Flowering induction in the bioenergy grass Miscanthus sacchariflorus is a quantitative short-day response, whilst delayed flowering under long days increases biomass accumulation.
Flowering induction in the bioenergy grass Miscanthus sacchariflorus is a quantitative short-day response, whilst delayed flowering under long days increases biomass accumulation.
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DOI：
10.1093/jxb/ers346
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发表时间：
2013-01
影响因子：
6.9
通讯作者：
Clifton-Brown J
中科院分区：
文献类型：
--
作者：
Jensen E;Robson P;Norris J;Cookson A;Farrar K;Donnison I;Clifton-Brown J
芒草是一种生长迅速的C4多年生禾草，可以与芒草自然杂交。中华绒螯蟹产生种间杂种，如不育的三倍体M.创造这种杂交种对于这种新型生物能源作物的快速驯化至关重要。然而，这一研究进展一直受到环境因素的阻碍，这些因素促进了M. sacchariflorus，其开花比M. sinensis。本工作的目的是确定开花的要求M。为了加快引入针对不同环境优化的新种质，六米在受控的光周期和温度条件下生长从一系列纬度收集的糖花属（sacchariflorus）种质，并采集开花、生物量和形态表型数据。结果表明，M.无论起源如何，sacchariflorus都是数量上短日照的植物。开花静态长日（15.3小时），与较短的光周期相比，平均延迟61天，平均相关的增加52%的地上生物量（DM植物-1）。花的发生时间在光周期14.2 ~ 12.1h之间，积温高于基温10 ℃ 553-1157 ℃。芒sacchariflorus开花物候密切类似的Sorcantus和pesticum，表明潜在的相似的开花途径，并建议确定潜在的遗传机制将促进这些重要的C4草之间存在的同线关系。
Miscanthus sacchariflorus is a fast-growing C4 perennial grass that can naturally hybridize with M. sinensis to produce interspecific hybrids, such as the sterile triploid M.× giganteus. The creation of such hybrids is essential for the rapid domestication of this novel bioenergy crop. However, progress has been hindered by poor understanding of the environmental cues promoting floral transition in M. sacchariflorus, which flowers less readily than M. sinensis. The purpose of this work was to identify the flowering requirements of M. sacchariflorus genotypes in order to expedite the introduction of new germplasm optimized to different environments. Six M. sacchariflorus accessions collected from a range of latitudes were grown under controlled photoperiod and temperature conditions, and flowering, biomass, and morphological phenotypic data were captured. Results indicated that M. sacchariflorus, irrespective of origin, is a quantitative short-day plant. Flowering under static long days (15.3h daylength), compared with shorter photoperiods, was delayed by an average 61 d, with an average associated increase of 52% of above-ground biomass (DM plant–1). Timing of floral initiation occurred between photoperiods of 14.2h and 12.1h, and accumulated temperatures of 553–1157 °C above a base temperature of 10 °C. Miscanthus sacchariflorus flowering phenology closely resembles that of Sorghum and Saccharum, indicating potentially similar floral pathways and suggesting that determination of the underlying genetic mechanisms will be facilitated by the syntenic relationships existing between these important C4 grasses.
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影响因子：
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