Cryopreservation of Anigozanthos viridis ssp. viridis and related taxa from the south-west of Western Australia

2000 ◽  
Vol 48 (6) ◽  
pp. 739 ◽  
Author(s):  
S. R. Turner ◽  
D. H. Touchell ◽  
K. W. Dixon ◽  
B. Tan
Keyword(s):  
Plant Species ◽  
Western Australia ◽  
Plant Tissue ◽  
The South ◽  
Shoot Apices ◽  
Australian Plant ◽  
South West ◽  
Culture Stage ◽  
Low Levels ◽  
Cryoprotective Solution

Cryostorage of shoot apices of the perennial monocotyledonous species Anigozanthos viridis Endl. ssp. viridis (Haemodoraceae) was investigated by using a modified vitrification protocol. The highest post-thaw survival of shoot apices (41.4%) involved preculturing shoot apices on 0.4 M sorbitol for 48 h followed by incubation in a vitrification cryoprotective solution (PVS2) for 25 min at 0˚C. The level and type of cytokinin used in the culture stage was also found to influence cryostorage success with post-thaw survival decreasing from 41% with zero to low levels of cytokinins to below 5% for cytokinin levels that are typical of plant tissue applications (2.5 ˜M) for Australian plant species. Five Haemodoraceae taxa (Anigozanthos Labill. spp. and Conostylis R.Br. spp.) were successfully cryopreserved with this modified protocol; however, a sixth taxon, Macropidia fuliginosa (Hook.) Druce., remained unresponsive to this vitrification technique.

Phytophthora cinnamomi invasion, a major threatening process to conservation of flora diversity in the South-west Botanical Province of Western Australia

2007 ◽  
Vol 55 (3) ◽  
pp. 225 ◽  
Author(s):  
B. L. Shearer ◽  
C. E. Crane ◽  
S. Barrett ◽  
A. Cochrane
Keyword(s):  
Plant Species ◽  
Plant Communities ◽  
Western Australia ◽  
Phytophthora Cinnamomi ◽  
Ex Situ ◽  
Effective Control ◽  
Susceptible Plant ◽  
The South ◽  
South West ◽  
Indirect Impacts

The invasive soilborne plant pathogen Phytophthora cinnamomi Rands is a major threatening process in the South-west Botanical Province of Western Australia, an internationally recognised biodiversity hotspot. Comparatively recent introduction of P. cinnamomi into native plant communities of the South-west Botanical Province of Western Australia since the early 1900s has caused great irreversible damage and altered successional change to a wide range of unique, diverse and mainly susceptible plant communities. The cost of P. cinnamomi infestation to community values is illustrated by examination of direct (mortality curves, changes in vegetation cover) and indirect impacts on biodiversity and ecosystem dynamics, the proportion of Threatened Ecological Communities infested, Declared Rare Flora either directly or indirectly threatened by infestation and estimates of the proportion of the native flora of the South-west Botanical Province susceptible to the pathogen. While direct impacts of P. cinnamomi have been poorly documented in the South-west Botanical Province, even less attention has been given to indirect impact where destruction of the habitat by the pathogen affects taxa not directly affected by infection. Current poor understanding and quantification of indirect impacts of P. cinnamomi through habitat destruction results in an underestimation of the true impact of the pathogen on the flora of the South-west Botanical Province. Considerable variation of susceptibility to P. cinnamomi among and within families of threatened flora and responses of taxa within the genus Lambertia show how classification within family and genus are poor predictors of species susceptibility. Within apparently susceptible plant species, individuals are resistant to P. cinnamomi infection. Intra-specific variation in susceptibility can be utilised in the long-term management of threatened flora populations and needs to be a high research priority. Current control strategies for conservation of flora threatened by P. cinnamomi integrate hygiene and ex situ conservation with disease control using fungicide. Application of the fungicide phosphite has proven effective in slowing progress of P. cinnamomi in infested, threatened communities. However, variation in plant species responses to phosphite application is a major factor influencing effective control of P. cinnamomi in native communities. A greater understanding of the mechanisms of action of phosphite in plant species showing different responses to the fungicide may provide options for prescription modification to increase phosphite effectiveness in a range of plant species. The range of responses to P. cinnamomi infection and phosphite application described for Lambertia taxa suggests that the genus would make an ideal model system to elucidate the mechanisms of resistance to P. cinnamomi and the effectiveness of phosphite against the pathogen.

Accumulation and dissipation of dieldrin in mature wethers in the south-west of Western Australia

1995 ◽  
Vol 35 (3) ◽  
pp. 331 ◽  
Author(s):  
TO Albertsen ◽  
RH Casey ◽  
KP Croker
Keyword(s):  
Western Australia ◽  
Dry Matter ◽  
The Body ◽  
Contaminated Sites ◽  
The South ◽  
Fresh Material ◽  
South West ◽  
Low Concentrations ◽  
Loam Soil ◽  
Low Levels

