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首页> 外文期刊>American journal of botany >DISCOVERY OF NATURAL MISCANTHUS (POACEAE) TRIPLOID PLANTS IN SYMPATRIC POPULATIONS OF MISCANTHUS SACCHARIFLORUS AND MISCANTHUS SINENSIS IN SOUTHERN JAPAN
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DISCOVERY OF NATURAL MISCANTHUS (POACEAE) TRIPLOID PLANTS IN SYMPATRIC POPULATIONS OF MISCANTHUS SACCHARIFLORUS AND MISCANTHUS SINENSIS IN SOUTHERN JAPAN

机译：日本南部米加斯卡弗鲁虫和米加斯加虫的有症状种群中天然米加斯（禾本科）三倍体植物的发现

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Premise of the study : Looming petroleum shortages and projected negative impacts of human-induced climate change may be partly alleviated by the development and use of bioenergy feedstock crops. Miscanthus x giganteus, a highly productive sterile triploid hybrid grass that was discovered in Japan several decades ago, has considerable potential as an alternative source of energy. Given the risks, however, involved in the reliance upon production of one clone of this hybrid, which is a natural cross between Miscanthus sacchariflorus and Miscanthus sinensis, for lignocellulosic bioenergy production, natural occurrences of triploidy were investigated in sympatric populations of tetraploid M. sacchariflorus and diploid M. sinensis in Japan.Methods : Seeds were counted and DNA content was estimated by flow cytometry for plants of M. sacchariflorus and M. sinensis in several sympatric populations throughout Japan. Chromosomes were also counted for select plants.Key results : Based on seed-set data, M. sacchariflorus has significantly lower seed set than M. sinensis in Japan. Putative triploid seeds were found on M. sacchariflorus plants in southern Japan.Conclusions : This is the first report of the natural occurrence of Miscanthus triploid plants in several decades. If found to be sterile and similar in productivity to the commonly cultivated clone of M. x giganteus, these triploid plants might serve as additional sources of genetic variation for bioenergy production. Seed set data also indicates that other triploid plants might be found in more northern regions of Japan.
机译：研究的前提：日益严重的石油短缺和预计的人为气候变化带来的负面影响可能会通过生物能源原料作物的开发和使用而得到部分缓解。几十年前在日本发现的高产无菌三倍体杂种草芒草（Miscanthus x giganteus）作为替代能源具有巨大的潜力。但是，考虑到存在依赖于该杂种的一个克隆的生产的风险，该杂种是蔗糖芒草和芒草之间的天然杂交体，用于木质纤维素生物能源的生产，因此在四倍体M. sacchariflorus的同胞种群中研究了三倍体的自然发生。方法：通过流式细胞术对日本数个同居种群的糖精和中华绒螯蟹的种子进行计数，并通过流式细胞术估算其DNA含量。关键结果：根据种子定型数据，日本酿酒酵母的种子定型明显低于中华绒螯蟹。在日本南部的酿酒酵母（M. sacchariflorus）植物上发现了假定的三倍体种子。结论：这是几十年来三芒草三倍体植物自然发生的第一个报道。如果发现三倍体植物是无菌的，并且生产力与通常栽培的M. x giganteus克隆相似，则这些三倍体植物可能会作为生物能源生产的遗传变异的其他来源。种子集数据还表明，在日本更北部的地区可能还会发现其他三倍体植物。

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