Vegetative reproduction and root anatomy of Solanum centrale J.M.Black (Australian bush tomato)

2019 ◽  
Vol 41 (4) ◽  
pp. 345
Author(s):  
A. L. Pattison ◽  
L. W. Burgess ◽  
T. L. Bell ◽  
M. H. Ryder
Keyword(s):  
Aboriginal People ◽  
Lateral Roots ◽  
Vegetative Reproduction ◽  
South Australia ◽  
Soil Surface ◽  
Root Anatomy ◽  
Underground Structures ◽  
Mechanisms Of Formation ◽  
Root Suckering ◽  
And Function

The aim of this study was to describe the morphology, anatomy and function of underground structures associated with colonies of Solanum centrale J.M.Black (Australian bush tomato), a perennial sub-shrub found in arid areas of Australia and an important traditional staple food for Aboriginal people. It is known that this species forms clonal communities, but there is little understanding of the mechanisms of formation in either natural or cultivated situations. The underground connections within seven clonal communities from Central and South Australia were documented and samples of secondary roots, thick lateral roots and stems were examined under both laboratory and glasshouse conditions. Clonal communities were observed at all sites with individual ramets arising from lateral roots (root-suckers) that ranged from 2–10 mm in diameter growing in a network 5–15 cm below the soil surface. Lateral roots have dicotyledonous root anatomy and rapidly resprout to form new clonal ramets. They also have the capacity to accumulate starch in parenchyma cells. The morphology and root-suckering ability resemble those of weedy Solanum spp. from other parts of the world, as well as species from a variety of genera adapted to arid climates. Methods to capitalise on the ability of lateral roots to form clonal ramets in cultivated situations, particularly given the difficulties in establishing crops from seed, are discussed.

scholarly journals Changes in Root Anatomy of Peanut (Arachis hypogaea L.) under Different Durations of Early Season Drought

Agronomy ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 215 ◽  
Author(s):  
Nuengsap Thangthong ◽  
Sanun Jogloy ◽  
Tasanai Punjansing ◽  
Craig K. Kvien ◽  
Thawan Kesmala ◽  
...  
Keyword(s):  
Drought Resistance ◽  
Lateral Roots ◽  
Soil Surface ◽  
Vessel Diameter ◽  
Second Order ◽  
Root Anatomy ◽  
Drought Treatment ◽  
Drought Period ◽  
Early Season ◽  
Selection Of

Changes in the anatomical structure of peanut roots due to early season drought will likely affect the water acquiring capacity of the root system. Yet, as important as these changes are likely to be in conferring drought resistance, they have not been thoroughly investigated. The objective of this study was to investigate the effects of different durations of drought on the root anatomy of peanut in response to early season drought. Plants of peanut genotype ICGV 98305 were grown in rhizoboxes with an internal dimension of 50 cm in width, 10 cm in thickness and 120 cm in height. Fourteen days after emergence, water was withheld for periods of 0, 7, 14 or 21 days. After these drought periods, the first and second order roots from 0–20 cm below soil surface were sampled for anatomical observation. The mean xylem vessel diameter of first- order lateral roots was higher than that of second- order lateral roots. Under early season drought stress root anatomy changes were more pronounced in the longer drought period treatments. Twenty-one days after imposing water stress, the drought treatment and irrigated treatment were clearly different in diameter, number and area of xylem vessels of first- and second-order lateral roots. Plants under drought conditions had a smaller diameter and area of xylem vessels than did the plants under irrigated control. The ability of plants to change root anatomy likely improves water uptake and transport and this may be an important mechanism for drought tolerance. The information will be useful for the selection of drought durations for evaluation of root anatomy related to drought resistance and the selection of key traits for drought resistance.

Aboriginal perspectives on kangaroo management in South Australia

2006 ◽  
Vol 28 (2) ◽  
pp. 127 ◽  
Author(s):  
D. A. Thomsen ◽  
K. Muir ◽  
J. Davies
Keyword(s):  
Decision Making ◽  
Research Methods ◽  
Aboriginal People ◽  
South Australia ◽  
Research Participants ◽  
Commercial Harvest ◽  
Decision Making Processes ◽  
Rights And Interests

