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Auxin redistribution and shifts in PIN gene expression during Arabidopsis grafting

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Abstract

Auxin is important in the development of plant vascular tissues. Reconnection of vascular bundles between scion and stock is a primary aim of grafting, and polar auxin transport greatly affects the formation of a continuous vascular model. The role of auxin in the process of graft-union development was studied by grafting the seedlings of Arabidopsis thaliana (L.) Heynh. DR5:GUS marker plants, which exert the auxinspecific responses. Auxin induced the DR5:GUS expression in the vascular bundles around graft surface and stimulated the formation of multiple vascular bundle reconnections on the third day after grafting (DAG). DR5:GUS expression was delayed for one day in both scion and stock and dramatically declined by the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). Vascular bundle reconnection was observed only on the 4th DAG. These results suggest that auxin stimulates the reconnection of the vascular bundles, whereas NPA inhibits it. We studied the role of PIN proteins in graft development by grafting seedlings of PIN:GUS plants. PIN had different expression patterns in the graft process. Expression levels of PIN genes were analyzed by real-time PCR. All PIN genes had the higher expression level at the third DAG. We conclude that auxin stimulates the development of graft unions, and the patterns of expressions of PIN family genes can affect the development of graft-union by controlling the auxin flow.

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Abbreviations

DAG:

day(s) after grafting

NPA:

N-1-naphthylphthalamic acid

WT:

wild-type

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Authors and Affiliations

  1. Institute of Cell Biology, School of Life Science, Lanzhou University, Lanzhou, 730000, P.R. China

    J. Wang, Z. Jin, H. Yin, B. Yan, Z. Z. Ren, J. Xu, C. J. Mu & H. Liu

  2. Lanzhou Institute of Biological Products, Lanzhou, P.R. China

    Y. Zhang & M. Q. Wang

Authors
  1. J. Wang
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  2. Z. Jin
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  3. H. Yin
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  4. B. Yan
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  5. Z. Z. Ren
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  6. J. Xu
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  7. C. J. Mu
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  10. H. Liu
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Correspondence to J. Wang.

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This text was submitted by the authors in English.

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Wang, J., Jin, Z., Yin, H. et al. Auxin redistribution and shifts in PIN gene expression during Arabidopsis grafting. Russ J Plant Physiol 61, 688–696 (2014). https://doi.org/10.1134/S102144371405015X

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  • DOI: https://doi.org/10.1134/S102144371405015X

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