Physiological responses to chilling of six warm-season turfgrasses

صينى. 在佛山市对低温下台湾草（Zoysia tenuifolia Willd. ex Trin.）、地毯草（Axonopus compressus （Swartz） Beauv.）、夏威夷草（Paspalum vaginatum Sw.）、假俭草（Eremochloa ophiuroides（Munro）Hack.）、结缕草（Zoysiajaponica Steud.）和钝叶草（Stenotaphrum secundatum （Walt.） Kuntze）等6个暖季型草种的生理反应进行了比较研究。田间种植的草坪草材料在受到2004年12月份的寒潮袭击后,假俭草5号未受到伤害,地毯草和兰引3号受到的伤害较严重;台湾草、兰引3号和钝叶草的光合速率大大降低,而夏威夷和假俭草5号的光合速率变化不大;地毯草和兰引3号的叶片可溶性糖含量变化不大,而其它几种暖季型草坪草的叶片可溶性糖含量升高,各草种的根系可溶性糖含量降低。结果表明,耐寒的假俭草5号在低温下光合速率受抑制较小与叶片可溶性糖含量积累较多有关,而对低温敏感草种的叶片可溶性糖积累较少。

إنجليزي. The physiological responses of six warm-season turfgrass species, Zoysia tenuifolia Willd. ex Trin. , Axonopus cornpressus （Swartz） Beauv. , Paspalurn vaginaturn Sw. , Erernochloa ophiuroides （Munro） Hack. cv. No. 5, Zoysia japonica Steud. cv. Lanyin No. 3, and Stenotaphrurn secundaturn （Walt.） Kuntze, to chilling injury were comparatively studied in field during the cold weather by the end of December, 2004. E. ophiuroides showed no injury during chilling stress, whereas A. cornpressus and Z. japonica showed seriously injury. The photosynthetic rate was decreased greatly in Z. tenuifolia, Z. japonica, and S. secundaturn, but almost unaltered in E. ophiuroides and P. vaginaturn. The content of leaf water soluble sugar was little changed in A. cornpressus and Z. japonica, whereas increased in other grasses. In contrast, the content of root water soluble sugar was decreased in all grasses. The results indicate that the chilling tolerant species, e.g.E, ophiuroides, was characteristic of stable photosynthetic rate and higher level of leaf water soluble sugar during chilling stress in comparison to the chilling sensitive turfgrass species.