Selection of suitable ecotypes withinDigitaria erianthafor reclamation and restoration of disturbed areas in southern Africa

  title={Selection of suitable ecotypes withinDigitaria erianthafor reclamation and restoration of disturbed areas in southern Africa},
  author={J. D. Theunissen},
  journal={Journal of Arid Environments},
  • J. Theunissen
  • Published 1 March 1997
  • Biology
  • Journal of Arid Environments
Abstract The gradual decline in the ecological condition of natural pastures as a result of over-utilization and the application of insufficient management decisions, coupled with the detrimental effects of long-term drought, has left extensive areas of high potential grazing land in southern Africa in urgent need of restoration. However, due to the limited number of grasses currently available for rehabilitating and restoring the vast number of different habitats encountered, an extensive… 

Figures and Tables from this paper

Restoring depleted Tunisian drylands with native steppicspecies: where should we source the seeds?

Both facts combined do not indicate any local adaptation within the target region, and suggest instead intense genetic structuring dueto isolation by distance make it easy to cull alimited number of lines to combine considerable genetic variation with consistently superior vigour.

Evaluating the agro-morphological variation in Panicum antidotale in Cholistan desert, Pakistan.

It is documented that the immediate need of an ex situ conservation with a representation of all six groups identified with PCA, in a provenance of several areas of Cholistan desert, could still preserve the relict genetic diversity.

Biogeographical patterns of grasses (Poaceae) indigenous to South Africa, Lesotho and Eswatini

The ecological and economical importance of African grasses in sustaining animal production prompted studies to quantify the wealth of grass genetic resources indigenous to southern Africa. Plant

Intraspecific diversity: adaptive differentiation of Picea mongolica W. D. Xu ecotypes

The results show that cone size is clearly not uniform among different ecotypes; the largest cones are found in the Fv ecotype and the smallest in Fp, and the zymograms of peroxidase and lipase prove the existence of different ecotype in P. mongolica.

Morphological Diversity in Germplasm of Panicum antidotale Retz

Three accessions SH2/1, KWTI/1 and SH1/1 showed high variation and appeared as the best genotypes based on morpho-anatomical characters examined in this study, which may be propagated for the restoration of degraded rangelands of Cholistan.

Fitness among population sources of a dominant species (Andropogon gerardii Vitman) used in prairie restoration1

This study sought to determine variation in fitness of population sources of Andropogon gerardii, a dominant grassland species, when grown in a mesic common garden and found no evidence of a ‘home-site advantage’ for populations originating from southern Illinois.

Response of Green Beans (Phaseolus vulgaris L.) to Salt Stress

The gradual progress of desertification due to the detrimental effects of natural stress factors such as low precipitation, long-term drought, heat, and erosion coupled with improper human activities

Yellowing of disease? Or differentiating for adaptation? Study on Cinnamomum camphora ecotypes

Results show that C. camphora might evolve adaptive differentiation in some aspects which can be used in virescence in urban streets and gardens.

Variabilidad germinativa en semillas de diferentes poblaciones de cuatro especies de gramíneas nativas de Patagonia: Un estudio de caso en el noroeste de Chubut.

It is suggested for future breeding programs with these native species it would be necessary to analyze a greater number of populations to select potential seed banks and to discuss primarily the results obtained from P. ligularis, the species that presented the highest inter-populational variability.



Phenolic compounds in the leaves of ecotypes of three graminoides in the semi-arid grasslands of southern Africa

Results obtained clearly indicate that ecotypes of these species exhibit a significant degree of variation with regard to percentage PCC and total phenolics, which will assist rangeland ecologists in identifying functional ecotypes within grass species, thus facilitating the understanding and interpretation of vegetation dynamic models and rangelands condition assessments.

Influence of habitat differences on the ecological grouping of grass species on a grazing gradient

The ecological grouping (Decreaser and Increaser groups) of individual species was determined on two topographical units in the Highland Sourveld of the Orange Free State with special attention to fence‐line comparisons, vegetation at different distances from watering points and ungrazed vegetation.

Habitat preferences of twenty‐seven grasses

Abstract A statistical analysis of species/habitat data from 521 sites in the Orange Free State is presented with a view to establishing relationships for use in aerial photograph interpretation.

Variation in important pasture grasses. II. Cytogenetic and reproductive variation.

The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all


A B S T R A C T The simple, efficient method described here for the study of ovule and megagametophyte development in angiosperms provides for the extension of investigation beyond the limits imposed

Permanent odd polyploidy in a grass (Andropogon ternatus)

The results of interspecific crosses with a taxonomically related diploid species (A. selloanus) as well as the study of pollen grain development suggest that the grains carrying nuclei with 20 chromosomes (geno...

Studies on Digitaria (Poaceae) I. Enumeration of species and synonymy

  • P. Kok
  • Biology, Environmental Science
  • 1984

An ecosystematic investigation of two graminoids (Digitaria eriantha and Setaria sphacelata var

  • torta) in the semi-arid grasslands of southern Africa. Botanical Bulletin of Academia Sinica, 33: 123–132.
  • 1992