7个暖季型草坪草品种对低温胁迫的抗性差异研究

Resistance to Low Temperature of 7 Warm-season Turfgrass Varieties

本研究以假俭草(Eremochloa ophiuroides)、海滨雀稗(Paspalum vaginatum)、结缕草(Zoysia japonica)、‘天堂草419’(Cynodon dactylon‘Tiffgreen 419’)和普通狗牙根(Cynodon dactylon)等5种暖季型草坪草种的7个品种为供试材料,研究了在25℃(CK)和15℃,10℃,5℃3个低温胁迫下的生理生化特征。结果表明:7个品种在低温胁迫下坪用性状指标不同程度下降,随胁迫温度的降低,草坪草叶片中丙二醛、游离脯氨酸、可溶性糖含量和相对电导率上升,叶绿素含量快速减少;海滨雀稗在5℃低温胁迫3 d枯黄,沟叶结缕草在5 d枯黄。综合7种暖季型草坪草品种的生长表现与生理指标,其抗寒性由强到弱依次为普通狗牙根>‘天堂草419’>中国假俭草>‘兰引三号’结缕草>中华结缕草>沟叶结缕草>海滨雀稗。

Physiological and biochemical characteristics of 7 warm-season turfgrass varieties,including Eremochloa ophiuroides(Munro.)Hacd.,Paspalum vaginatum Swartz seashore paspalum,Zoysia matrella(L.)Merr.,Cynodon dactylon(Linn.)Pers,Cynodon dactylon‘Tiffgreen 419’,Zoysia japonica‘Lanyin NO.3’,and Zoysia sinica Hance,under low temperature stress of 25(CK),15,10 and 5℃were studied to screen warm-season turf grass which is suitable for the southern transition zone.The results showed that the lawn traits,physiological and biochemical indicators of all turfgrass cultivars were changed under different degrees of low temperature stress.The soluble sugar content,MDA content,and proline content in the leaves and leaf electric conductivity increased with temperature reduction.While chlorophyll contents were reduced.Zoysia matrella(L.)Merr.and Paspalum vaginatum Swartz seashore paspalum were withered in 3 days and 5 days under low temperature stress of 5℃.According to the comprehensive balance analysis results of various indicators,the low temperature resistance of 7 warm-season turfgrasses is Cynodon dactylon(Linn.)Pers>Cynodon dactylon‘Tiffgreen 419’>Eremochloa ophiuroides(Munro.)Hacd.>Zoysia japonica‘Lanyin NO.3’>Zoysia sinica Hance>Zoysia matrella(L.)Merr.>Paspalum vaginatum Swartz seashore paspalum.