Effects of 4 dwarfing rootstocks on high-salt resistance of'Miyato Fuji'apple
The objective of this work is to provide references for the application of apple dwarfing rootstocks in soil salinization areas and high-salt resistance mechanism study,through the comparative analysis of effects of different dwarfing rootstocks on the growth of'Miyato Fuji'apples under salt stress.In this study,2-year-old potted'Miyato Fuji'apple plants grafted on four kinds of apple dwarfing rootstocks separately,were used as test materials.The control,0.5％NaCl and 1.0％NaCl solution stress treatments were processed for 60 days and then salt damage index,growth,mineral element contents and other indicators were investigated.The results showed that the'Miyato Fuji'apple plants grafted on G11 dwarfing rootstock showed the highest salt damage index,followed by SH6 and M9T337,and the'Miyato Fuji'apple plants grafted on G935 dwarfing rootstock performed the lowest salt damage index,suggesting the most high-salt resistance.Under salt stresses,the relative growth rates of all'Miyato Fuji'apple plants were significantly inhibited,while the highest biomass accumulation was observed on those'Miyato Fuji'apple plants grafted on G935 dwarfing rootstock,and'Miyato Fuji'apple plants grafted on G11 dwarfing rootstock showed the lowest biomass.Besides,the mineral element detection of'Miyato Fuji'apple leaves showed that under the 1.0％NaCl stress treatment,the'Miyato Fuji'apple plants grafted on G11 dwarfing rootstock got the largest Na+content increased for 34.4 times higher than its control.While the increasing degree of Na+content in the'Miyato Fuji'apple plants grafted on G935 dwarfing rootstock was the lowest with only 2.4 times higher than the control plants.Thus,we conclude that the high-salt resistance of'Miyato Fuji'apple plants grafted on different dwarfingrootstocks are G935＞M9T337＞SH6＞G11,and the ability of dwarfing rootstock to effectively maintain low sodium levels in the above ground may be the key factor in the high salt-resistance characteristic.
appledwarfing rootstock'Miyato Fuji'salt stresssodium ion transportation
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