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HABTE M; BYAPPANAHALLI MN; RAM J. 1994. RESPONSE OF SAUROPUS-ANDROGYNUS TO SOIL-PHOSPHORUS CONCENTRATION AND MYCORRHIZAL COLONIZATION. JOURNAL OF PLANT NUTRITION. 17(2-3):511-521. Address: HABTE M, UNIV HAWAII,DEPT AGRON & SOIL SCI,1910 E W RD,HONOLULU,HI 96822
Thirty three-day-old seedlings of nonmycorrhizal Sauropus androgynus were transplanted into pots containing a subsurface Oxisol uninoculated or inoculated with Glomus aggregatum at three target soil solution phosphorus (P) concentrations. While no evidence of vesicular-arbuscular mycorrhizal fungal (VAMF) colonization was noticed in the uninoculated soil, sauropus roots were colonized to the extent of 54%, 60% and 38% in the inoculated soil if target soil P concentrations were 0.014, 0.02 and 0.2 mg/L. VAMF colonization led to significant increases in tissue P and shoot dry matter accumulation at the first two soil P concentrations but not at the highest concentration. Root dry matter yield of mycorrhizal sauropus was greater than that of nonmycorrhizal sauropus at all soil P concentrations tested. Although mycorrhizal inoculation effects at soil P concentrations of 0.014 and 0.02 mg/L were comparable, growth of mycorrhizal plants was greater at the latter P concentration than at the former. Growth of mycorrhizal sauropus at this P concentration was also comparable to non-mycorrhizal growth of the plant at soil P concentration of 0.2 mg/L. Based on the growth responses observed sauropus was classified as a highly mycorrhizal dependent species.
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