DA-6对不同品种北美冬青生长和生理特性的影响

Effects of DA-6 on growth and physiology of different Ilex verticillata varieties

以北美冬青‘冬红’‘冬黄’‘格瑞’和‘奥斯特’4个品种营养钵苗为试验材料,通过施用不同质量浓度(20,30,50 mg/L)的DA-6,研究其对北美冬青株高、冠幅、单株生物量、光合及可溶性糖等的影响。结果表明:30 mg/L DA-6处理下,‘奥斯特单株’‘格瑞’的生长最好;20 mg/L DA-6处理下,‘冬黄’‘冬红’生长最好。各品种株高、冠幅、单枝长及生物量最大,其中‘奥斯特’单株鲜质量和干质量分别达到68.84,31.90 g。不同质量浓度的DA-6处理,各品种净光合速率、气孔导度、蒸腾速率与对照相比,均呈现出不同程度的增加,其中20 mg/L处理,‘冬红’净光合速率最大,达到8.44μmol CO_(2)/(m^(2).s)。一定质量浓度的DA-6可促进北美冬青叶片可溶性糖积累,其中30 mg/L处理‘冬红’‘格瑞’,可溶性糖达到最大值,分别比对照增加了52.34%,36.09%。

In order to further improve the Ilex verticillata cultivation techniques,after taking such varieties as‘Winter Red’,‘Winter Gold’,‘Gray’and‘Oosterwijk’for test materials,the effects of DA-6 on the plant height,crown width,biomass,photosynthesis and soluble sugar were studied.The results showed that‘Oosterwijk’and‘Gray’treated with 30 mg/L DA-6 could get best growth while‘Winter Red’and‘Winter Gold’treated with 20 mg/L DA-6 could do.The plant height,crown width,branch length,biomass of them could reach maximum,especially with 31.90 g dry weight and 68.84 g wet weight in‘Oosterwijk’.The Pn,Gs and Tr were increased more than CK under different DA-6 concentration treatment.Especially,the Pn of‘Winter Red’treated with 20 mg/L DA-6,got maximum,reaching 8.44μmol CO_(2)/(m^(2.)s).DA-6 could promote the soluble sugar accumulation of I.verticillata varieties tested,and soluble sugar contents of‘Winter Red’and‘Gray’treated with 30 mg/L DA-6 were increased by 52.34%and 36.09%respectively,more than that of CK.