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Nutrient Deficiency Affects Root Architecture of Young Seedlings of Malus hupehensis(Pamp) Rehd. Under Artificial Medium Cultivation

FAN Wei-guo,YANG Hong-qiang(Institute of Horticulture Science and Engineering,Shandong Agricultural University,Taian 271018)  
【Objective】The project aimed to establish models between root architecture(RA) changes and the nutrition,mold ideal root architectures of apple trees.It also intended to improve the nutrient uptake efficiency and to further explore the functional mechanism of nutrient elements during the course of RA construction。【Method】The cultivation system of filter paper was used to research nutrient deficiency on RA of Malus hupehensis(Pamp.) Rehd.【Result】 Researchers found there may be 8 types of RA.In a complete Hogland solution,the main type of RA is “lateral roots gathering upper and middle of primary root”.With the lack of P,K or Ca,the main type of RA is “lateral roots gathering upper primary root”,and the “lateral roots gathering upper and middle of primary root” of RA decreases.But when short of P,the “lateral roots gathering upper and lower of the primary root” increases,and the type of “lateral roots gathering on the middle of primary root” decreases,with the types of RA diversified,Under K-deficiency,the type of “no lateral root” increases and “lateral roots gathering on the middle of primary root” types decrease,and the percentage of “no lateral root”,“lateral roots gathering upper primary root” and “lateral roots gathering upper and middle of primary root” types accounts for 97.9% in all,with the types of RA simplified.Lacking Fe,Mg or Zn,the main type of RA is “lateral roots gathering upper and middle of primary root”,but the “lateral roots evenly-distributed on primary root” increases;the main type of RA is “lateral roots evenly-distributed on primary root” under the condition of N-deficiency,and the types of RA turn out to be diversified.【Conclusion】There is a close relationship between nutrient deficiency and RA changes.Owing to various forms of nutrient deficiency,correspondingly different types of RA have been produced.
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