Switchgrass(Panicum virgatum L.), as a model herbaceous crop species for bioenergy production,is targeted to improve biomass yield and feedstock quality.Plant height is a major component contributing to biomass yield....Switchgrass(Panicum virgatum L.), as a model herbaceous crop species for bioenergy production,is targeted to improve biomass yield and feedstock quality.Plant height is a major component contributing to biomass yield. Accordingly, the objectives of this research were to analyze phenotypic variation for biomass and plant height and the association between them and to localize associated plant height QTLs. Two lowland switchgrass mapping populations, one selfed and another hybrid population established in the field at Perkins and Stillwater,Oklahoma, were deployed in the experiment for two years post establishment. Large genetic variation existed for plant biomass and height within the two populations. Plant height was positively correlated with biomass yield in the selfed population(r = 0.39, P < 0.0001) and the hybrid population(r = 0.41, P < 0.0001). In the selfed population,a joint analysis across all environments revealed 10 QTLs and separate analysis for each environment, collectively revealed 39 QTLs related to plant height. In the hybrid population, the joint analysis across overall environments revealed 35 QTLs and the separate analysis for each environment revealed 38 QTLs. The findings of this research contribute new information about the genetic control for plant height and will be useful for future plant breeding and genetic improvement programs in lowland switchgrass.展开更多
油菜免耕飞播模式对挖掘长江流域冬闲田生产潜力并实现轻简化生产具有重要意义,明确适宜稻茬留桩高度是优化该模式核心参数的关键。本研究于湖北省武穴市和黄陂区连续进行两年田间试验,2020-2021年设置0、20、40、60 cm 4个留桩高度处理...油菜免耕飞播模式对挖掘长江流域冬闲田生产潜力并实现轻简化生产具有重要意义,明确适宜稻茬留桩高度是优化该模式核心参数的关键。本研究于湖北省武穴市和黄陂区连续进行两年田间试验,2020-2021年设置0、20、40、60 cm 4个留桩高度处理,2021-2022年根据前一年试验结果设置0、10、20、30、40、50、60 cm 7个留桩高度处理,系统分析留桩高度对油菜关键生育期农艺性状指标、油菜籽产量及其构成因子的影响。结果表明,留桩高度显著调控油菜籽产量,本试验条件下最佳留桩高度为20~40 cm,油菜籽产量较0~10 cm和50~60 cm处理分别平均提高25.5%和26.6%。油菜籽产量差异源于群体密度和单株角果数的协同作用:留桩低于20 cm时,由于出苗数量下降导致成熟期密度降低23.8%,单位面积角果数降低10.4%;留桩高于40 cm时,冬前成苗率和冬后存活率均显著降低,成熟期密度降低17.6%,单株角果数随留桩升高递减,最终单位面积角果数降低28.8%。综上,免耕飞播油菜适宜的稻茬留桩高度控制在40 cm以内,可结合区域水稻生物量动态调整,实现稳产轻简目标。展开更多
基金supported by NSF EPSCoR award 0814361Oklahoma Agricultural Experiment Station, Hatch OKL2972the South Central Sun Grant Competitive Grants Program
文摘Switchgrass(Panicum virgatum L.), as a model herbaceous crop species for bioenergy production,is targeted to improve biomass yield and feedstock quality.Plant height is a major component contributing to biomass yield. Accordingly, the objectives of this research were to analyze phenotypic variation for biomass and plant height and the association between them and to localize associated plant height QTLs. Two lowland switchgrass mapping populations, one selfed and another hybrid population established in the field at Perkins and Stillwater,Oklahoma, were deployed in the experiment for two years post establishment. Large genetic variation existed for plant biomass and height within the two populations. Plant height was positively correlated with biomass yield in the selfed population(r = 0.39, P < 0.0001) and the hybrid population(r = 0.41, P < 0.0001). In the selfed population,a joint analysis across all environments revealed 10 QTLs and separate analysis for each environment, collectively revealed 39 QTLs related to plant height. In the hybrid population, the joint analysis across overall environments revealed 35 QTLs and the separate analysis for each environment revealed 38 QTLs. The findings of this research contribute new information about the genetic control for plant height and will be useful for future plant breeding and genetic improvement programs in lowland switchgrass.