Kangaroos are culturally significant to Aboriginal people but Aboriginal people are generally not involved in kangaroo management or in the kangaroo industry. Our research has provided the first opportunity for Aboriginal people in South Australia to present their perspectives on the commercial harvest of kangaroos. Research methods were qualitative, involving consultations with authoritative Aboriginal people about their perspectives, aspirations, and how they see their rights and interests in relation to the commercial harvest of kangaroos. We found diverse views on this topic from Aboriginal research participants. For some Aboriginal people, strict cultural protocols preclude any involvement in the commercial harvest, but for people from other regions where the cultural laws concerning kangaroos are quite different, there is interest in developing enterprises based on kangaroo harvest. Despite the diversity of views about commercial kangaroo harvest, Aboriginal people across South Australia highly value kangaroos, and want to be included in decision-making processes for kangaroo management. There is potential for appropriate engagement of Aboriginal people in kangaroo management through improved communication, greater understanding and respect for the diversity of Aboriginal perspectives and protocols regarding native wildlife.

Distribution of Biomass, Nitrogen, Phosphorus and Other Nutrients in Banksia marginata and B. ornata Shoots of Different Ages After Fire.

1986 ◽  
Vol 34 (6) ◽  
pp. 709 ◽  
Author(s):  
RH Groves ◽  
PJ Hocking ◽  
A Mcmahon
Keyword(s):  
National Park ◽  
Dry Matter ◽  
Lateral Roots ◽  
South Australia ◽  
Distribution Patterns ◽  
Nutrient Accumulation ◽  
Nitrogen And Phosphorus ◽  
Vegetative Organs ◽  
Western Victoria ◽  
Nitrogen Phosphorus

The heathland form of Banksia marginata Cav. regenerates rarely from seed but commonly by resprout- ing from buds on lateral roots, whereas Banksia ornata F. Muell. regenerates only from seed, usually released after fire. The two species co-occur in heath vegetation on nutrient-poor soils in south-eastern South Australia and western Victoria. Shoots were sampled from stands of B. marginata aged from 1 to 25 years and of B. ornata aged from 1 to 50+ years after fire in the Little Desert National Park, western Victoria. B. marginata, the resprouter, distributed a greater proportion of the total shoot dry matter and content of all nutrients to vegetative growth over its shorter life span than B. ornata, the non-sprouter. About 50% of the total phosphorus in B. ornata shoots at 50+ years was present in cones (including seeds) compared with only about 20% in B. marginata shoots at a comparable stage of senescence (25 years). This difference between the species was also true to a lesser degree for nitrogen. There were considerable differences between other nutrients in their distribution patterns in shoots. Nutrients could be grouped together on the basis of distribution in shoots more satisfactorily than on presumed physio- logical roles. Stems were major sites of nutrient accumulation in both species. The content of a particular nutrient in seeds as a proportion of the content in the living parts of the shoot ranged from 0.03% (Na, Mn) to 2.0% (P) in B. marginata, and from 0.3% (Na) to as high as 31% (P) in B. ornata. Concen- trations of all nutrients except sodium were much higher in seeds than in the woody cones or vegetative organs of both species; seeds of B. ornata were particularly rich in calcium and manganese. We conclude that the different patterns of distribution of biomass and nutrients, especially nitrogen and phosphorus, within shoots of the two species reflect their different regenerative modes after fire. Introduction Phosphorus and, to a lesser extent, nitrogen limit the growth of sclerophyllous shrubs on nutrient-poor soils in southern Australia

Aboriginal Studies at Year 12 in South Australia and Northern Territory

1989 ◽  
Vol 17 (5) ◽  
pp. 21-26
Author(s):  
Adele Pring
Keyword(s):  
Aboriginal People ◽  
South Australia ◽  
Northern Territory ◽  
Aboriginal Communities ◽  
The Media ◽  
Media Form ◽  
Senior Secondary

Aboriginal Studies is now being taught at Year 12 level in South Australian schools as an externally moderated, school assessed subject, accredited by the Senior Secondary Assessment Board of South Australia.It is a course in which students learn from Aboriginal people through their literature, their arts, their many organizations and from visiting Aboriginal communities. Current issues about Aborigines in the media form another component of the study.

