摘要
为给小麦抗旱性快速鉴定中气冠温差（CTD）的应用提供依据,采用20个冬小麦品种,设置水、旱两种处理,研究了冬小麦不同抗旱节水性品种的气冠温差CTD的信号表达差异及其最佳测定时期（生育期、单日时间）和影响因素,探讨品种鉴定筛选的量化评判指标。结果表明,在小麦扬花期的13∶30-14∶00时利用红外测温仪和精密温度计测定CTD,能够较好地鉴别出不同品种对水分反应的生理特性差异。不同小麦品种间的CTD差异很大,但不同水旱处理的CTD变化趋势基本一致。小麦扬花期（4月30日前后）CTD出现最高值,单日测定时间在13∶30-14∶00时出现最高值,且品种间差异较大。旱作处理下CTD平均值为7.09℃,变化范围为5.6-8.5℃;灌水处理CTD平均值8.81℃,变化范围为7.8-10.3℃;CTD与产量、抗旱指数及水分利用效率均呈极显著正相关,因此CTD既可作为旱作条件下抗旱品种的选择指标,也可作为灌溉条件下高效节水品种的选择指标。CTD≥7.92℃的品种抗旱性好,CTD≥9.55的品种水分利用效率高。
The study were conducted to determine the parmeters of CTD, the correlation of CTD and drought resistance,the correlation of CTD and water-saving ability. 20 wheat cultivar were grown under dryland and irrigation. Great differences in CTD were observed in different cultivars under each treatment. CTD can be determined on 13 ： 30-14 ： 00 in wheat flowering stage. The average of CTD was 7.09℃ in dryland,ranging from 5.6℃ to 8.5℃, and the average of CTD was 8.81℃ in irrigation ranging from 7.8 to 10.3℃. The CTD was highly correlated with the yield and DRI and WUE under each treatment. The cultivar was higher drought resistance if its CTD was greater than 7.92℃, the cultivar was also higher water-saving if its CTD was greater than 9. 55℃. These results indicated CTD was a signal of physiological expression of winter wheat under water stress, which can be a selection criterion in winter wheat for drought resistance and water-saving.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2007年第3期533-538,共6页
Journal of Triticeae Crops
基金
国家"863计划"项目(2006AA100201)
陕西省科技攻关项目(2006K01-G1)
关键词
冬小麦
气冠温差
抗旱指数
水分利用效率
Winter wheat
Canopy temperature depression （CTD）
Drought resistance index （DRI） Water use efficiency（WUE）
