2024-03-28T22:32:38Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/848472022-11-17T02:08:08Zhdl_2115_20070hdl_2115_157Assessment of Drought Tolerance of Miscanthus Genotypes through Dry-Down Treatment and Fixed-Soil-Moisture-Content TechniquesWeng, Tzu-Ya1000070710945Nakashima, TaikenVillanueva-Morales, AntonioStewart, J. RyanSacks, Erik J.1000070343952Yamada, Toshihikometadata only accessMiscanthus sppdrought tolerancephotosynthetic parametersbioenergy cropsautomated irrigation control615Miscanthus, a high-yielding, warm-season C-4 grass, shows promise as a potential bioenergy crop in temperate regions. However, drought may restrain productivity of most genotypes. In this study, total 29 Miscanthus genotypes of East-Asian origin were screened for drought tolerance with two methods, a dry-down treatment in two locations and a system where soil moisture content (SMC) was maintained at fixed levels using an automatic irrigation system in one location. One genotype, Miscanthus sinensis PMS-285, showed relatively high drought-tolerance capacity under moderate drought stress. Miscanthus sinensis PMS-285, aligned with the M. sinensis 'Yangtze-Qinling' genetic cluster, had relatively high principal component analysis ranking values in both two locations experiments, Hokkaido University and Brigham Young University. Genotypes derived from the 'Yangtze-Qinling' genetic cluster showed relatively greater photosynthetic performance than other genetic clusters, suggesting germplasm from this group could be a potential source of drought-tolerant plant material. Diploid genotypes showed stronger drought tolerance than tetraploid genotypes, suggesting ploidy could be an influential factor for this trait. Of the two methods, the dry-down treatment appears more suitable for selecting drought-tolerant genotypes given that it reflects water-stress conditions in the field. However, the fixed-SMC experiment may be good for understanding the physiological responses of plants to relatively constant water-stress levels.MDPI2021-12-22engjournal articleNAhttp://hdl.handle.net/2115/84847https://doi.org/10.3390/agriculture120100062077-0472Agriculture1216