Plant & Garden News
Golden-foliaged plants
Gold particles have been found in eucalypt leaves from the Kalgoorlie region of Western Australia using x-ray elemental imaging at the Australian Synchrotron. Using this method to detect gold or other metals drawn up by the roots and deposited in the leaves (possibly as a detoxification measure) could be a way to prospect for minerals without drilling. Source: Gilding the gum tree - scientists strike gold in leaves
Megaphone leaves
A tiny Central American bat that uses furled Heliconia and Calathea leaves as a roost also uses them to amplify and transmit the bats' calls. Researchers estimate that the curled leaves act like megaphones and increase the sound by up to 10 decibels. Source: Bats Discover Surround Sound: Nature's Horn in the Midst of Jungle Helps Bats Communicate
New species of Dracaena from Thailand has horticultural potential
A new species of dragon tree has been discovered in Thailand. Occurring naturally on limestone hills and mountains, Dracaena kaweesakii reaches about 12 m in height and is extensively branched with attractive foliage. Its beauty and the association of Dracaena species with good luck has meant that it has been transplanted into local Thai gardens. Potential over-harvesting for horticulture and habitat destruction mean the species could be vulnerable in the future without suitable conservation measures. Source: A stunning new species of dragon tree discovered in Thailand
Research provides guidance for pollinator garden planning
Planting gardens to support bees and other pollinators has become popular in recent years. Recommendations are sometimes made based on anecdote and opinion, but there has been little scientific research to indicate which types of garden flowers are the most suitable. A study in the UK is one of the first. 32 summer-flowering garden plants were assessed, including 13 lavender varieties and 4 dahlias. Results showed a wide range of attractiveness among the plants tested. Open daisy-style dahlias were more successful than the pom-pom or cactus types types. Lavender varieties also varied. Marjoram attracted a wide range of insects including bees, hover flies and butterflies. Pelargonium was the least attractive of those flowers tested. Source: Flower research shows gardens can be a feast for the eyes - and the bees, Quantifying variation among garden plants in attractiveness to bees and other flower-visiting insects
Flowering of the Triassic
Drilling in Switzerland has recovered pollen that sets back the origin of flowering some 100 million years earlier than previously believed (the early Cretaceous), to the early Triassic. Source: New fossils push the origin of flowering plants back by 100 million years to the early Triassic
Hydroseeding goes organic
Mexican researchers are developing an organic hydroseeding technique to stabilise sloping roadsides that is actually better than alternatives employing artificial polymers, adhesives and fertilisers. Components of the new technique include mycorrhizae to encourage soil aggregation and an adhesive made from the nopal cactus. Source: Gardens used to reduce landslides
Nodulation - not just for legumes?
Scientists have tested various non-leguminous plants with a chemical signal from rhizobia bacteria and have observed the same inhibition of immune response that occurs in legumes. Perhaps a mechanism also exists to form nodules. If a way could be found to activate it, perhaps tomatoes or corn might one day be engineered to fix nitrogen like beans and peas. Source: First Step to Reduce Plant Need for Nitrogen Fertilizer Uncovered in Science Study
Are some crops better for urban agriculture than others?
Food production in urban areas is gaining popularity, but is not without issues. These include air quality and climate within the urban environment. A study in Chicago is comparing sites across a 40-mile gradient from downtown outwards with the same soil but varying atmospheric conditions. So far, they are finding that some crops perform better in the city and others better in the country. Identifying crops best suited to urban cultivation (and even developing varieties especially for this) will help make the improvements to productivity necessary if urban farming is going to contribute significantly to food production. Studies like this may also provide insight into the effects of climate change and pollution on crops more generally in the future. Source: Urban agriculture: The potential and challenges of producing food in cities
New family proposed for Liriodendron
Studies of a fossil plant called Archaeanthus suggest that the evolutionary line producing Liriodendron tulipfera (tulip tree) diverged from the magnolias more than 100 million years ago and that they should be placed in their own family, the Liriodendraceae. Source: Researchers identify ancient ancestor of tulip tree line
SEQld rainforest species get DNA identities
Scientists have "barcoded" hundreds of Southeast Queensland rainforest plant species by analysing unique DNA sequences accessible via a database. This will facilitate rapid plant identification which will be useful in a wide range of applications from biodiversity research to forensic investigations. Source: Plant identity now traceable via DNA barcoding
Seeing purple
Purple sweet potatoes and other vegetables selected for high pigment content could be an increasing source of natural food colorings in the future, providing alternatives to synthetic pigments and those extracted from cochineal insects. The antioxidant properties of the vegetable colorants could also have health benefits, while the byproducts such as starch and fibre can be used in many others ways. Source: Purple sweet potatoes among 'new naturals' for food and beverage colors
Cycad seeds may favour colony development
The large fleshy seeds of cycads suggest they are adapted for dispersal by a large animal, but no large birds or mammals today are known to routinely eat them. So how have cycads survived? Based on monitoring of Macrozamia miquelii by University of Queensland researchers, a new theory proposes that cycads' tendency to occur in well separated but dense colonies in the wild is a reflection of limited seed dispersal mechanisms and that this may actually be to the cycad's advantage. Because plants are either male or female, a lone seed dispersed far from other plants would be unlikely to reproduce. Very large but now-extinct animals might have eaten and deposited several seeds at once. The need to form colonies may have prevented cycads from evolving smaller seeds better suited to dispersal by smaller modern fauna. Source: Ancient cycads found to be pre-adapted to grow in groves
Nitrogen revolution on the horizon
The nitrogen-fixing ability of legumes could be extended to other crops with the help of new technology developed in the UK. A strain of N-fixing bacteria found living in sugar cane can be made to colonise other plants. Potentially, every cell in the plant could fix N from the air. This has enormous implications for the future of agriculture and the environment. The technology has been proven in range of crop species and field trials are underway. It could be commercially available within three years. Source: World changing technology enables crops to take nitrogen from the air
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