The concentrations of dieldrin in body and wool fats of wethers grazed on 6 dieldrin-contaminated sites in the south-west of Western Australia were monitored over 2.5 years. Soil and pasture concentrations of dieldrin, a legacy of previous horticultural activities at these sites, were also measured. The concentrations of dieldrin in the soils varied from about 0.2 to 1.7 m a g . The production of the pastures at all sites showed a typical Mediterranean pattern with peak production in spring. The quantity of dry matter available ranged from <1000 kg/ha during summer-autumn to 10000 kg/ha in spring. In some samples the concentration of dieldrin in the dried plant material was above the accepted limit of 0.01 m a g for fresh material, but there were decreases over spring because of the substantial increase in the amount of dry matter available. The concentrations of dieldrin in the body and wool fats of the wethers increased during the winter and peaked at the start of spring, with the highest mean concentrations (mg/kg) in 1989 of 0.09-1.10 in body fats and 0.07-0.63 in wool fats. During spring the concentrations decreased and were at relatively low levels at the start of summer, with mean concentrations (mg/kg) of 0.02-0.72 in body fats and 0.01-0.18 in wool fats. Detailed results from 2 sites are discussed: Carbunup, with poorly structured loam soil; and Donnybrook, with good loam soil. On paddocks contaminated with dieldrin, production of wool with low concentrations of dieldrin is possible. If sheep grazed on contaminated paddocks are to be slaughtered, they should be sold in late spring, when concentrations of organochlorines in body fat should be low, or they should be run on uncontaminated land for about 2 months before their sale for slaughter.

Survey of feral honey bee (Apis mellifera) colonies for Nosema apis in Western Australia

2007 ◽  
Vol 47 (7) ◽  
pp. 883 ◽  
Author(s):  
Rob Manning ◽  
Kate Lancaster ◽  
April Rutkay ◽  
Linda Eaton
Keyword(s):  
Apis Mellifera ◽  
Honey Bee ◽  
Western Australia ◽  
Honey Bees ◽  
Nosema Apis ◽  
The South ◽  
South West ◽  
Feral Populations ◽  
Significant Difference

The parasite, Nosema apis, was found to be widespread among feral populations of honey bees (Apis mellifera) in the south-west of Western Australia. The location, month of collection and whether the feral colony was enclosed in an object or exposed to the environment, all affected the presence and severity of infection. There was no significant difference in the probability of infection between managed and feral bees. However, when infected by N. apis, managed bees appeared to have a greater severity of the infection.

scholarly journals Our New Cathedrals: Spirituality and Old-Growth Forests in Western Australia

2006 ◽  
Vol 3 (1) ◽  
Author(s):  
David Worth
Keyword(s):  
Social Movements ◽  
Western Australia ◽  
The State ◽  
The South ◽  
Old Growth ◽  
The Past ◽  
South West ◽  
Old Growth Forests ◽  
Heated Debate ◽  
Policy Proposals

Over the past 30 years in Western Australia (WA), there has been heated debate about the future use of the remaining karri and jarrah forests in the south-west of the State. This debate revolves around policy proposals from two social movements: one wants to preserve as much of the remaining old-growth forests as possible, and an opposing movement supports a continued

scholarly journals "Payneham Vale": integrated whole farm Planning

2003 ◽  
Vol 9 (1) ◽  
pp. 65
Author(s):  
R. S. Watkins
Keyword(s):  
Western Australia ◽  
Natural Vegetation ◽  
The South ◽  
Farm Planning ◽  
South West ◽  
The 1950S ◽  
Supplementary Feed ◽  
Eucalyptus Wandoo

IN 1908, Ron's grandfather, Issac Gray, took up an uncleared block of land 15 km north of Frankland in the south-west of Western Australia (see Fig. 1, Hobbs 2003). During that time he ran a few cattle in the bush and clearing of the native woodlands of Wandoo (white gum) Eucalyptus wandoo, J arrah E. marginata and Marri (Redgum) E. calophylla was slow and tedious. Ron's parents took over the farm in 1947, and with the advent of the bulldozer, clearing of Watkin's property and surrounding district began in earnest during the 1950s. Clearing continued as fast "as money permitted", until almost the last natural vegetation was knocked down in 1978 (Fig. 1). Annual pastures with some cropping (for supplementary feed) were the main source of fodder for sheep and cattle.

A new Altivasum Hedley, 1914 (Turbinellidae, Vasinae) from the coast of southern Western Australia

The Festivus ◽  
2020 ◽  
Vol 52 (3) ◽  
pp. 212-217
Author(s):  
Merv Cooper ◽  
Stephen Maxwell
Keyword(s):  
New Species ◽  
Western Australia ◽  
The South ◽  
South West ◽  
Geographically Isolated

This paper presents a new Altivasum found off Jurien Bay, Western Australia at 60 m. This new species expands our understanding of the distribution, and in particular extends the northern range of Altivasum, in the South-west Marine Region. Altivasum pauladellaboscae n. sp. is more rhomboidal than A. hedleyi Maxwell and Dekkers, 2019, which is elongated, and has the formation of tubular spines on the shoulder of axial fold on the later whorls of the spire; these spines are not formed in A. pauladellaboscae n sp. Altivasum pauladellaboscae n sp. differs from A. profundum Dekkers and Maxwell, 2018 in having acute shoulder nodules. The South Australian, A. flindersi Verco, 1914 lacks the fibriated subsutural band found in A. pauladellaboscae n. sp. Altivasum clarksoni Maxwell and Dekkers, 2019 is geographically isolated and morphologically distinct, being more elongated and fibriated. This paper brings the number of described Altivasum species to five

The species of Alexgeorgea, a Western Australian genus of the restionaceae

1990 ◽  
Vol 3 (4) ◽  
pp. 751 ◽  
Author(s):  
BG Briggs ◽  
LAS Johnson ◽  
SL Krauss
Keyword(s):  
Western Australia ◽  
Rare Species ◽  
The South ◽  
South West ◽  
River Region ◽  
Western Australian

The three species of Alexgeorgea Carlquist are revised, including A. ganopoda L. Johnson & B. Briggs, a newly described rare species of the Mt Frankland–Bow River region of the south-west of Western Australia.

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