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New perspectives into jasmonate roles in maize.

Yuanxin Yan1, Pei-Cheng Huang, Eli Borrego

  • 1a Department of Plant Pathology and Microbiology ; Texas A&M University ; College Station , TX USA.

Plant Signaling & Behavior
|December 9, 2014
PubMed
Summary

Jasmonates (JAs) are crucial plant hormones regulating defense and development in maize. This study reveals new roles for JAs in plant growth, including sheath, leaf, and root elongation, and seedling photomorphogenesis.

Keywords:
JAs, jasmonatesMeJA, methyl jasmonateOPDA, 12-oxo-phytodienoic acidOPR, 12-oxo-phytodienoate reductasePythiumjasmonate biosynthesismaizetasselseeds

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Area of Science:

  • Plant Biology
  • Hormone Signaling
  • Agriculture

Background:

  • Jasmonates (JAs) are vital defense hormones in plants like Arabidopsis and tomato, mediating responses to biotic and abiotic stresses.
  • JAs also regulate critical developmental processes, including reproduction, senescence, and root growth.
  • Understanding JA functions in monocots, such as maize, is crucial due to their agricultural importance.

Purpose of the Study:

  • To comprehensively investigate the multifaceted roles of jasmonates (JAs) in the monocotyledonous model plant, maize.
  • To expand upon previous findings by examining JA's involvement in plant growth and photomorphogenesis.

Main Methods:

  • Analysis of a JA-deficient maize double mutant lacking functional OPR7 and OPR8 genes, essential for JA biosynthesis.
  • Comparative studies to assess the impact of JA deficiency on various growth and developmental parameters.

Main Results:

  • The JA-deficient maize mutant exhibited defects in sheath, leaf, and root elongation.
  • Jasmonates were found to be involved in the photomorphogenesis of maize seedlings.
  • Previous findings on reproductive development, pigmentation, senescence, and defense were corroborated.

Conclusions:

  • Jasmonates play essential roles in regulating plant architecture and development in maize, extending beyond defense mechanisms.
  • This research highlights the conserved and divergent functions of JAs in monocots compared to dicots.
  • Further elucidation of JA signaling pathways in crops can inform agricultural strategies.