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Effects of high temperature and drought on a hybrid bluegrass compared with Kentucky bluegrass and tall fescue

机译:与肯塔基州早熟禾和高羊茅相比,高温和干旱对杂交早熟禾的影响

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摘要

High temperature and drought stresses may reduce quality in cool-season turfgrasses during summer months in the transition zone. This growth chamber study was conducted to evaluate effects of high temperature and drought on physiology and growth of ‘Apollo’ Kentucky bluegrass (Poa pratensis L.) (KBG), ‘Dynasty’ tall fescue (Festuca arundincea Schreb.) (TF), and ‘Thermal Blue’, a hybrid (HBG) between KBG and Texas bluegrass (Poa arachnifera Torr.). Turfgrasses were exposed for 48 days to supra-optimal (high temperature; 35/25[degree]C, 14-h day/10-h night) and optimal (control; 22/15oC, 14-h day/10-h night) temperatures under well-watered (100% evapotranspiration [ET] replacement) and deficit (60% ET replacement) irrigation. Heat resistance was greater in HBG, which had greater visual quality, gross photosynthesis (P[subscript]g), dry matter production, and lower electrolyte leakage and soil-surface temperatures than KBG and TF under high temperature. Cumulative Pg during the study was 16% and 24% greater in HBG than in KBG and TF, respectively. Green leaf area index (LAI) in HBG was not affected by high temperature, but LAI was reduced by 29 % in KBG and 38% in TF. Differences in drought resistance were negligible among species. The combination of high temperature and drought caused rapid declines in visual quality and dry matter production, but HBG generally performed better. Results indicated greater heat resistance, but not drought resistance, in HBG than in KBG or TF.
机译:在过渡区夏季,高温和干旱胁迫可能会降低凉季草坪草的质量。进行了这项生长室研究,以评估高温和干旱对'Apollo'肯塔基蓝草(Poa pratensis L.)(KBG),'Dynasty'高羊茅(Festuca arundincea Schreb。)(TF)和“ Thermal Blue”,KBG和德克萨斯蓝草(Poa arachnifera Torr。)之间的杂种(HBG)。草坪被暴露于超最佳温度(高温; 35/25℃,14h白天/ 10h晚上)和最佳温度(对照; 22 / 15oC,14h白天/ 10h晚上)48天)在灌溉充足的水(100%蒸散量[ET])和亏水(60%ET更换)下的温度。与高温下的KBG和TF相比,HBG的耐热性更高,HBG具有更高的视觉质量,光合作用(Pg),干物质产生,电解质泄漏和土壤表面温度更低。在研究期间,HBG的累积Pg分别比KBG和TF高16%和24%。 HBG中的绿叶面积指数(LAI)不受高温影响,但KBG中的LAI降低了29%,TF中的LAI降低了38%。种间抗旱性的差异可以忽略不计。高温和干旱的结合导致视觉质量和干物质生产迅速下降,但HBG通常表现更好。结果表明,HBG比KBG或TF具有更高的耐热性,但没有抗旱性。

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