Effects of 4-(phenylacetylene)benzoic acid on seed germination and seedling growth of white mustard
Aims:This paper aims to investigate the effects of 4-(phenylethynyl)benzoic acid(4-pBA)on white mustard seeds and seedling growth to provide theoretical support for its application in the growth regulation of plants such as white mustard(Sinapis alba L.).Methods:White mustard seeds were treated with solutions of 4-pBA at concentrations of 5 μmol·L-1,25 μmol·L-1,100 μmol·L-1,and 500 μmol·L-1.The effects of 4-pBA on seed germination rate,embryonic root length,amylase activity,peroxidase(POD),superoxide dismutase(SOD),and catalase(CAT)activity of the seeds were analyzed.Seedling growth parameters and the activity of the three antioxidant enzymes were also measured.Results:The germination rate of white mustard seeds was not affected by the treatment with 4-pBA solutions.However,the embryonic root length and the emergence rate were significantly inhibited;and the α-amylase activity and the antioxidant enzyme activity in white mustard seeds significantly were reduced by 500 μmol·L-1 4-pBA.The 5 μmol·L-1 4-pBA solution showed no significant effect on root length,plant height,leaf length,leaf width,fresh weight,and dry weight of white mustard seedlings.The 25 µmol·L-1 4-pBA solution only reduced leaf length,leaf width,and dry and fresh weights of the seedlings.However,the 100 μmol·L-1 4-pBA solution significantly reduced all growth parameters.Furthermore,5,25 and 100 μmol·L-1 4-pBA solutions significantly decreased POD,SOD,and CAT activity in white mustard leaves.Conclusions:4-pBA exhibits growth-inhibiting functions in white mustard and has the potential to be developed as a novel plant growth regulator.
4-(phenylacetylene)benzoic acidSinapis alba L.seed germinationseedling growth
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