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Sunflower root growth regulation: the role of jasmonic acid and its relation with auxins

Plant Growth Regulation volume 66, pages 129–136 (2012)Cite this article

Abstract

Jasmonates are lipid-derived hormones that act as signal molecules in abiotic and biotic stresses and influence several aspects of plant growth and development. In this work we have investigated the effect of jasmonic acid (JA) on the root architecture of Helianthus annuus seedlings and if JA and auxins interact to modulate the growth of the primary root (PR) and lateral roots (LR). The addition of μM concentrations of JA to the growing medium of sunflower seedlings decreased the growth of the PR and LR, and also reduced the number of LR. Moreover, treatment with ibuprofen, an inhibitor of JA synthesis, increased PR and LR root length causing a deep effect on root architecture. Hence, not only exogenous but also the endogenous JA regulates sunflower root growth. Microscopic analysis showed that the application of JA reduces the cortex cell length and the estimated cell production rate in root meristem while ibuprofen only affects the cell elongation. A possible interaction between JA and auxins to regulate root growth was further analyzed. We show that JA produced its phenotype even in the presence of reduced levels of auxin generated by treatment with an auxin transport inhibitor. Besides, the auxin produced its phenotype even when ibuprofen was applied. In conclusion, JA may induce primary and lateral root growth inhibition in sunflower by an auxin-independent pathway.

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Abbreviations

IBU:

Ibuprofen

JA:

Jasmonic acid

LR:

Lateral roots

NAA:

1-Naphthylacetic acid

NPA:

N-1-Naphthylphthalamic acid

PCBI:

p-chlorophenoxyisobutyric acid

PR:

Primary root

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Acknowledgments

GCM is a fellow, and LL, LDLC are members of the research career from the Argentine Research Council (CONICET). We thank S. Alemano and G. Abdala (University of Rio Cuarto, Argentina) for valuable suggestions. This work was supported by the ANPCYT (PAE-PICT N° 0016) and the University of Mar del Plata, Argentina.

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  1. Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata—CONICET, Funes 3250, 7600, Mar del Plata, Argentina

    Georgina Corti Monzón, Marcela Pinedo, Lorenzo Lamattina & Laura de la Canal

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  1. Georgina Corti Monzón
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  2. Marcela Pinedo
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  3. Lorenzo Lamattina
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  4. Laura de la Canal
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Correspondence to Georgina Corti Monzón.

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Corti Monzón, G., Pinedo, M., Lamattina, L. et al. Sunflower root growth regulation: the role of jasmonic acid and its relation with auxins. Plant Growth Regul 66, 129–136 (2012). https://doi.org/10.1007/s10725-011-9636-4

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  • DOI: https://doi.org/10.1007/s10725-011-9636-4

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