Analysis of the Reason for Alleviating Sugar-dropping of Feizixiao Litchi Fruits by Foliar Application of Calcium and Magnesium Fertilizers
Sugar-dropping in the pulp is a phenomenon at fruit maturity in Feizixiao litchi.Previous studies have shown that foliar spraying mixed nutrients of calcium and magnesium can effectively slow down the sugar-dropping of the pulp,and inhibiting pulp respiration is one of the reasons.In this paper,the effects of foliar spraying 0.3％CaCl2,0.3％MaCl2,0.3％CaCl2+0.3％MaCl2 and clean water(control)on the respiration rate of pentose phosphate pathway in Feizixiao litchi pulp were discussed.Dynamic changes in soluble sugar content,calcium and magnesium contents,PPP pathway respiration rate,and activity of key enzymes in fruit pulp at different developmental stages were measured and compared.The results showed that,except treat-ment of 0.3％CaCl2+0.3％MaCl2 alleviated the sugar-dropping in the pulp,overcoming the phenomenon of sugar-dropping,the other treatments did not show significant effects.It was speculated that 0.3％CaCl2+0.3％MaCl2 treatment can inhibit the respiration rate of PPP through inhibiting the activity of the PPP key en-zymes,thus inhibiting the total respiration rate and reducing the respiration loss of sugar in pulp.
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