Alleviation of growth inhibition of pakchoi seedlings under calcium nitrate stress by exogenous polyamines
A hydroponics experiment was conducted on calcium nitrate [Ca (NO3)2]-stress pakchoi Hanxiao to study the effects of different kinds and concentrations of exogenous polyamines on the growth and photosynthesis of pakchio seedlings.The stress of 80 mmol/L Ca(NO3)2 significantly reduced plant height,leaf number,dry and fresh weight,leaf area,root length,root volume,and root vigor,and decreased the contents of photosynthetic pigments and photosynthesis on day 10.The suppressive effects of Ca (NO3)2 on pakchio seedlings could be alleviated by spraying exogenous spermine (Spm),spermidine (Spd),or putrescine (Put),with the concentrations ranging from 1.0 to 15.0 mmol/L Put,0.1 to 1.5 mmol/L,or 0.1 to 1.0 mmol/L,respectively.0.5 mmol/L Spd,0.3 mmol/L Spm,or 5.0 mmol/L Put exhibited the strongest alleviation.
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