Effects of Potassium on Photoassimilate of Apricot Leaf and Fruit Quality
[Objective]The effects of potassium on the photosynthesis and photoassimilate of apricot leaves were investigated,so as to provide theoretical basis for potassium nutrient management of apricot.[Method]The 7-year old'Jizaohong'apricot was used as the test material.In the fruit expansion stage,K2O with the concentration of 0(CK),0.5％(T1),1.0％(T2),1.5％(T3),2.0％(T4)was applied to the leaves around the fruit.The effects of different concentrations of K2 O on leaf chlorophyll content,photosynthetic performance,sorbitol,sucrose,sorbitol 6-phosphate dehydrogenase(S6PDH),sucrose phosphate synthase(SPS)and fruit quailty were studied.[Result]Compared with CK,the chlorophyll content,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tt),sorbitol content,sucrose content,S6PDH and SPS activities of leaves were increased by different concentrations of potassium fertilizer,and the indexes of T3 treatment had the highest value,which were 1.59,1.20,2.25,2.24,1.23,7.08,3.34 and 2.04 times of CK,respectively,and the differences reached significant level.Potassium fertilizer had no obvious effect on apricot fruit size,but significantly affected the contents of soluble solid(SSC)and titratable acid in apricot fruit.The SSC and titratable acid contents of apricot fruit under T3 treatment increased by 1.67 percentage points and 0.11 percentage points,respectively,compared with CK,which showed the most significant effect.[Conclusion]Under the experimental conditions,1.5％K2O concentration has the best treatment effect,which is beneficial to improve the photosynthetic performance of apricot leaves,promote the accumulation of photoassimilate,and thus improve the fruit quality.
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NSTL
万方数据
维普
