Overwintering problems of newly established Miscanthus plantations can be overcome by identifying genotypes with improved rhizome cold tolerance
Overwintering problems of newly established Miscanthus plantations can be overcome by identifying genotypes with improved rhizome cold tolerance
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DOI：
10.1046/j.1469-8137.2000.00764.x
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发表时间：
2000-11-01
期刊：
影响因子：
9.4
通讯作者：
Lewandowski, I
中科院分区：
文献类型：
--
作者：
Clifton-Brown, JC;Lewandowski, I
芒草是一种多年生根茎型C-4禾本科植物，在欧洲是一种潜在的生物质作物，主要是因为其高产潜力和低投入需求。然而，直到最近，只有一个单一的克隆，M。在欧洲各地进行的广泛田间试验中，这表明在北方欧洲的一些地方种植后的第一年越冬效果不佳。因此，田间试验的五个芒基因型，包括两个收购的芒x芒，一个M。sacchariflorus和M. 1997年初夏，在瑞典、丹麦、英国和德国四个地点种植了一批中国大豆。田间试验表明，新建立的植物在一个地点的越冬效果与大小或早衰没有明显的联系。1998年1月进行的人工冷冻试验表明，在50%的致死温度（LT_（50））下，野牡丹的死亡率最高。x martteus和M.蔗糖花基因型的最适温度为-3.4 ℃。然而，LT 50在M.在瑞典和丹麦，该基因型在田间的存活率最高。虽然根茎的碳水化合物含量，渗透势的细胞汁液和矿物成分没有被发现充分解释抗冻性的差异，水分含量与抗冻性（LT 50）在大多数情况下。所获得的结果形成的基础上，确定合适的芒属基因型的生物量生产在不同的气候地区的欧洲。
Miscanthus, a perennial rhizomatous C-4 grass, is a potential biomass crop in Europe, mainly because of its high yield potential and low demand for inputs. However, until recently only a single clone, M. x giganteus, was available for the extensive field trials performed across Europe and this showed poor overwintering in the first year after planting at some locations in Northern Europe. Therefore, field trials with five Miscanthus genotypes, including two acquisitions of Miscanthus x giganteus, one of M. sacchariflorus and two hybrids of M. sinensis were planted in early summer 1997 at four sites, in Sweden, Denmark, England and Germany. The field trials showed that better overwintering of newly established plants at a site was not apparently connected with size or early senescence. An artificial freezing test with rhizomes removed from the field in January 1998 showed that the lethal temperature at which 50% were killed (LT50) for M. x giganteus and M. sacchariflorus genotypes was -3.4 degreesC. However, LT50 in one of the M. sinensis hybrid genotypes tested was -6.5 degreesC and this genotype had the highest survival rates in the field in Sweden and Denmark. Although the carbohydrate content of rhizomes, osmotic potential of cell sap and mineral composition were not found to explain differences in frost tolerance adequately, moisture contents correlated with frost hardiness (LT50) in most cases. The results obtained form a basis for identifying suitable Miscanthus genotypes for biomass production in the differing climatic regions of Europe.