by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
TAS Country : February 10th 2011
Friday, February 11, 2011 Tasmanian Country 23 developed here shows persistence In trials at various locations in Australia located in the margins where perennial ryegrass survives, it has been demonstrated that the key to persistence of a plant is its genetics rather than endophyte. ABOVE: New Zealand bred Banquet II Perennial Ryegrass. BELOW: Australian bred Camel Perennial Ryegrass. PERENNIAL ryegrass is one of the most important grasses for Tasmanian pastures because of its fast establishment, easy management and high palatability. Farmers expect perennial ryegrass to act as a perennial and persist for several years, but some new varieties have not been persisting as expected. Research at Australian pasture grass breeding company Valley Seeds has discovered one of the major drivers of persistence. Company plant breeder Anthony Leddin explained that the reason many perennial ryegrass varieties have been lacking persistence has been due, in part, to a new practice of focusing too heavily on breeding with a fungus called endophyte as the primary aspect of the plant, rather than genetics as the primary factor. Many of these new varieties of perennial ryegrass have been bred by foreign multinational companies in milder climates than Australia's. ''Our research has found that breeding in Australia for greater levels of genetics for persistence and rigorous testing for persistence of overseas-bred varieties is the answer to producing more persistent perennial ryegrass varieties,'' he said. Mr Leddin has written a paper on breeding aspects associated with persistence in perennial ryegrass and the results show that persistence is strongly correlated to the genetics behind breeding rather than any type or content of endophyte fungus. As a result of this work, new varieties recently released in Tasmania by Valley Seeds include Platinum and Camel perennial ryegrass. He explained that in a complicated scientific debate it was important for consumers to have a full understanding of the issues that had not previously been well understood so that they could make an informed choice on what product they should purchase. ''Our new research paper brings together scientific evidence about endophyte infection in perennial ryegrass and questions if it has a positive role or indeed whether it is even needed at all in well-bred perennial ryegrass varieties,'' he said. ''In trials at various locations in Australia located in the margins where perennial ryegrass survives, it has been demonstrated that the key to persistence of a plant is its genetics rather than endophyte. ''Endophyte is a fungus that often occurs in perennial ryegrass as well as some other perennial grasses. ''The natural form of endophyte often causes the syndrome known as ryegrass staggers. ''The effects on livestock and subsequent costs to producers are significant. ''New Zealand research has attempted to select novel endophytes existing in nature to retain perceived positive affects and reduce negative affects. ''In the process of delivering extension messages about new endophyte strains and the varieties containing these new strains, some basic knowledge about the interaction with plants and varieties has not been well explained or understood.'' Mr Leddin said one of the major claims about endophyte was that endophyte was required in a variety for it to be persistent. Contrary to this, various Australian trials had demonstrated that genetics may be the major determinate of persistence rather than endophyte content or type. ''Without the support of a large number of studies of endophyte in perennial ryegrass in Australia a long bow has been drawn from overseas studies in regard to the persistence of plants containing endophyte,'' he said. ''In one Australian study on endophyte in perennial ryegrass it was shown that the persistence of plants infected with the novel endophyte AR1 was no greater than those with low endophyte [Lowe et al. 2006].'' In 2009 Mr Leddin was awarded Young Scientist of the Year for Meat and Livestock by MLA for a project to develop summer dormant perennial ryegrasses with low endophyte with the aim of persisting longer than any current variety available in Australia. For the full version of his paper on endophyte email firstname.lastname@example.org. tas global seeds NEW GENERATION COCKSFOOTS Highly palatable, non- clumping, easy to manage. Comparable with clovers. 2038848-110211 MEGATAS Medium - high rainfall Summer Active Good drought tolerance Good frost tolerance UPLANDS Medium - low rainfall Winter active High drought tolerance High frost tolerance New seasons seed available early March from most rural retail outlets. KUHN Seed Drills The VENTA LC is the latest in the range of KUHN integral seed drills. Its reduced weight, 1200 litres capacity and reduced overall dimensions make it the ideal size for medium horsepower tractors. Burnie 6431 3255 Devonport 6424 1511 Hobart 6263 6377 Launceston 6343 1633 Smithon 6452 1222 VENTA seed drills have been designed to give crops the best chances to develop in order to ensure the best result at the lowest operating costs by reducing seed input expenses, but also by increasing the efficiency of fertilizers and plant-care products. 1. A central metering unit calibrates the seed quantity, 2. This quantity is poured into an injector, where it is mixed with air delivered by the blower 3. The air-seed mixture rises up the ringed column 4. The mixture is diffused evenly in the VENTA distribution head: impeccable sowing 1 2 3 4 TASMANIA FARM EQUIPMENT PTY. LTD.
February 3rd 2011
February 17th 2011