4.7 Article

Over-expression of OsPIN2 leads to increased tiller numbers, angle and shorter plant height through suppression of OsLAZY1

Journal

PLANT BIOTECHNOLOGY JOURNAL
Volume 10, Issue 2, Pages 139-149

Publisher

WILEY
DOI: 10.1111/j.1467-7652.2011.00637.x

Keywords

auxin efflux transporter; Oryza sativa; OsLazy1; OsPIN2; OsTAC1; plant architecture

Funding

  1. China National Basic Research Program 973 [2011CB100302]
  2. National Natural Science Foundation [30971854, 31071846]
  3. Jiangsu Natural Science Foundation [BK2010440]
  4. Qing Lan Project Priority Academic Program Development of Jiangsu Higher Education Institutions
  5. transgenic project [2008ZX08001-0052, 2009ZX08009-126B]

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Crop architecture parameters such as tiller number, angle and plant height are important agronomic traits that have been considered for breeding programmes. Auxin distribution within the plant has long been recognized to alter architecture. The rice (Oryza sativa L.) genome contains 12 putative PIN genes encoding auxin efflux transporters, including four PIN1 and one PIN2 genes. Here, we report that over-expression of OsPIN2 through a transgenic approach in rice (Japonica cv. Nipponbare) led to a shorter plant height, more tillers and a larger tiller angle when compared with wild type (WT). The expression patterns of the auxin reporter DR5::GUS and quantification of auxin distribution showed that OsPIN2 over-expression increased auxin transport from the shoot to the rootshoot junction, resulting in a non-tissue-specific accumulation of more free auxin at the rootshoot junction relative to WT. Over-expression of OsPIN2 enhanced auxin transport from shoots to roots, but did not alter the polar auxin pattern in the roots. Transgenic plants were less sensitive to N-1-naphthylphthalamic acid, an auxin transport inhibitor, than WT in their root growth. OsPIN2-over-expressing plants had suppressed the expression of a gravitropism-related gene OsLazy1 in the shoots, but unaltered expression of OsPIN1b and OsTAC1, which were reported as tiller angle controllers in rice. The data suggest that OsPIN2 has a distinct auxin-dependent regulation pathway together with OsPIN1b and OsTAC1 controlling rice shoot architecture. Altering OsPIN2 expression by genetic transformation can be directly used for modifying rice architecture.

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