Seed structure and germination of Dichrostachys cinerea

Bell, W. E.; Staden, J. Van

doi:10.1016/s0254-6299(16)30768-2

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…cinerea exists and therefore any knowledge of the biology of this plant should increase the success of control programmes . Removal of the seed coat, which acts as a barrier to water, did not result in 100 per cent germination [2] .…”

Section: Introductionmentioning

confidence: 88%

“…cinerea seeds is achieved by altering the structure of the testa, hilum, lens and micropyle although the lens has been shown to be the site of permeability in D . cinerea [2], Aspalathus linearis [8] and Sesbania punicea [11] seeds .…”

Section: 1 Seed Bank Statusmentioning

confidence: 99%

“…cinerea improved with storage, scarification and exposure to light [2] . It is of interest to establish how this scarification (breakdown of the seed coat), is achieved under natural conditions and whether particular environ- savanna veld .…”

Section: Introductionmentioning

confidence: 95%

“…This includes the lens which is the primary site of water entry in D . cinerea [2] . Scanning electron microscopy of an unscarified, untreated seed showed the testa surface to be devoid of cracks, the lens to be sunken and the micropyle and hilum to be surrounded by slightly raised macrosclereid cells (Fig .…”

mentioning

confidence: 99%

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The role of natural agents in the removal of coat-imposed dormancy in Dichrostachys cinerea (L.) Wight et Arn. seeds

1994

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AbstractsDichrostachys cinerea seeds are impermeable to water and do not germinate readily . The plant, however, contributes to a bush encroachment problem, minimising visibility in wildlife reserves and reducing the area available for grazing . Natural dormancy-breaking conditions must therefore exist, promoting the germinability of these normally dormant seeds . Diurnal temperature fluctuations (50'C/15°C), especially when combined with moisture were found to break dormancy . High temperatures, such as those generated by fire, destroyed seeds . Seeds ingested by herbivorous browsers such as nyala, became permeable . Seed burial for 48 weeks, was a more effective treatment than storage in promoting permeability . Distribution of D . cinerea will therefore be restricted to areas in which these conditions or factors occur . Seeds germinated optimally at 30'C in the laboratory . 51

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Section: Introductionmentioning

confidence: 88%

Section: 1 Seed Bank Statusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

mentioning

confidence: 99%

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The role of natural agents in the removal of coat-imposed dormancy in Dichrostachys cinerea (L.) Wight et Arn. seeds

1994

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“…In contrast to more mesic savannas with an annual rainfall exceeding 600 mm (Higgins et al, 2000;Roques et al, 2001;Skowno et al, 1999), the semiarid Highland savanna rarely has sufficient fuel for a fire that might control A. mellifera gullivers and they might escape the fire-sensitive stage more easily. A gulliver is a small, suppressed woody individual (Bond and Van Wilgen, 1996). The absence of grass may allow A. mellifera saplings to grow rapidly beyond the fire-sensitive stage (Skarpe, 1990).…”

Section: State 3: Unstable Grassy State With Woody Seedlingsmentioning

confidence: 99%

A conceptual model of vegetation dynamics in the semiarid Highland savanna of Namibia, with particular reference to bush thickening by Acacia mellifera

Joubert

Rothauge

Smit

2008

Journal of Arid Environments

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Seed coat structure and dormancy

1992

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An understanding of dormancy mechanisms is of ecological and economic importance. Identification of the level at which dormancy is imposed appears to be species specific. The variation brought about by this therefore requires that developmental studies be included in seed coat dormancy experiments. In most cases, a site of permeability can be identified during the developmental process, and this information can be utilized later to remove dormancy. Under natural conditions, the removal of seed coat dormancy requires the interaction of a number of ecological and physiological dormancy-breaking cues.

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Seed structure and germination of Dichrostachys cinerea

Cited by 17 publications

References 5 publications

The role of natural agents in the removal of coat-imposed dormancy in Dichrostachys cinerea (L.) Wight et Arn. seeds

The role of natural agents in the removal of coat-imposed dormancy in Dichrostachys cinerea (L.) Wight et Arn. seeds

A conceptual model of vegetation dynamics in the semiarid Highland savanna of Namibia, with particular reference to bush thickening by Acacia mellifera

Seed coat structure and dormancy

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