文献类型：会议论文

英文题名：Cold sensitivity and biochemical adjustments in zoysiagrass under low temperature stress

作者：Wei, Shanjun[1] Zhou, Yijun[1] Li, Deying[2] Sun, Zhenyuan[3]

第一作者：Wei, Shanjun

通信作者：Sun, ZY[1]

机构：[1]Cent Univ Nationality Beijing, Coll Life & Environm Sci, Beijing 100081, Peoples R China;[2]North Dakota State Univ, Dept Plant Sci, Fargo, ND 58105 USA;[3]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

会议论文集：2nd International Conference on Turfgrass Management and Science for Sports Fields

会议日期：JUN 24-29, 2007

会议地点：Beijing, PEOPLES R CHINA

语种：英文

外文关键词：Zoysia japonica Steud; cold tolerance; proline; malondialdehyde; soluble sugars

年份：2008

摘要：Common Zoysiagrass (Zoysia japonica) is widely used in the transition zone for sports turf due to its excellent texture and low demand of water. However, its green period and cold hardiness restricted use to a broader geographic region. The objective of this study was to investigate the field performance and related biochemical adjustment in zoysiagrass under low temperature stress during fall acclimation. Discoloration started when the average of minimum air temperature for 15 consecutive days (AT15) was below 15 degrees C followed by termination of shoot growth when AT15 was below 9.7 degrees C. Zoysiagrass went dormant when AT15 further decreased. Soluble sugar concentration in green leaves increased from 12.2 to 40.7 Mg.g(-1) FW from Sept. 8 to Nov. 8. Soluble sugar concentration in stolons peaked to 32.27, mg.g(-1) FW at AT15 of 14.6 degrees C and then decreased and maintained at about 25 mg.g(-1) until Nov. 8 with AT15 at 4.9 degrees C. Significant accumulation of proline in both green leaves and stolons happened during cold acclimation with the concentration in stolons increasing earlier than in the leaves. At the end of cold acclimation, proline concentration in stolons was 2.5 times that in the leaves. Significant total soluble protein increase was only detected in stolons although specifically induced proteins were found in both leaves (50 and 28 kD) and stolons (36 and 22 kD). Low temperature induced elevated malondialdehyde (MDA) levels in leaves during the cold acclimation. Increased MDA was also noticed in the stolons when AT15 was between 14.6 and 4.9 degrees C. The physiological impact and low temperature adaptation of the biochemical changes in zoysiagrass was discussed.