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ACID EFFLUX PATTERNS OF PRIMARY AND LATERAL ROOTS OF PHASEOLUS VULGARIS (FABACEAE)
Author(s) -
Moore Randy
Publication year - 1984
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1984.tb11970.x
Subject(s) - phaseolus , efflux , auxin , biology , gravitropism , botany , root hair , fabaceae , biophysics , biochemistry , arabidopsis , mutant , gene
Graviresponding primary roots of Phaseolus vulgaris were characterized by more acid efflux on the upper (i.e., rapidly growing) side of the root than on the lower side of the root. Acid efflux patterns of the upper and lower sides of horizontally‐oriented lateral roots were symmetrical. Addition of sodium orthovanadate (an inhibitor of auxin‐induced H + efflux) to the growth medium abolished gravicurvature and development of acid efflux asymmetry in horizontally‐oriented roots. These results 1) support the suggestion that auxin redistribution may cause the asymmetry of acid efflux that mediates gravitropism, and 2) indicate that the lack of an auxin‐induced asymmetry of acid efflux may be involved in explaining the minimal graviresponsiveness of lateral roots.