Auxin distribution is differentially affected by nitrate in roots of two rice cultivars differing in responsiveness to nitrogen.

ABSTRACT:

Background and aims

Although ammonium (NH4(+)) is the preferred form of nitrogen over nitrate (NO3(-)) for rice (Oryza sativa), lateral root (LR) growth in roots is enhanced by partial NO3(-) nutrition (PNN). The roles of auxin distribution and polar transport in LR formation in response to localized NO3(-) availability are not known.

Methods

Time-course studies in a split-root experimental system were used to investigate LR development patterns, auxin distribution, polar auxin transport and expression of auxin transporter genes in LR zones in response to localized PNN in 'Nanguang' and 'Elio' rice cultivars, which show high and low responsiveness to NO3(-), respectively. Patterns of auxin distribution and the effects of polar auxin transport inhibitors were also examined in

SUBMITTER: Song W 

PROVIDER: S-EPMC3806541 | biostudies-literature | 2013 Nov

REPOSITORIES: biostudies-literature