4 years ago

Genome-wide Identification of Medicago Peptides involved in Macronutrient Responses and Nodulation.

Xinbin Dai, Clarissa Boschiero, Vijaykumar Veerappan, Ivone Torres-Jerez, Joaquina Nogales, Thomas de Bang, Wolf Scheible, Pooja Pant, Sonali Roy, Rebecca Dickstein, Zhaohong Zhuang, Peter Knut Lundquist, Patrick Xuechun Zhao, Michael K Udvardi
Growing evidence indicates that small, secreted peptides (SSPs) play critical roles in legume growth and development, yet annotation of SSP-coding genes is far from complete. Systematic re-annotation of the Medicago truncatula genome identified 1,970 homologs of established SSP gene families and an additional 2,455 potential SSP genes. Expression patterns of known and putative SSP genes based on 144 RNA-seq datasets covering various stages of macronutrient deficiencies and symbiotic interactions with rhizobium and mycorrhiza were investigated. Focusing on those known or suspected to act via receptor-mediated signaling, 240 nutrient-responsive and 365 nodulation-responsive signaling-SSPs were identified, greatly expanding the number of SSP gene families potentially involved in acclimation to nutrient deficiencies and nodulation. Synthetic peptide applications were shown to alter root growth and nodulation phenotypes, revealing additional regulators of legume nutrient acquisition. Our results constitute a powerful resource enabling further investigations of specific SSP functions via peptide treatment and reverse genetics.

Publisher URL: http://doi.org/10.1104/pp.17.01096

DOI: 10.1104/pp.17.01096

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