Increased ecological amplitude through heterosis following wide outcrossing in <i>Banksia ilicifolia</i> R.Br. (Proteaceae)

Heliyanto, Bambang; Krauss, Siegfried L.; Lambers, Hans; Cawthray, Gregory R.; Veneklaas, Erik J.

doi:10.1111/j.1420-9101.2005.01067.x

Cited by 15 publications

(11 citation statements)

References 51 publications

(63 reference statements)

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“…; O'Brien and Krauss ; Travis and Grace ) within and beyond the threshold geographic distance for habitat‐matched and unmatched populations, as well as cross‐pollination studies at this scale to assess the mating consequences of mixing provenances (Heliyanto et al. ; Hufford et al. ).…”

Section: Discussionmentioning

confidence: 99%

An ecological genetic delineation of local seed‐source provenance for ecological restoration

Krauss

Sinclair

Bussell

et al. 2013

Ecology and Evolution

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An increasingly important practical application of the analysis of spatial genetic structure within plant species is to help define the extent of local provenance seed collection zones that minimize negative impacts in ecological restoration programs. Here, we derive seed sourcing guidelines from a novel range-wide assessment of spatial genetic structure of 24 populations of Banksia menziesii (Proteaceae), a widely distributed Western Australian tree of significance in local ecological restoration programs. An analysis of molecular variance (AMOVA) of 100 amplified fragment length polymorphism (AFLP) markers revealed significant genetic differentiation among populations (ΦPT = 0.18). Pairwise population genetic dissimilarity was correlated with geographic distance, but not environmental distance derived from 15 climate variables, suggesting overall neutrality of these markers with regard to these climate variables. Nevertheless, Bayesian outlier analysis identified four markers potentially under selection, although these were not correlated with the climate variables. We calculated a global R-statistic using analysis of similarities (ANOSIM) to test the statistical significance of population differentiation and to infer a threshold seed collection zone distance of ∼60 km (all markers) and 100 km (outlier markers) when genetic distance was regressed against geographic distance. Population pairs separated by >60 km were, on average, twice as likely to be significantly genetically differentiated than population pairs separated by <60 km, suggesting that habitat-matched sites within a 30-km radius around a restoration site genetically defines a local provenance seed collection zone for B. menziesii. Our approach is a novel probability-based practical solution for the delineation of a local seed collection zone to minimize negative genetic impacts in ecological restoration.

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Section: Discussionmentioning

confidence: 99%

An ecological genetic delineation of local seed‐source provenance for ecological restoration

Krauss

Sinclair

Bussell

et al. 2013

Ecology and Evolution

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“…Crossings between plants from different populations may further improve fitness compared to selfed offspring through heterosis [14], [15], [22], [38], [51], which may mitigate some of the adverse effects of inbreeding in populations [52], but can also have adverse effects through outbreeding depression [53].…”

Section: Discussionmentioning

confidence: 99%

Inbreeding Depression under Drought Stress in the Rare Endemic Echium wildpretii (Boraginaceae) on Tenerife, Canary Islands

et al. 2012

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How climate-change induced environmental stress may alter the effects of inbreeding in patchy populations of rare species is poorly understood. We investigated the fitness of progeny from experimental self- and cross-pollinations in eight populations of different size of Echium wildpretii, a rare endemic plant of the arid subalpine zone of the Canarian island of Tenerife. As control treatments we used open pollination and autonomous selfing. The seed set of open-pollinated flowers was 55% higher than that of autonomously selfed flowers, showing the importance of animal pollination for reproductive success. The seed set, seed mass and germination rate of seedlings of hand-selfed flowers was similar to that of hand-crossed flowers, indicating weak inbreeding depression (seed set –4.4%, seed mass –4.1%, germination –7.3%). Similarly, under normal watering there were no significant effects of inbreeding on seedling survival (–3.0%). However, under low watering of seedlings inbreeding depression was high (survival –50.2%). Seed set of open- and hand-outcrossed-pollinated flowers was higher in large than in small populations, possibly due to more frequent biparental inbreeding in the latter. However, later measures of progeny fitness were not significantly influenced by population size. We predict that increasing drought duration and frequency due to climate change and reductions of population sizes may increase inbreeding depression in this charismatic plant species and thus threaten its future survival in the longer term.

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“…For species such as this with a strong population structure in the native range, the multiple introduction and admixture of previously isolated lineages can increase the genetic variation of introduced populations by the conversion of between‐ to within‐population genetic variation (Taylor & Keller, 2007). Greater recombination within introduced populations could lead to a larger ecological amplitude through hybrid vigour (increased heterozygosity) and by exposing novel genetic combinations to selection (Holt et al ., 2005; Heliyanto et al ., 2006). The likelihood of observing such an effect is therefore higher for an inbreeding species than an out‐crossing species for which most genetic combinations have already been ‘tried and tested’.…”

Section: Discussionmentioning

confidence: 99%

Contrasting patterns of genetic variation and structure in plant invasions of mountains

Alexander

Poll

Dietz

et al. 2009

Diversity and Distributions

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AimTo assess the population genetic consequences of the colonization of two species with contrasting mating systems, Solidago canadensis and Lactuca serriola , along altitudinal gradients in both their native and introduced ranges.Location Allegheny Mountains, West Virginia and Wallowa Mountains, Oregon, USA; Valais, southern Switzerland.Methods Leaf material was collected from populations along altitudinal gradients and genotyped at seven microsatellite loci for each species. Differences in variability between native and introduced areas and in relation to altitude were analysed using linear models. Differences in the genetic, geographical and altitudinal structure of populations between areas were analysed by AMOVA , cluster analysis and Mantel tests.Results Genetic variation within and across populations of S. canadensis was significantly reduced, while populations of L. serriola were significantly more variable, in the introduced area. Genetic diversity decreased significantly with altitude for S. canadensis but not L. serriola . Genetic structure of S. canadensis was similar in both areas, and populations were isolated by geographical but not altitudinal distance. By contrast, population structure of L. serriola was much weaker in the introduced area, and populations were not isolated by distance in either area. Main conclusionsSolidago canadensis has experienced a strong genetic bottleneck on introduction to the Valais, but this has not prevented it from colonizing a wide altitudinal range. Variation in neutral markers is therefore not necessarily a good measure for judging the ecological behaviour of a species. By contrast, the greater variability of L. serriola in the introduced area, where it also occurs over a greater altitudinal range, can be explained by increased outcrossing among admixed populations. This suggests that the ecological amplitude of alien species might be enhanced after population admixture in the new range, especially for species with highly structured native populations. However, even genetically depauperate introduced populations can be expected to colonize the same environmental range that they occupy in the native area.

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Increased ecological amplitude through heterosis following wide outcrossing in Banksia ilicifolia R.Br. (Proteaceae)

Cited by 15 publications

References 51 publications

An ecological genetic delineation of local seed‐source provenance for ecological restoration

An ecological genetic delineation of local seed‐source provenance for ecological restoration

Inbreeding Depression under Drought Stress in the Rare Endemic Echium wildpretii (Boraginaceae) on Tenerife, Canary Islands

Contrasting patterns of genetic variation and structure in plant invasions of mountains

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