钾素营养对大蒜生长、光合特性及品质的影响

采用溶液培养试验探讨了钾对大蒜苗期生长、生理生化指标及品质的影响。供试营养液K+浓度分别为0、3.0、6.0、9.0和12.0 mmol/L。结果表明，K+浓度在0～6.0 mmol/L范围内，大蒜苗期生长量、色素含量、净光合速率、可溶性蛋白质及大蒜素含量随K+浓度升高而增加；当达到9.0 mmol/L时，上述指标则呈下降趋势。营养液中K+浓度为6.0 mmol/L时，大蒜叶片及假茎生长量、光合色素含量、光合速率及蒸腾速率均最大，假茎及叶片大蒜素含量分别比0 mmol/L时高出63.57%和62.04%，叶片可溶性蛋白质含量明显高于其他处理；假茎及叶片可溶性糖含量在K+浓度为9.0 mmol/L时最高。在施钾各处理间游离氨基酸含量差异不显著，但均显著低于不施钾处理。总之，钾能明显促进大蒜苗期假茎和叶片生长，增加叶片色素含量，极大改善叶片光合特性，提高大蒜幼苗营养品质。营养液K+浓度以6.0 mmol/L时表现最好。

Effects of potassium on growth, photosynthetic characteristics and quality of garlic seedlings

In this study,a solution culture experiment of potassium was carried out to investigate the effects of potassium on growth,photosynthetic characteristics and quality of garlic seedling.There were five different K+contents,0,3.0,6.0,9.0 and 12.0 mmol/L,in the experiment.The results indicate that in the range of 0-6.0 mmol/L,the garlic seedling increment,pigment content,net photosynthesis rate,soluble protein and allicin contents are increased with increasing concentration of K+,and then decreased with increa...