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Published on January 28, 2009; 10.1104/pp.108.131912

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Received October 30, 2008
Accepted January 23, 2009

The Low-Oxygen Induced NAC Domain Transcription Factor ANAC102 Affects Viability of Arabidopsis thaliana Seeds Following Low-Oxygen Treatment

Jed A. Christianson , Iain W. Wilson *, Danny J. Llewellyn , and Elizabeth S. Dennis

CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia

* Corresponding author; email: Iain.Wilson{at}csiro.au.

Low-oxygen stress imposed by field waterlogging is a serious impediment to plant germination and growth. Plants respond to waterlogging with a complex set of physiological responses regulated at the transcriptional, cellular and tissue levels. The Arabidopsis thaliana NAC domain containing gene ANAC102 was shown to be induced under 0.1% O2 within 30 minutes in both roots and shoots as well as in 0.1% O2 treated germinating seeds. Over-expression of ANAC102 altered the expression of a number of genes including many previously identified as being low-oxygen responsive. Decreasing ANAC102 expression had no effect on global gene transcription in plants, but did alter expression patterns in low-oxygen stressed seeds. Increasing or decreasing the expression of ANAC102 did not affect adult plant survival of low-oxygen stress. Decreased ANAC102 expression significantly decreased germination efficiency following a 0.1% O2 treatment, but increased expression had no effect on germination. This protective role during germination appeared to be specific to low-oxygen stress, implicating ANAC102 as an important regulator of seed germination under flooding.




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