中国草地学报2026，Vol.48Issue(2)：45-54,10.DOI:10.16742/j.zgcdxb.20250278
猫尾草新品系幼苗对低温胁迫的响应
Responses of Seedlings of a New Phleum pratense Lines to Low Temperature Stress
摘要
Abstract
This study investigated the responses of three newly developed timothy(Phleum pratense)lines(P1,P2,and P3),three introduced cultivars(7019,8735,10027),and two local cultivars('Minshan'and'Chuanxi')to low temperature stress.Seedlings were subjected to 4℃,0℃,and-4℃for seven days,after which morphological,photosynthetic characteristics,and physiological parameters were measured to elucidate the mechanisms underlying cold tolerance.The results showed that decreasing temperature signifi-cantly reduced plant height,leaf morphology parameters(length,width,and area),relative water content,catalase activity,chlorophyll and carotenoid contents,transpiration rate,net photosynthetic rate,and sto-matal conductance.In contrast,malondialdehyde,proline,soluble sugar,and soluble protein contents increased markedly under low temperature stress.Superoxide dismutase and peroxidase activities displayed a biphasic pattern,reaching maximum values at 0℃and declining at lower temperatures.Intercellular car-bon dioxide concentration first decreased and then increased,with the lowest value observed at-4℃.Com-prehensive evaluation indicated that P2 and P3 exhibited the strongest cold resistance,whereas cultivars 7019 and 10027 were the most sensitive,and the remaining cultivars showed intermediate tolerance.Lin-ear regression analysis identified proline content,net photosynthetic rate,leaf area,leaf width,catalase activity,chlorophyll content,and malondialdehyde level as key indicators for evaluating cold resistance in timothy.These findings provide a theoretical basis for the selection and breeding of cold tolerant timothy cultivars.关键词
猫尾草/低温胁迫/生理特性/光合特性/综合评价Key words
Timothy/Low temperature stress/Physiological characteristics/Photosynthetic character-istics/Comprehensive evaluation分类
农业科技引用本文复制引用
何圆圆,姚宇恒,杜亮亮,効嫣,成尉滋,南丽丽..猫尾草新品系幼苗对低温胁迫的响应[J].中国草地学报,2026,48(2):45-54,10.基金项目
甘肃省重点研发计划(26YFNA026) （26YFNA026）
甘肃省重大专项(25ZDNA005) （25ZDNA005）
国家现代农业产业技术体系项目(CARS-34) （CARS-34）
