ACTA HORTICULTURAE SINICA ›› 2017, Vol. 44 ›› Issue (6): 1038-1048.doi: 10.16420/j.issn.0513-353x.2017-0010

• Research Papers • Previous Articles     Next Articles

Study on Time Effects of Exogenous 5-Aminolevulinic Acid Treatment on Alleviating Salinity Injury in‘Benihoppe’Strawberry

WU Wenwen,AN Yuyan,and WANG Liangju*   

  1. (College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China)
  • Online:2017-06-25 Published:2017-06-25


In order to determine the suitable time for 5-aminolevulinic acid(5-ALA)application to alleviate salinity injury in strawberry(Fragaria × ananassa Duch.‘Benihoppe’),exogenous 10 mg ? L-1 5-ALA solution was rhizospherically applied at 5 days before,simultaneously or 3 days after 100 mmol ? L-1 NaCl treatment,and the results showed that the alleviating effect was best in the pretreatment. This result implies that 5-ALA is more preventive than therapeutic for strawberry against salt stress. After then,another experiment was carried out,where 10 mg ? L-1 5-ALA solutions were rhizospherically pretreated to strawberry plants 5,10,15 or 20 days before NaCl treatment and the result showed that the pretreatment prior 20 d was the best effective treatment,which means that the earlier the strawberry was pretreated with 5-ALA,the less of salinity injury was found. It was observed that the possible alleviating mechanisms of 5-ALA against salt stress in strawberry may include the follows. (1) 5-ALA alleviated the decrease of leaf chlorophyll content and Chl.b/a ratio induced by salinity in strawberry. (2) 5-ALA induced the additional increase of antioxidant enzyme activities and decreased the production rate of superoxide anion in the leaves and roots of strawberry under salt stress. (3) 5-ALA was beneficial to intersystem electron transport from PSⅡ to PSⅠ,increasing the energy conversion efficiency during light energy absorption,harvest and transport,reducing heat dissipation,and improving photosynthetic capacity under salt stress. (4) 5-ALA alleviated the inhibition of plant growth induced by salt stress,including shoots and roots,especially the latter.

Key words: strawberry, 5-ALA;salt stress, chlorophyll fluorescence, reactive oxygen metabolism, time effect

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