TY - JOUR
T1 - Effect of IAA on symbiotic germination of an Australian orchid and its production by orchid-associated bacteria
AU - Wilkinson, K.W.
AU - Dixon, K.W.
AU - Sivasithamparam, Krishnapillai
AU - Ghisalberti, Emilio
PY - 1994
Y1 - 1994
N2 - Seven isolates of orchid-associated bacteria (OAB) belonging to five species were tested for their effect on mycorrhiza-assisted germination of the terrestrial orchid Pterostylis vittata. Hormone standards were also tested to evaluate their potential roles in the germination and development of the orchid. Strains of Pseudomonas putida, Xanthomonas maltophilia and Bacillus cereus promoted symbiotic germination, whereas certain strains of P. putida and an Arthrobacter species reduced it. Symbiotic germination was enhanced by IAA, inhibited by gibberellic acid and suppressed by kinetin. Each species of OAB produced IAA, although the conditions of growth affected the production of the auxin. IAA was not produced by the mycorrhizal fungus from P. vittata under the test conditions. Enhancement of symbiotic germination development may have resulted either from the production of IAA by the OAB and/or by the induction of endogenous hormones in the orchid by the metabolites of the bacteria and/or mycorrhizal fungus.
AB - Seven isolates of orchid-associated bacteria (OAB) belonging to five species were tested for their effect on mycorrhiza-assisted germination of the terrestrial orchid Pterostylis vittata. Hormone standards were also tested to evaluate their potential roles in the germination and development of the orchid. Strains of Pseudomonas putida, Xanthomonas maltophilia and Bacillus cereus promoted symbiotic germination, whereas certain strains of P. putida and an Arthrobacter species reduced it. Symbiotic germination was enhanced by IAA, inhibited by gibberellic acid and suppressed by kinetin. Each species of OAB produced IAA, although the conditions of growth affected the production of the auxin. IAA was not produced by the mycorrhizal fungus from P. vittata under the test conditions. Enhancement of symbiotic germination development may have resulted either from the production of IAA by the OAB and/or by the induction of endogenous hormones in the orchid by the metabolites of the bacteria and/or mycorrhizal fungus.
U2 - 10.1007/BF00009292
DO - 10.1007/BF00009292
M3 - Article
SN - 0032-079X
VL - 159
SP - 291
EP - 295
JO - Plant and Soil: An International Journal on Plant-Soil Relationships
JF - Plant and Soil: An International Journal on Plant-Soil Relationships
ER -