Indian Society of Genetics & Plant Breeding


Genome-wide identification and characterization of Xylanase Inhibitor Protein (XIP) genes in cereals

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Xylanase inhibitor proteins (XIPs) have been reported to be
involved in plant defense mechanisms, more predominantly
against fungal pathogens. XIPs have mostly been well
characterized in model plant species, and very little is known
about their distribution, organization and evolution in
cereals. In the present study, we have identified XIPs in
four cereal plant species, including three major crops
sorghum, maize, rice and a model species Brachypodium.
The genome-wide analysis identified 10, 20, 13 and 31 XIP
genes respectively for Brachypodium, sorghum, maize and
rice. The number of identified genes is in well accordance
with the genome size except for maize. Interestingly, most
of the XIP genes were observed to be intron-less, and
clustered together on the chromosomes. The XIP genes
organization is much similar to the lower eukaryotes and
fungi suggesting the possibility of horizontal gene transfer
from the pathogen. The phylogenetic analysis of XIP
revealed two major groups, and minor subgroups mostly
representing gene clusters. Gene expression evaluation
using publically available data suggested LOC_Os11g47500
and LOC_Os11g47510are candidate genes for resistance
against Magnaporthe grisea pathogen in rice. The
information provided here would be helpful for the
identification of candidate resistance genes in other cereals.

Keywords: Xylanase inhibitor proteins, resistance genes, genome-wide analysis, gene family, gene clusters, fungal diseases


Year: 2016
Volume: 76
Issue: 2
Article DOI: 10.5958/0975-6906.2016.00036.5
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Shaila Chavan info_circle
Jawaharlal Katara info_circle
Juhi Chaudhary info_circle
Suhas Kadam info_circle
Gunvant Patil info_circle
Rupesh Deshmukh info_circle

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