The open reading frame of OsPIN1b was amplified from the cDNA of WT/NIP, and the 2.6 kb promoter of the OsPIN1b was amplified from WT/NIP genomic DNA. 35S:OsPIN1b-sGFP and ProOsPIN1b:GUS vectors were constructed as described previously [25]. These vectors were introduced into Agrobacterium strain EHA105 and transformed into WT/NIP calli. Primer sequences are listed in Table S1.
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