不同烟草品种（系）苗期钙调素活性和叶片钾含量对钾胁迫的响应

通过水培试验研究了15个烟草品种(系)苗期钙调素活性和烟叶钾含量在钾胁迫下的变化趋势,结果表明,大多数品种(系)苗期钙调素活性随着营养液钾浓度的升高而呈现增加的趋势,其中K326的增加趋势比较明显,低钾、中钾和高钾条件下钙调素的活性分别比对照增加11.26％、49.56％、62.43％;少数品种(系)苗期钙调素活性呈现先增加后降低或直接降低的趋势,其中H80A270-2和湄潭大蛮烟杂交的F1代在低钾、中钾和高钾条件下分别比对照降低18.83％、18.29％、28.52％;大部分品种(系)烟叶的钾含量对营养液钾浓度的响应趋势与钙调素活性的变化趋势相同,营养液钾浓度、烟叶钾含量与烟叶钙调素活性的回归分析显示,外界钾浓度的变化先影响烟叶钾含量的变化,进而影响钙调素活性的变化.

Response of calmodulin activity and leaf potassium content to potassium stress in different varieties (strains) of tabacco seedling

Water-culture medium was used to study the response of calmodulin activity and leaf potassium content to potassium stress in 15 varieties (strains) of tabacco seedling. The results indicated that calmodulin activity tended to increase with the increase of potassium content in nutrient solution in most different varieties (strains) of tabacco seedling. Under the treatment of low, medium and high potassium content, calmodulin activity of K326 increased by 11.26%, 49.56% and 62.43% respectively, compared with control. In minority varieties (strains) of tabacco seedling, calmodulin activity decreased straight down, or increased at first and then decreased with the increase of potassium content in nutrient solution. Calmodulin activity of H80A270-2 and tobacco hybrid F1 of Meitan and Daman the decreased by 18.83%, 18.29% and 28.52% respectively under the treatment of low, medium and high potassium content, compared with control group. The response of leaf potassium content to nutrient solution potassium content was corresponding to the variation of calmodulin activity in most varieties (strains). Regression analysis of nutrient solution potassium content, leaf potassium content and leaf calmodulin activity showed that variation of outside potassium content would firstly influence leaf potassium content, and then affect leaf calmodulin activity.