Heterotrophic gain of carbon from hosts by the xylem-tapping root hemiparasite Olax phyllanthi (Olacaceae)

absorption de substances nutritives arbuste arbustos c3 plants c4 plants carbon carbone carbono host parasite relations isotope isotopes nutrient uptake olacaceae plantas c3 plantas c4 plante en c3 plante en c4 shrubs technique des traceurs tracer techniques xilema xylem