Functional characterisation of OsAMT1.1 overexpression lines of rice, Oryza sativa
Date
2006
Authors
Kumar, A.
Kaiser, B.
Siddiqi, M.
Glass, A.
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Advisors
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Volume Title
Type:
Journal article
Citation
Functional Plant Biology, 2006; 33(4):339-346
Statement of Responsibility
Anshuman Kumar, Brent N. Kaiser, M. Yaeesh Siddiqi and Anthony D. M. Glass
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DOI
Abstract
In rice (Oryza sativa L.) OsAMT1.1 is the most active and / or most N-responsive gene responsible for high-affinity NH₄⁺ transport (HATS) activity. We measured ¹³NH₄⁺ influx and plant biomass in transgenic overexpression lines and two wild type cultivars of rice, Jarrah and Taipei, with one or more copies of OsAMT1.1. ¹³NH₄⁺ influx was higher for the overexpression lines of Jarrah line when grown at 10 µM external NH₄⁺ concentration, but not for the overexpression lines of Taipei. For seedlings grown at 2 mM external NH₄⁺ concentration Jarrah lines 77-1 and 75-4 showed an increased influx; however, two overexpression lines of Taipei showed reduced influx rates. The biomasses of the transgenic lines grown at low and high external NH₄⁺ concentrations were either reduced or showed no statistically significant differences compared with wild type lines. While ¹³NH₄⁺ influx into roots of Jarrah line 75-4 grown at 10 µM external NH₄⁺ concentration was significantly higher than in wild type, measurements of ¹³NH efflux revealed no differences, and thus net uptake of NH₄⁺ was higher in this overexpression line.