One of the biggest challenges the turfgrass industry is currently facing is limitations of available water for irrigation of turfgrass areas. Efforts on breeding for drought resistance have increased over the past several years across the United States. Thus, the objectives of this study were to evaluate the performance of bermudagrass (Cynodon spp. Rich.), St. Augustinegrass (Stenotaphrum secundatum (Walter) Kuntze), seashore paspalum (Paspalum vaginatum Swartz) and zoysiagrass (Zoysia spp. Willd.) breeding lines from five different breeding programs under drought and estimate genetic parameters in order to increase selection efficiency for drought resistance improvement in these breeding programs. The germplasm sources were bermudagrass from Oklahoma State University and University of Georgia (UGA); St. Augustinegrass from North Carolina State University, Texas A&M University System (TAMUS) and University of Florida (UF); zoysiagrass from UF and TAMUS; seashore paspalum from UGA. Field trials were conducted from 2016 to 2019 at research facilities in Citra, FL and Dallas, TX. The response variables evaluated were per cent living ground cover (%GC), and turfgrass quality under normal or non-drought (TQND) and drought conditions (TQD). The genetic variance was significant for TQND and TQD in bermudagrass, TQD in St. Augustinegrass and all traits in zoysiagrass. The heritability estimates were higher for TQD than for TQND in bermudagrass and St. Augustinegrass. Genetic correlation estimates showed that indirect selection can be effective to select drought-resistant genotypes. Several genotypes performed better than all commercial cultivars in both St. Augustinegrass and zoysiagrass.

中文翻译：

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干旱条件下暖季草坪草品种基因型与环境的相互作用对草坪草质量的影响

草坪草行业目前面临的最大挑战之一是草坪区域灌溉用水的限制。过去几年，美国各地加大了抗旱育种的力度。因此，本研究的目的是评估狗牙根 ( Cynodon spp. Rich.)、圣奥古斯丁草 ( Stenotaphrum secundatum (Walter) Kuntze)、海滨雀稗 ( Paspalum vaginatum Swartz) 和结缕草 ( Zoysia spp. Willd.)的性能干旱条件下五个不同育种项目的育种系，并估计遗传参数，以提高这些育种项目中抗旱性改善的选择效率。种质来源为来自俄克拉荷马州立大学和佐治亚大学（UGA）的狗牙根；来自北卡罗来纳州立大学、德克萨斯农工大学系统 (TAMUS) 和佛罗里达大学 (UF) 的 St. Augustinegrass；来自 UF 和 TAMUS 的结缕草；来自佐治亚州的海滨雀稗。2016 年至 2019 年在佛罗里达州 Citra 和德克萨斯州达拉斯的研究机构进行了现场试验。评估的响应变量是正常或非干旱条件下（TQND）和干旱条件下（TQD）的活地面覆盖百分比（％GC）和草坪草质量。狗牙根的 TQND 和 TQD、圣奥古斯丁草的 TQD 以及结缕草的所有性状的遗传变异均显着。在狗牙根草和圣奥古斯丁草中，TQD 的遗传力估计值高于 TQND。遗传相关性估计表明间接选择可以有效地选择抗旱基因型。在圣奥古斯丁草和结缕草中，一些基因型的表现优于所有商业品种。