Minjiang River Wild Bermudagrass Biological Characteristics And Its Cold Resistance

Studies on Biological Characteristic and Cold Resistance of Native Bermudagrass in Mini iang Watershed Xiong Xi (Department of Grassland Science, Sicbuan Agricultural University Yaan, 625014, Sichuan) Abstract: Twenty native bermudagrass of Mini iang watershed have been experimented through plotting, and simultaneously two interspecific bermudagrass hybrid cultivars Tifway (triploid) and Jackpot (tetraploid) are tested as the controls. Biological characteristic and cold resistance have been studied. The result showed as follows: l.Formation speed of native bermudagrass is about two months. About the phenological phase of native bermudagrass,they are the same largely: in May they start head sprouting and blooming, in June fruiting, in December they start dormant period, they get green in March next year. Moreover, average green period is 278 days (264d?87d). To the morphological features of native bermudagrass, stand natural height, diameter of stolon and internode length, blade length and width, reproductive infiorenscence length,floret number of each spikelet have significant different. Their ranges respectively are 7.33cm?7.OOcm, 0.73niim-1.66myn, I .22cm?.5 1cm, 1 .22cm?.5 1cm, 1 .SOcm?.7Ocm, 0.200mm桹.348mm, 7.36cm挆24.Ocm, 4~?, 2.35cm挆4.Olcm, 28-35. 2.The chlorophllous content of native bermudagrass in Minjiang watershed is higher than Tifway, except SAU99-26. The results of Li?0 through the way of electric conductivity after a period of cold stress show, half lethal temperature of all native bermudagrass have debase, at the same time, their LT~ are all lower than the LT50 of control Tifway, and the lowest Li?0 is ?4.44 ~C which belonging to SAU99-36 which come from Mao County. 3.The results of evaluation of turf quality of native bermudagrass in Minjiang 40 watershed show,SAU99-33 and SAU99-34 who come from Wenchuan county have the highest score. In addition to their morphological features, we can conclude that the two materials have good quality, and they can be used as lawn grass directly, and even be used as sportsland grass.