Plant Variety Journal - IP Australia

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Plant Varieties Journal Vol. 23 Number 4 Details of Application Application Number 2008/273 Variety Name ‘Riverina Heather’ Genus Species Lavandula angustifolia Common Name English Lavender Synonym Nil Accepted Date 08 Oct 2008 Applicant Charles Sturt University Agent N/A Qualified Person Nigel Urwin, Charles Sturt University, Wagga Wagga, NSW. Details of Comparative Trial Location Charles Sturt University Descriptor Lavandula (Lavandula) TG/194/1 Period Sep 2009 – Dec 2010 Conditions All plants were propagated by Larkman Nurseries, Lilydale, Melbourne, and provided in 50x75mm tubes. All plants were potted into 9cm diameter pots in Debco TM Terracotta and Tub potting mix. Plants were then watered by automatic overhead sprinklers and occasionally by hand. Osmocote TM slow release fertiliser and fungicides were applied occasionally as required. Trial Design The trial consisted of 10 plants of L. angustifolia ‘Riverina Heather’, 10 L. angustifolia ‘Bee’ and 9 L. angustifolia ‘Hicote’. Plants were arranged in a completely randomised block design (10x3). Measurements Observations were made on 29 Nov 2010 when all varieties were in flower. Plants were observed for size and form early Oct 2010. RHS Chart - edition Fifth edition. Origin and Breeding Induced mutation: The new variety ‘Riverina Heather’ came out of an experiment in which seed was germinated in the presence of colchicine to induce polyploidy. Seed was sown in petri dishes (0.2g per dish ~200 seeds) on 2 layers of Whatman number 1 filter paper. The filters were wetted with 4 ml of 0.5 mg/ml gibberellic acid (GA 3 ) potassium salt (Sigma) containing various amounts of colchicine. Two dishes were initiated per colchicine concentration. Colchicine solutions were made by ½ serial dilutions of a 1g/L stock in the GA 3 solution. Plates were sealed with parafilm and were incubated at 22°C in an incubator in 12 hours light/ 12 hours dark at 25 uE/ m 2 /s for 7 days. Plates were removed to glasshouse and acclimatised to natural lighting in shade two days prior to transfer to potting mix. Seedlings were transferred to potting mix (Debco TM ) in trays which consisted of individual cells which were 3x3 cm. Plants were sub-irrigated by standing in a shallow tray of water for 3 weeks. Trays were then placed on misting beds and plants were finally transferred in pots. Considerable variation was observed between seedlings from this seed batch, in the absence or presence of colchicine treatment. Plants varied in habit, size, flower colour (calyx and petals), peduncle length and spike length. This variation between lavenders grown from seed is recorded in the literature and is likely due to considerable crosspollination. Lavender varieties are therefore generally propagated vegetatively to maintain the phenotype. Over 100 plants were grown from the above seed batch, including ones which had been treated with colchicine and control untreated plants. From these a plant was selected on the basis that it carried a sport with very large flowers. The plant survived 0.0156 g/L colchicine and the sport was removed and vegetatively propagated. The plant grown from this sport and all subsequently propagated plants from this sport were called Riverina Heather or C6/24. The plant has the largest flowers, thickest peduncles and a Page 112 of 322
Plant Varieties Journal Vol. 23 Number 4 higher seed weight than any L. angustifolia variety of common knowledge. We have determined chromosome number in root tip cells and measured genome size by flow cytometry. ‘Riverina Heather’ is a tetraploid with approximately 100 chromosomes whereas other L. angustifolia varieties including the seed line we selected this variety from are diploid and have 50 chromosomes. Choice of Comparators Characteristics used for grouping varieties to identify the most similar Variety of Common Knowledge Organ/Plant Part Context State of Expression in Group of Varieties Corolla colour purple Time of beginning of flowering medium Varieties of Common Knowledge identified and subsequently excluded Variety Distinguishing Characteristics State of Expression in Candidate Variety State of Expression in Comparator Variety Munstead: was excluded as true Munstead could not be obtained in Australia as provenance was uncertain. Munstead is sometimes grown from seed and can variable. There are several forms of Munstead. Source: Upson, T & Andrews, S. (2004) The Genus Lavandula., Timber Press. Most Similar Varieties of Common Knowledge identified (VCK) Name ‘Bee’ ‘Hidcote’ Comments Page 113 of 322
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Plant Variety Journal - IP Australia

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