Genetic Analysis of Putative Triploid Miscanthus Hybrids and Tetraploid M. sacchariflorus Collected from Sympatric Populations of Kushima, Japan |
| |
Authors: | Maria S Dwiyanti Arthur Rudolph Kankshita Swaminathan Aya Nishiwaki Yoshiko Shimono Shotaro Kuwabara Hiroya Matuura Marhamah Nadir Stephen Moose J Ryan Stewart Toshihiko Yamada |
| |
Institution: | 1. Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Japan 2. Energy Biosciences Institute, University of Illinois, Urbana, IL, USA 3. Department of Biology, University of Florida, Gainesville, FL, USA 4. Department of Crop Sciences, University of Illinois, Urbana, IL, USA 5. Faculty of Agriculture, Miyazaki University, Miyazaki, Japan 6. The Graduate School of Agriculture, Kyoto University, Kyoto, Japan 7. Department of Plant & Wildlife Sciences, Brigham Young University, Provo, UT, USA
|
| |
Abstract: | Miscanthus ?×giganteus, a triploid hybrid between tetraploid M. sacchariflorus and diploid M. sinensis, has considerable potential as a bioenergy crop. Currently only one genotype is widely cultivated, increasing its vulnerability to diseases during production. Finding new hybrids is important to broaden genetic resources of M. ×giganteus. Three putative triploid hybrids were discovered in a sympatric population of tetraploid M. sacchariflorus and diploid M. sinensis in Kushima, Japan. The hybrid nature of the triploids was determined by morphological analysis and sequencing the ribosomal DNA internal transcribed spacer (ITS) region. The triploids had awns on their florets, which is a common characteristic of diploid M. sinensis, and sheath hairs, which is typical of tetraploid M. sacchariflorus. All triploids showed heterozygosity in their ribosomal DNA ITS sequences. Based on these results, it is confirmed that the triploids are hybrids and novel genotypes of M. ×giganteus. Natural crossing between tetraploid M. sacchariflorus × diploid M. sinensis may also lead to the production of tetraploid hybrids. ITS analysis of tetraploid plants showed that one maternal parent of the triploid hybrids, K-Ogi-1, had heterozygous ITS, which was different than the other analyzed tetraploid, M. sacchariflorus. Thus, K-Ogi-1 was likely of hybrid origin. These tetraploid hybrids can also be utilized as parents in M. ×giganteus breeding. Since all hybrids identified in this study had tetraploid M. sacchariflorus as maternal parents, collecting and analyzing seeds from tetraploid M. sacchariflorus in sympatric areas could be an effective strategy to identify natural Miscanthus hybrids that can be used as bioenergy crops. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|