Effects of boron content in nutrient solution on photosynthetic characteristics and quality of garlic seedling

Effects of different boron levels on boron content, growth, photosynthetic characteristics and qualities of garlic seedlings were studied by using nutrient solution. Four different boron concentrations at 0, 0.5, 1.0 and 1.5 mg/L were designed. The result show that the boron contents of garlic seedlings are increased with the boron concentrations ranging from 0 to 1.5 mg/L, which reaches the maximum when the boron concentration in nutrient solution is 1.5 mg/L. At the same time, the garlic seedling increments，photosynthetic pigment contents，photosynthetic parameters (Pn，Tr，Gs) in leaf laminas are increased with the increase of boron levels in the range of 01.0 mg/L, and those reach their maxima when the boron content is 1.0 mg/L. Meanwhile, the contents of vitamin C (Vc), soluble protein, allicin in leaf laminas and pseudostems are increased by 33.5% and 14.5%, 40.5% and 35.9%, 41.0 % and 57.2 % compared to the treatment of 0mg/L boron concentration. When the boron concentration is 1.5 mg/L, these indexes are decreased. The contents of soluble sugar and free amino acids in leaf laminas are reduced by 34.3% and 22.8% when the boron concentration is 1.0mg/L, while the contents of soluble sugar and free amino acids in pseudostems are improved by 160.5% and 43.6%.