al, 2010). This was observed across species with large variation in genome size.…”

Section: Resultscontrasting

confidence: 97%

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Root kinematics in relation to temperature and genome size in wild and domesticated Zea.

Cromwell¹

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Root kinematics in relation to temperature and genome size in wild and domesticated Zea. Avery Bart CromwellWe studied root kinematics in relation to temperature and genome size variation in teosinte (Zea mays subspecies parviglumis) and corn (Zea mays subspecies mays). Corn had significantly faster radicle growth than teosinte when grown at a constant temperature. Both species exhibited variation in seed size and for each species larger seeds had faster root growth. Genome size was not significantly correlated with faster radicle growth rates across multiple land races of corn. To examine temperature dependent growth in corn and teosinte, a germinated seedling was grown at multiple temperatures. Growth rates at these temperatures were used to fit a temperature response model for each species. Parameters of this model (maximum growth temperature and optimum growth temperature) were not significantly different between the species.

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Section: Resultscontrasting

confidence: 97%

“…Gruner et al (2010) investigated root apical meristem growth in a number of species with varying genome size. They found that larger genome species had slower root apical meristem growth.…”

mentioning

confidence: 99%

Root kinematics in relation to temperature and genome size in wild and domesticated Zea.

Cromwell¹

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“…Gruner et al [33] report slower root growth in species with large genomes, which may be one factor of risk for endangered plant species. The analyses by Bennett et al [34] in weeds and nonweeds showed that weeds and especially the most aggressive weeds have smaller genomes than nonweeds, which indicates that competitive stress brings plants with larger genomes into a disadvantage.…”

Section: Journal Of Botanymentioning

confidence: 99%

Heavy Metal Pollution, Selection, and Genome Size: The Species of the Žerjav Study Revisited with Flow Cytometry

Temsch

Ehrendorfer-Schratt

et al. 2010

Journal of Botany

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The Death Valley atŽerjav in northern Slovenia exhibits a gradient of heavy metal pollution in the soil with severe consequences for species richness and composition along this gradient. Recently, a progressive loss of large-genome species in parallel with increasing concentrations of heavy metals has been shown. Here, we have measured the genome size of a near-complete sample of these species with flow cytometry and analysed the correlation of heavy metal pollution with the C-and Cx-values assigned to the test plots. The method of probability analysis was a hypergeometric distribution method. We confirm, on a different methodological basis than previously, that along the pollution gradient, species with high C-and Cx-values are increasingly underrepresented. This lends support to the "large genome constraint hypothesis", predicting that plants with large genomes are at a disadvantage under all aspects of evolution, ecology, and phenotype, because junk DNA imposes a load to the organism.

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“…According to the LGCH, species with large genomes are disadvantaged owing to the costs associated with accumulation and replication of non-coding repetitive DNA. The strongest support for this hypothesis is the correlation between GS and cell size [3,5,12,13] as well as between GS and cell cycle duration [6,14].…”

Section: Introductionmentioning

confidence: 99%

“…Angiosperms with larger genomes often have lower specific leaf areas and, consequently, lower maximum photosynthetic rate [5,11] and lower growth rate [14,15], possibly owing to the competition for phosphorus between DNA and RNA [16]. At the same time, GS in herbs is often associated with larger seed mass [12,17,18] and leaf lifespan [19].…”

Section: Introductionmentioning

confidence: 99%

Geometrical constraints in the scaling relationships between genome size, cell size and cell cycle length in herbaceous plants

Šímová

Herben

2011

Proc. R. Soc. B.

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Plant nuclear genome size (GS) varies over three orders of magnitude and is correlated with cell size and growth rate. We explore whether these relationships can be owing to geometrical scaling constraints. These would produce an isometric GS-cell volume relationship, with the GS-cell diameter relationship with the exponent of 1/3. In the GS-cell division relationship, duration of processes limited by membrane transport would scale at the 1/3 exponent, whereas those limited by metabolism would show no relationship. We tested these predictions by estimating scaling exponents from 11 published datasets on differentiated and meristematic cells in diploid herbaceous plants. We found scaling of GS-cell size to almost perfectly match the prediction. The scaling exponent of the relationship between GS and cell cycle duration did not match the prediction. However, this relationship consists of two components: (i) S phase duration, which depends on GS, and has the predicted 1/3 exponent, and (ii) a GS-independent threshold reflecting the duration of the G1 and G2 phases. The matches we found for the relationships between GS and both cell size and S phase duration are signatures of geometrical scaling. We propose that a similar approach can be used to examine GS effects at tissue and whole plant levels.

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Genome Size Is a Strong Predictor of Root Meristem Growth Rate

Cited by 28 publications

References 16 publications

Root kinematics in relation to temperature and genome size in wild and domesticated Zea.

Root kinematics in relation to temperature and genome size in wild and domesticated Zea.

Heavy Metal Pollution, Selection, and Genome Size: The Species of the Žerjav Study Revisited with Flow Cytometry

Geometrical constraints in the scaling relationships between genome size, cell size and cell cycle length in herbaceous plants

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