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Bulletin of Botanical Research ›› 2024, Vol. 44 ›› Issue (6): 832-842.doi: 10.7525/j.issn.1673-5102.2024.06.004

• Physiology and Ecology • Previous Articles     Next Articles

Effect of 2,4-D Treatment on Calcium Uptake and the Relationship with IAA and Organic Acid Metabolism in Cerasus humilis Fruit

Guoshi SU1, Li ZHANG1, Suotong LIU2, Xiaoyan LI1, Zhimao QIN1, Jinli GUO1()   

  1. 1.College of Horticulture and Plant Protection,Inner Mongolia Agricultural University,Hohhot 010010
    2.Qingshuihe County Forestry and Grassland Bureau,Qingshuihe 011600
  • Received:2024-09-21 Online:2024-11-20 Published:2024-11-22
  • Contact: Jinli GUO E-mail:guojinli1111@163.com

Abstract:

The objective of this study was to investigate the relationships between calcium uptake, organic acid metabolism and IAA during the development and ripening of Cerasus humilis fruit by treatment with exogenous plant growth regulator 2,4-D. The low-calcium C. humilis MY-9 fruit in Inner Mongolia was sprayed for 2,4-D at the young fruit stage and the coloring and swelling stage, and the effects on calcium uptake and organic acid metabolism and IAA during fruit development and maturity under 2,4-D treatment were studied with clean water treatment as control, and correlation analysis was carried out. The results showed that (1)In terms of calcium uptake rate, the uptake rate of pectin calcium, active calcium and total calcium was similar to that of the control, which increased first and then decreased, the uptake rate of the above three types of calcium from hard core stage to maturity stage was significantly higher than that of the control. On the contrary, the uptake rate of water-soluble calcium decreased first and then increased, and the value at late stage of fruit development was significantly higher than that of the control. In terms of calcium uptake activity, the changes of the four calcium forms were similar, showing a continuous decrease, and the calcium uptake activity of the treatment was significantly higher than that of the control. In terms of relative-growth calcium uptake, the changes of the four calcium forms were consistent, all of which increased first and then decreased, and the value of treatment at the hard-core and full-maturity stages was significantly higher than that of the control. (2)The activity of NAD-MDH, the amount of malic acid and organic acid increased with the development and maturity of fruits, and the activity of NADP-ME and citric acid decreased with the development and maturity of fruits, and the content of organic acids and related enzymes could be increased to varying degrees by 2,4-D treatment. (3)On the whole, the IAA content of the treatment and the control increased first and then decreased, and there were significant differences between the treatment and the control during the whole development period, and the 2,4-D treatment could significantly increase the IAA content of C. humilis fruit. (4)Correlation analysis showed that the uptake rate and relative-growth uptake rate of water-soluble calcium were significantly positively correlated with NAD-MDH activity, malic acid and organic acids contents, and negatively correlated with IAA content, NADP-ME activity and citric acid content. The uptake activities of pectin calcium, active calcium and total calcium were significantly positively correlated with IAA content, NADP-ME activity and citric acid content, and negatively correlated with NAD-MDH activity, malic acid and organic acids content. 2,4-D treatment increased the correlation between calcium uptake and citric acid content. In conclusion, 2,4-D treatment can increase the calcium uptake capacity, organic acid metabolism and IAA content in C. humilis fruit. With the enhancement of NAD-MDH activity, the contents of malic acid and organic acid increased, which would promote the uptake of water-soluble calcium, but decreased the uptake capacity of pectin calcium, active calcium and total calcium, while the increase of citric acid and IAA content would reduce the uptake of water-soluble calcium, and promote the uptake of pectin calcium, active calcium and total calcium. The 2,4-D treatment regulated the calcium uptake of fruits by increasing the metabolism of organic acids and the content of IAA.

Key words: Cerasus humilis fruits, 2,4-D, calcium uptake, organic acid metabolism, IAA

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