A large increase in IAA during development of rice grains correlates with the expression of tryptophan aminotransferase OsTAR1 and a grain-specific YUCCA

Physiologia Plantarum
Yousef M Abu-ZaitoonHeather M Nonhebel

Abstract

The indole-3-acetic acid (IAA) content of developing grains of Oryza sativa subsp. japonica was measured by combined liquid chromatography, tandem mass spectrometry in multiple-reaction-monitoring mode. The increase from 50 ng g(-1) fresh weight to 2.9 µg g(-1) fresh weight from 1 to 14 days after pollination was much larger than that previously reported by enzyme-linked immunoassay methods. The largest increase in IAA content coincided with the start of the major starch deposition phase of grain-fill. The increase in IAA content was strongly correlated with the expression of putative IAA biosynthesis genes, OsYUC9, OsYUC11 and OsTAR1, measured by quantitative reverse transcriptase polymerase chain reaction. These results confirm the importance of the tryptophan aminotransferase/YUCCA pathway in this system. All three genes were expressed in endosperm; expression of OsYUC11 appeared to be confined to endosperm tissue. Phylogenetic analysis indicated that OsYUC11 and AtYUC10 belong to a separate clade of YUCCAs, which do not have orthologues outside the Angiosperms. This clade may have evolved with a specific role in endosperm. Expression of tryptophan decarboxylase in developing rice grains did not correlate with IAA levels, in...Continue Reading

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Citations

Jan 1, 2014·Plants·Sarah Russell FrenchHeather M Nonhebel
Dec 18, 2013·Physiologia Plantarum·Richard J PattisonCarmen Catalá
Jan 1, 2014·Journal of Integrative Plant Biology·Hong LiuKe Duan
Mar 25, 2014·The Plant Journal : for Cell and Molecular Biology·Takanori YoshikawaJun-Ichi Itoh
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Feb 25, 2021·Bioscience, Biotechnology, and Biochemistry·Mayu WatanabeYukihisa Shimada

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