The role of seed reproduction in the dynamics of established populations of Hieracium floribundum and a comparison with that of vegetative reproduction

1975 ◽  
Vol 53 (24) ◽  
pp. 3022-3031 ◽  
Author(s):  
A. G. Thomas ◽  
H. M. Dale
Keyword(s):  
Population Dynamics ◽  
Seedling Establishment ◽  
Vegetative Reproduction ◽  
Soil Surface ◽  
Growing Season ◽  
Population Based ◽  
Early Spring ◽  
Viable Seed ◽  
Density Patch

In the crowded parts of patches of Hieracium floribundum Wimm. and Grab., which were established for at least a decade in an ungrazed pasture, 7–10% of the population (3700 individuals/m2) flowered. Of the plants that flowered, 94% were alive a year later, but only 5% of these flowered. Abortion of flower heads was common; one half of all those which were initiated in early June had aborted by flowering time in early July. Freshly dispersed seed had a viability of 57%, which was reduced to 17% a year later, after its storage close to the soil surface. Less than 6% of the viable seed was innately dormant. Dry, laboratory-stored seed retained its viability for the year but was slower to germinate than soil-stored seed. In field conditions, germination was temperature inhibited during most of the growing season. Maximum daytime microsite temperatures of less than 32 °C, which is necessary for germination, were found to occur only in early spring and late fall. Successful seedling establishment accounts for 1% of the individuals in a crowded population. Based on the maximum sexual reproduction from plants in crowded populations, a seed has a probability of 1 in 20 000 of becoming an established seedling. A model of population dynamics in a high-density patch traces the fate of seedling establishment, surviving adults, and stolon-derived rosettes for a single year.

EFFECT OF SOIL CONDITIONS ON UPLIFT OF UNDERGROUND STRUCTURES IN LIQUEFIED SOIL

2012 ◽  
Vol 06 (04) ◽  
pp. 1250020 ◽  
Author(s):  
SIAU CHEN CHIAN ◽  
SANTANA PHANI GOPAL MADABHUSHI
Keyword(s):  
Shear Strength ◽  
Soil Surface ◽  
Saturated Soil ◽  
Unit Weight ◽  
Soil Conditions ◽  
Underground Structures ◽  
Lower Unit ◽  
Liquefiable Soil ◽  
Soil Deposits ◽  
Earthquake Event

In an earthquake, underground structures located in liquefiable soil deposits are susceptible to floatation following an earthquake event due to their lower unit weight relative to the surrounding saturated soil. Such uplift response of the buoyant structure is influenced by the soil it is buried in. In the case of a liquefiable soil deposit, the soil can lose its shear strength significantly in the event of an earthquake. If the soil liquefies fully, the buoyant structure can float towards the soil surface. However, a partly liquefied soil deposit retains some of its initial shear strength and resists the uplift. This paper discusses the different soil conditions and their influence on the uplift response of buoyant structures.

scholarly journals Root and shoot attributes of indigenous perennial accessions of the wild mungbean (Vigna radiata ssp. sublobata)

2006 ◽  
Vol 57 (7) ◽  
pp. 791 ◽  
Author(s):  
G. J. Rebetzke ◽  
R. J. Lawn
Keyword(s):  
Vigna Radiata ◽  
Plant Biomass ◽  
Lateral Roots ◽  
Late Summer ◽  
Soil Surface ◽  
Sowing Date ◽  
Early Summer ◽  
Seed Biomass ◽  
Total Plant Biomass ◽  
Total Plant

Root and shoot attributes of 12 indigenous perennial accessions of the wild mungbean (Vigna radiata ssp. sublobata) were evaluated in early and late summer sowings in the field in SE Queensland. All but one of the accessions were obtained from the Townsville–Charters Towers region of NE Queensland. In both sowings, the accessions developed thickened tap and lateral roots, the taproot thickening extending to a depth of 0.20–0.30 m below the soil surface, depending on accession. The thickened lateral roots emerged from the taproot within 0.10 m of the soil surface, and extended laterally up to 1.10 m, remaining close to the soil surface. Differences among the accessions in gross root morphology and phenology were relatively small. There were differences among the accessions in the production of seed, tuberised root, and recovered total plant biomass. Depending on accession and sowing date, the tuberised roots accounted for up to 31% of recovered plant biomass and among accessions, the root biomass was positively correlated with total plant biomass. In contrast, seed biomass represented only a small proportion of recovered plant biomass, up to a maximum of 14%, depending on accession and sowing date. Among accessions, the proportion of seed biomass tended to be negatively correlated with that of tuber biomass. The perennial trait appears to be unique to Australian accessions of wild mungbean obtained from coastal-subcoastal, speargrass-dominant woodlands of NE Queensland. Although the ecological significance of the trait remains conjectural, field observation indicates that it facilitates rapid plant re-growth following early summer rainfall, especially where dry-season fire has removed previous-season above-ground growth.

