Physiological Response Characteristics of Ginger to Aluminum Stress
Ginger prefers acidic soil,while aluminum ions(Al3+)are easily released in acidic soil,which can cause toxicity to crops.This study investigated the effects of soil Al3+levels at 0(CK),250,500,750,and 1 000 mg·kg-1 on ginger growth and leaf physiological characteristics.The results showed that there was a dose effect of Al3+on the growth of ginger,soil 250 mg·kg-1 Al3+had a certain promotion effect on ginger growth,but with the increase of Al3+,the plant height,stem thickness and biomass of various organs were gradually reduced,at harvest,the fresh weight of roots,stems,leaves,and rhizomes of plants treated with 750 mg·kg-1 Al3+was reduced by 11.00%,9.32%,6.49%,and 21.24%,respectively,compared with that of CK.Higher concentrations of Al3+stress significantly reduced the pigment content of leaves and inhibited leaf water-gas exchange parameters,such as during the vigorous growth period,leaf chlorophyll a,b and net photosynthetic rate(Pn)of ginger treated with 750 mg·kg-1 Al3+were reduced by 65.89%,11.99%and 19.95%,respectively,compared with that of CK.In addition,soil Al3+stress also significantly increased the level of reactive oxygen species(ROS)in leaves,while the antioxidant enzyme activity showed a trend of gradual increase first and then decrease.
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