草业学报2025，Vol.34Issue(11)：184-194,11.DOI:10.11686/cyxb2024501
自主选育苇状羊茅新品种耐热及热后恢复能力评价
Evaluation of heat tolerance and post-heat recovery capacity of new varieties of tall fescue
摘要
Abstract
Breeding tall fescue(Festuca arundinacea)with summer high temperature-and humidity-tolerance is one of the available strategies for extending the growing season of forage grasses and meeting requirements for the sustainable development of grassland-based animal husbandry in climate transition zones of China.In this study,three new strongly-tillering forage-type tall fescue varieties,Nanmu NO.1,Nanmu NO.2,and Nanmu NO.3 independently developed through cross-breeding,were evaluated,and compared with the widely used commercial variety,Fit,as the control.Experiments were conducted in an artificial climate chamber to simulate heat stress and investigate the changes in physiological,growth and nutritional traits of each variety under environmental heat stress(38℃/33℃,day/night)and post-heat recovery conditions.The results indicated that heat stress led to an increase in electrolyte leakage(EL)and a decrease in relative leaf water content(RWC),chlorophyll(Chl)content,and net photosynthetic rate(Pn)for all varieties.However,compared with Fit,the three new varieties displayed significantly reduced EL and a smaller decrease in RWC,Chl,and Pn,indicating that the new varieties had superior heat tolerance and post-heat recovery ability than Fit.The three new varieties were characterized by high tiller and leaf numbers,low stem∶leaf ratio,good palatability,high crude protein content,and excellent quality.Among the tested varieties,Nanmu NO.2 was the best.In conclusion,the three new varieties evaluated were all found to be heat-tolerant,high-yielding,high-quality forage grasses characterized by a strong tillering capacity and leaf production.They are suitable for sowing in climatic transition zones such as Jiangsu and other similar regions.关键词
苇状羊茅/热胁迫/生理指标/营养成分/生长性状Key words
tall fescue/heat stress/physiological indicators/nutrient composition/growth trait引用本文复制引用
孙诗炫,王群森,杨志民,范宁丽,郝田,刘南清,于景金..自主选育苇状羊茅新品种耐热及热后恢复能力评价[J].草业学报,2025,34(11):184-194,11.基金项目
长三角地区四季常绿草新品种选育项目(ZA32303)和江苏省优良抗逆生态修复草坪草种质创新及应用[JBGS(2021)096]项目资助. （ZA32303）
