首页|Nitrogen-potassium balance improves leaf photosynthetic capacity by regulating leaf nitrogen allocation in apple
Nitrogen-potassium balance improves leaf photosynthetic capacity by regulating leaf nitrogen allocation in apple
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Nitrogen(N)and potassium(K)are two important mineral nutrients in regulating leaf photosynthesis.However,the influence of N and K interaction on photosynthesis is still not fully understood.Using a hydroponics approach,we studied the effects of different N and K conditions on the physiological characteristics,N allocation and photosynthetic capacity of apple rootstock M9T337.The results showed that high N and low K conditions significantly reduced K content in roots and leaves,resulting in N/K imbalance,and allocated more N in leaves to non-photosynthetic N.Low K conditions increased biochemical limitation(BL),mesophyll limitation(MCL),and stomatal limitation(SL).By setting different N supplies,lowering N levels under low K conditions increased the proportion of water-soluble protein N(Nw)and sodium dodecyl sulfate-soluble proteins(Ns)by balancing N/K and increased the proportion of carboxylation N and electron transfer N.This increased the maximum carboxylation rate and mesophyll conductance,which reduced MCL and BL and alleviated the low K limitation of photosynthesis in apple rootstocks.In general,our results provide new insights into the regulation of photosynthetic capacity by N/K balance,which is conducive to the coordinated supply of N and K nutrients.
College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an 271018,Shandong,China
Apple Technology Innovation Center of Shandong Province,Tai'an 271018,Shandong,China
Yantai Academy of Agricultural Sciences,Institute of Pomology,Yan'tai 265500,Shandong,China
国家重点研发计划Special Fund for the Natural Science Foundation of Shandong ProvinceEarmarked Fund for CARSTaishan Scholar Assistance Program from Shandong Provincial GovernmentXinlianxin Innovation Center for Efficient Use of Nitrogen Fertilizer
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