探讨观赏海棠适应土壤干旱胁迫及复水的生长生理机制,筛选观赏海棠抗旱性鉴定的生长生理指标。研究盆栽人工模拟干旱条件及复水条件下的13个观赏海棠品种的叶片相对含水量(RWC)、叶片失水量(WWL)、新梢增长率(SGR)、比叶重(SDW)、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Cs)、水分利用效率(WUE)、相对电导率(REC)、脯氨酸含量(PRO)、可溶性蛋白含量(SPC)和旱害指数(DI)的变化,并采用聚类分析法对品种的抗旱性进行综合评价。土壤干旱胁迫明显降低观赏海棠的RWC,WWL,SGR,Pn,Tr和Cs; 提高DI,WUE和REC; 对SDW,PRO和SPC的影响不一。供试观赏海棠品种抗旱性可分4类,比利时直立和王族为特抗型; 比利时垂枝、凯尔斯和钻石为高抗型; 当娜、高原之火、红花、绚丽和雪球为中抗型; 红丽、红玉和印第安魔力为低抗型。不同观赏海棠品种对土壤干旱胁迫和复水的响应不同,其抗旱性存在差异。
Growth and physiological mechanism for ornamental crabapple in re-sponses of to soil drought stress and re-watering was investigated, and some growth and physiological parameters for evaluating drought resistance were selected. Changes in leaf relative water content(RWC), water weight loss(WWL), ratio of shoot growth(SGR), special leaf dry weight (SDW), net photosynthesis(Pn), transpiration(Tr), stomatal conductivity(Cs), water use efficiency(WUE), relative electric conductivity (REC), proline content(PRO), soluble protein content(SPC) and drought injury index(DI) of 13 ornamental crabapple cultivars were examined under soil drought stress by withdrawing water and then re-watering in potting plants. Drought resistance of ornamental crabapple cultivars was evaluated synthetically by cluster analysis. The results indicated that soil drought stress reduced significantly RWC, SGR, WWL, P</em>n, Tr and Cs, increased significantly DI, WUE and REC, but had no consistent effects on SDW, PRO and SPC in ornamental crabapple cultivars. Drought resistance of ornamental crabapple cultivars were divided into 4 classifications by cluster analysis. ‘Belgian Erect’ and ‘Royalty’ were the strongest drought-resistant, followed by ‘Belgian Weep’,‘Kelsey’ and ‘Sparkler’, and then by, ‘Radiant’ and ‘Snowdrift’, while ‘Red Splendor’, ‘Red Jade’ and ‘Indian Magic’ belonged to the lowest drought-resistance. It proved that there was a significant differences in resistance to the soil drought stress among the ornamental crabapple cultivars.
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