Seed Dormancy and Factors Controlling Dormancy Breakdown in Buffel Grass Accession from Contrasting Provenances

Hacker, J. B.; Ratcliff, D.

doi:10.2307/2403661

Cited by 52 publications

(34 citation statements)

References 5 publications

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“…Winkworth (1971) 1-2 Yadav et al (1974) 14-51 per 2 cm spike length 7)0-12)3 Nicholson et al (1985) 0)520-0)980 Hacker & Ratcliff (1989) 1-4 for individual clusters of the same introduction Hacker & Ratcliff (1989) 0)58-2)15 averages per introduction from Southern Africa Pengelly et al (1992) 1)70-1)01 averages per grouping of accessions Neffati (1994) 1-2 1)0006…”

Section: Cenchrus Ciliaris In North Africamentioning

confidence: 99%

“…Sometimes, but not always, desert ecotypes have been shown to exhibit greater phenotypic plasticity in phenological development (Aronson et al, 1992(Aronson et al, , 1993. In the case of C. ciliaris, there would be extensive ecotypic variation with regard to seed dormancy and germination capacity (Butler, 1985;Hacker & Ratcliff, 1989;Venter & Rethman, 1992), for example in function of annual rainfall and the presence of a prolonged dry season of the area of origin (Hacker & Ratcliff, 1989). However, the link between variation in adaptive traits and the environmental variables to which C. ciliaris should adapt is rarely well established.…”

Section: Eco-geographical Variationmentioning

confidence: 99%

“…Although there are rainfall differences within South Tunisia, these might still be too similar to cause ecotypic differentiation. By contrast, Hacker & Ratcliff (1989) compared introductions from widely separated regions of sub-Saharan Africa with different combinations of temperature and rainfall regimes to establish ecotypes of C. ciliaris. In addition, present South Tunisian populations are reduced to remnants patchily concentrated in scarce 'refuges' of the landscape (Noy-Meir, 1996).…”

Section: Eco-geographical Variationmentioning

confidence: 99%

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Seed and spike traits from remnant populations of Cenchrus ciliaris L. in South Tunisia: high distinctiveness, no ecotypes

Mseddi

Visser

Neffati

et al. 2002

Journal of Arid Environments

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In South Tunisia, as part of a native seed production program, a collection of 52 accessions of Cenchrus ciliaris was assessed for 12 different traits related to seed and spike. Possible relations between these, eco-geographic origin, and 4 adaptive traits of agronomical value were investigated. We could not establish reliable correlations between traits, nor between traits and eco-geographic origin. However, accessions were very distinct and homogeneous. Our data suggest that native seed production can consider South Tunisia as a single source and target region, but should define sound criteria to select a limited number of accessions for multiplication.2002 Elsevier Science Ltd.

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Section: Cenchrus Ciliaris In North Africamentioning

confidence: 99%

Section: Eco-geographical Variationmentioning

confidence: 99%

Section: Eco-geographical Variationmentioning

confidence: 99%

See 1 more Smart Citation

Seed and spike traits from remnant populations of Cenchrus ciliaris L. in South Tunisia: high distinctiveness, no ecotypes

Mseddi

Visser

Neffati

et al. 2002

Journal of Arid Environments

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“…Thatch moderates temperatures of underlying soil in comparison with bare soil. Hacker and Radcliff (1989) found that high fluctuations of temperature and higher temperatures generally lead to increased buffelgrass germination. Lower daytime soil temperatures resulting from shading and insulation by thatch could explain higher germination in our bare plots than in our thatched plots.…”

Section: Discussionmentioning

confidence: 99%

Uprooted buffelgrass thatch reduces buffelgrass seedling establishment

Jernigan

McClaran

Biedenbender

et al. 2016

Arid Land Research and Management

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Buffelgrass (Pennisetum ciliare (L.) Link), a non-native perennial bunchgrass, invades ecologically intact areas of the Sonoran Desert. It competitively excludes native plants and increases fire frequency and intensity. Since the 1990s, whole buffelgrass plants have been manually uprooted and removed to control the invasion in southern Arizona. Uprooting plants results in bare, disturbed soil which promotes buffelgrass seed germination. This study examined whether leaving entire uprooted buffelgrass plants (thatch) on a field site reduces future buffelgrass establishment compared to removing uprooted plants from the site. A secondary goal was to determine whether light reduction and autoallelopathy were major factors in the negative effect of thatch on buffelgrass seedling density. Field plots with an average of 8,095 kg/ha thatch had 1.9 buffelgrass seedlings/m 2 which was significantly fewer than the 2.9 seedlings/m 2 in plots without thatch. Thatched portions of thatch plots (50% of their total area) had only 0.7 seedlings/m 2 . In the greenhouse, which reduced outdoor light intensity by 35.2%, buffelgrass seeds sown in bare soil resulted in significantly higher seedling density than beneath buffelgrass thatch. Potential autoallelopathic chemicals leached from partially decomposed buffelgrass thatch and leached thatch had an intermediate but not significant (p ¼ 0.09) effect on seedling numbers. Results suggest that leaving uprooted buffelgrass plants has the benefit of reducing seedling establishment in the area disturbed by uprooting. ARTICLE HISTORY

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“…Evans and Dennehy (2005) cite Hacker and Ratcliff (1989), Ehrman and Cocks (1996), and Shem-Tov et al (2002) as finding mixed results, and Jain (1982), Gutterman and Edine (1988), and Platenkamp (1991) as finding results contrary to the predicted positive correlation between variance in reproductive success and dormancy. In addition, Silvertown (1989) used data on annual variation in survival and fecundity to predict whether any degree of dormancy should be present in 11 annual grassland species, correctly classifying eight of them.…”

Section: Introductionmentioning

confidence: 90%

Competition for space can drive the evolution of dormancy in a temporally invariant environment

Satterthwaite

2009

Plant Ecol

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I present a model for the evolution of a seed bank in the absence of externally driven environmental variation. I use Evolutionarily Stable Strategy (ESS) analyses of both analytic and simulation models to assess the conditions under which a dormant genotype can invade and resist invasion. In my models, plant seeds compete through lottery for discrete safe sites holding one individual each. Analyzing the conditions under which a dormant genotype can invade when rare and resist invasion once established, I conclude that dormancy can be an ESS when some fraction of seeds is retained locally, seed bank survival is high, and mortality in the seed bank is low. The advantage of dormancy stems from the ability of dormant seeds to recapture a lost site and the fact that a plant's offspring are more likely to win the lottery in its own site than in any new site. The advantage of dormancy does not depend on individual fecundity or on low relatedness with the offspring of kin, making this mechanism distinct from earlier models of sib competition.

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Seed Dormancy and Factors Controlling Dormancy Breakdown in Buffel Grass Accession from Contrasting Provenances

Cited by 52 publications

References 5 publications

Seed and spike traits from remnant populations of Cenchrus ciliaris L. in South Tunisia: high distinctiveness, no ecotypes

Seed and spike traits from remnant populations of Cenchrus ciliaris L. in South Tunisia: high distinctiveness, no ecotypes

Uprooted buffelgrass thatch reduces buffelgrass seedling establishment

Competition for space can drive the evolution of dormancy in a temporally invariant environment

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