Abstract: The effects of nutrient deficiency on root architecture(RA) of young seedlings in M. hupehensis Rehd. are studied by the menthe of paper-culture. The research dates show the types of RA may be classified 8 types(A,B,C,D,E,F,G and H type). In complete Hogland solution, the main type of RA is “lateral roots gather above and middle of primary root”(C type), while under P, K or Ca-deficiency, the main type of RA is “lateral roots gather above primary root”(B type), and the C type of RA decreases. But when P-deficiency, the “lateral roots gather above and low of the primary root”(G type) increases, and the type of “lateral roots gather on the middle of primary root” (D type) decreases, and the types of RA become more; As K-deficiency, the type of “no lateral root”(A type) increases and D type decreases, and the percentages of A, B and C types are 97.9% in all, the types of RA become simple; Under Fe, Mg or Zn-deficiency, the main type of RA is C, but the “lateral roots well-distributed on primary root”(H type) increases. The main type of RA is H under N-deficiency, and the types of RA become more.

Key words: M．hupehensis Rehd., paper-culture, Root architecture, Nutrient deficiency