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Transcriptome analysis of differentially expressed genes during embryosac development in apomeiotic non parthenogenetic interspecific hybrid of Pennisetum glaucum

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Title Transcriptome analysis of differentially expressed genes during embryosac development in apomeiotic non parthenogenetic interspecific hybrid of Pennisetum glaucum
 
Creator Sahu, Pranav Pankaj
Gupta, Sarika
Malaviya, D. R.
Roy, Ajoy Kumar
Kaushal, Pankaj
Prasad, Manoj
 
Subject Apomeiosis
Apomixis
Interspecific hybrids
Pennisetum
Quantitative real-time PCR
Suppression subtractive hybridization
 
Description Apomixis results in the production of genetically uniform progeny, derived from the fertilization independent development (parthenogenesis) of an unreduced egg cell (apomeiosis). To identify genes involved in the apomeiosis, a comparative transcriptome analysis of differentially expressed genes during embryo sac (ES) development in a sexual Pennisetum glaucum (genotype 81A1) and its apomeiotic (aposporic) non-parthenogenetic interspecific hybrid (BC1GO) was investigated. BC1GO exhibited the partitioned apomeiosis component, whereby the second apomixis component viz., parthenogenesis was completely lacking. A total of 96 non-redundant transcripts were recovered using suppression subtractive hybridization and classified into 11 different categories according to their putative functions. Amongst the identified transcripts, many of them belonged to unknown function (40%) followed by those involved in protein metabolism, stress response, pollen/ovule/embryo development, and translation/protein modification process. A data search of transcriptional profiling in other apomictic species revealed that 75% of the differentially expressed transcripts have not been reported in previous studies. By macroarray analysis, we identified differential expression pattern of 96 transcripts, 45 (47%) of which showed ≥2-fold induction in apomeiotic BC1GO. Further, the obtained results were validated by quantitative real-time polymerase chain reaction to have a comparative expression profiling of eight selected up-regulated transcripts (≥2.5-fold) between BC1GO and 81A1 at different phases of ovule development. In silico mapping demonstrated that 13 transcripts were located onto rice chromosome 2, region syntenic with the apospory locus as reported in Brachiaria brizantha and Paspalum notatum. The expression patterns of these transcripts showed a significant difference at differentiating megaspore mother cell and gametogenesis stages thereby suggesting their involvement in floral development during apomeiotic (Panicum-type aposporous) ES development.
The authors gratefully thank the Director,
National Institute of Plant Genome Research, Director, Indian
Grassland and Fodder Research Institute, Jhansi, and Director,
Central Rice Research Institute, Cuttack India for providing facilities.
The authors gratefully acknowledge the financial support from the
Department of Biotechnology, Government of India. The authors
would also like to thank both the reviewers for their constructive
comments.
 
Date 2015-10-28T11:22:18Z
2015-10-28T11:22:18Z
2012
 
Type Article
 
Identifier Mol. Biotechnol., 51(3): 262-271
1559-0305
http://link.springer.com/article/10.1007%2Fs12033-011-9464-9
http://172.16.0.77:8080/jspui/handle/123456789/276
 
Language en_US
 
Publisher Springer