Journal
PLANT SIGNALING & BEHAVIOR
Volume 7, Issue 7, Pages 746-748Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.20407
Keywords
symbiotic nitrogen fixation; shade avoidance syndrome; phytochrome; R/FR ratio; root nodule; nodulation; jasmonic acid
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Funding
- Japan Society for the Promotion of Science [21657017]
- Kato Memorial Bioscience Foundation
- Grants-in-Aid for Scientific Research [21380016] Funding Source: KAKEN
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Light is critical for supplying carbon for use in the energetically expensive process of nitrogen-fixing symbiosis between legumes and rhizobia. We recently showed that root nodule formation in phyB mutants [which have a constitutive shade avoidance syndrome (SAS) phenotype] was suppressed in white light, and that nodulation in wild-type is controlled by sensing the R/FR ratio through jasmonic acid (JA)signaling. We concluded that the cause of reduced root nodule formation in phyB mutants was the inhibition of JA-Ile production in root. Here we show that the shoot JA-Ile level of phyB mutants is higher than that of the wild-type strain MG20, suggesting that translocation of JA-Ile from shoot to root is impeded in the mutant. These results indicate that root nodule formation in phyB mutants is suppressed both by decreased JA-Ile production, caused by reduced JAR1 activity in root, and by reduced JA-Ile translocation from shoot to root.
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