Abstract
Application of 100 microM aspterric acid (AA), a pollen growth inhibitor, with different concentrations of indole-3-acetic acid (IAA) results in the recovery of normal pollen development of Arabidopsis thaliana. Treatment with 100 microM AA plus 5 mM IAA significantly induced the normal seed production. Treatment with 100 microM N-1-naphthylphthalamic acid (NPA), a polar auxin transport inhibitor, did not reduce the pollen growth but inhibited seed production. 100 microM NPA plus 5 mM IAA did not induce any seed production. The endogenous level of IAA in stems and leaves of A. thaliana treated with 100 microM AA was similar to that of the untreated control. In contrast to AA treatment, the IAA level by the treatment with 100 microM NPA was about twice as much as that of the untreated control. These results suggest that AA affects the Arabidopsis reproductive growth without inhibiting IAA biosynthesis and transport.
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