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

Content Provider	Springer Nature Link
Author	Corti Monzón, Georgina Pinedo, Marcela Lamattina, Lorenzo Canal, Laura
Copyright Year	2011
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.
Starting Page	129
Ending Page	136
Page Count	8
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	66
Issue Number	2
e-ISSN	15735087
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-11-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Auxin Helianthus annuus Jasmonic acid Lateral root root Agriculture Plant Anatomy/Development Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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