Shaking Table Test of Muti-Story Subway Station Considering Soil-Structure Interaction

2013 ◽  
Vol 694-697 ◽  
pp. 321-324 ◽  
Author(s):  
Shu Wei Wang ◽  
Ying Ming Zhou ◽  
Shu Yun Mi
Keyword(s):  
Seismic Waves ◽  
Shaking Table Test ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Soil Surface ◽  
Shaking Table ◽  
Subway Station ◽  
Acceleration Process ◽  
Underground Structures

In this paper, a three-dimensional shaking table test of three three-span subway station model is done. Three test seismic waves were selected in this experiment, which were applied to the model. Modal analysis of the structure was done, and the determination of the acceleration of the model structure was obtained. And the law of underground structures under earthquake damage was analysis. Soil surface acceleration process and its response spectrum and strain are obtained in the different amplitudes of ground motion input case. From experiment cracks in the emergence and development of the situation were observed, and which gives recommendations for the seismic design of underground structures.

Legislating for Land Rights in Australia

2001 ◽  
Vol 23 (1) ◽  
pp. 21-23 ◽  
Author(s):  
Nicolas Peterson
Keyword(s):  
Aboriginal People ◽  
South Australia ◽  
Land Rights ◽  
Northern Territory ◽  
Royal Commission ◽  
Land Trusts ◽  
Terra Nullius ◽  
History Of ◽  
Policy Work ◽  
The Government

A commitment in applied anthropological policy work to maximising cultural appropriateness or even to supporting what indigenous people say they want is not always possible. This proved to be the case in connection with formulating recommendations for land rights legislation in Australia's Northern Territory. Until 1992 the only rights in land that Aboriginal people had as the original occupiers of the continent were statutory (that is, through acts of state and federal parliaments). No treaties were signed with Aboriginal people and until that date the continent was treated as terra nullius, unowned, at the time of colonisation in 1788. From early on in the history of European colonisation, however, areas of land had been set aside for the use and benefit of Aboriginal people. These reserves were held by the government, or by one of a number of religious bodies that ministered to Aboriginal people, usually supported by government funding. Beginning with South Australia in 1966 all of the states, except Tasmania, have passed legislation that gives varying degrees of control of these reserves to land trusts governed by Aboriginal people. Each of these pieces of legislation had/have different shortcomings which included some or all of the following: the total area that had been reserved was small; the powers granted over the land were limited; the majority of the Aboriginal population did not benefit from the legislation; and none of them addressed the issue of self-determination. In 1973 a Royal Commission into Aboriginal Land Rights, with a single Commissioner, Mr. Justice Woodward, was established by the newly elected Federal Labor government, the first in 23 years. It was planned that it would deal with the continent but that it would begin by focusing on the Northern Territory which until 1978 was administered by the Federal government. At the time there were 25,300 Aboriginal people in the Territory making up 25% of the population.

scholarly journals Mapping Forgotten Worlds: a conversation with Danielle Clode

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Gillian Dooley
Keyword(s):  
Academic Writing ◽  
Aboriginal People ◽  
South Australia ◽  
Growing Up ◽  
Killer Whales ◽  
Her Family ◽  
Australian Aboriginal ◽  
Oxford University ◽  
Working Together ◽  
First Contact

Danielle Clode is an Adelaide-based author who has written on prehistoric megafauna, Pacific exploration, killer whales and bushfires. She writes children’s books, essays, fiction and popular zoology, which have won awards, fellowships and prizes too numerous to mention. Her latest book, at the time of writing, is The Wasp and the Orchid, a biography of Australian nature writer Edith Coleman. Danielle and I have known each other for some years, and we are currently working together on an edited book about first contact between Australian Aboriginal people and explorers. For details of her publications and career, see her website at danielleclode.com.auA graduate in zoology from Oxford University, Danielle has worked as a zookeeper and a museum researcher. Growing up on the Eyre Peninsula, South Australia, she spent some of her childhood travelling coastal Australia with her family by boat. Danielle teaches creative and academic writing and in all her work she is conscious of the importance of form and voice. In this interview I asked her about style, genre and technique in her writing, particularly The Wasp and the Orchid (2018), Voyages to the South Seas: In Search of Terres Australes (2007) and A Future in Flames (2010).We spoke at her home in the Adelaide Hills in June 2018, and I first asked her about the combination of styles in A Future in Flames, her book about the history, science and future impact of bushfires in Australia.

Sign in / Sign up

Export Citation Format

Share Document