| 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. |
