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A novel mutant with modified tropic responses in Pisum sativum L.

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Abstract

A single-gene recessive mutant which displays increased phototropic and gravitropic responses has been isolated in Pisum sativum L. cv. Torsdag and is provisionally named mtr-1, for its modified tropic response. Mutant plants attain a greater degree of bending during both phototropic and gravitropic induction due to an extension of the curvature phase. In addition to their increase in tropic curvature, mutant plants have longer and narrower leaves as mature plants, attenuated blue-light-induced ion flux responses, and lower levels of PsPK5 mRNA (a PHOT1 orthologue). Possible causes of these effects are discussed.

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Fig. 1a–c
Fig. 2a–e
Fig. 3 a,b
Fig. 4a,b
Fig. 5a,b
Fig. 6a–d

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Abbreviations

PsPK :

Pisum sativum protein kinase

mtr :

Modified tropic response

nph :

Non-phototropic hypocotyl

phot :

Phototropin

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Acknowledgements

We thank Ian Cummings, Tracey Winterbottom and Leigh Johnson for technical assistance, and an anonymous reviewer for helpful comments. This work was supported by an APA scholarship to J.D.P. and an ARC grant to J.B.R.

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Authors and Affiliations

  1. School of Plant Science, University of Tasmania, Private Bag 55, 7001, Hobart, Tasmania, Australia

    J. Damien Platten, Robert C. Elliott & James B. Reid

  2. School of Agricultural Science, University of Tasmania, Private Bag 54, 7001, Hobart, Tasmania, Australia

    Sergey N. Shabala

Authors
  1. J. Damien Platten
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  2. Sergey N. Shabala
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  3. Robert C. Elliott
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  4. James B. Reid
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Correspondence to J. Damien Platten.

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Platten, J.D., Shabala, S.N., Elliott, R.C. et al. A novel mutant with modified tropic responses in Pisum sativum L.. Planta 220, 222–229 (2004). https://doi.org/10.1007/s00425-004-1339-x

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  • DOI: https://doi.org/10.1007/s00425-004-1339-x

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