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Molecular Cloning and Differential Expression of Cytosolic Class I Small Hsp Gene Family in Pennisetum glaucum (L.)

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Abstract

Small heat shock protein (Hsp) family genes have been reported in several plant species that function as molecular chaperones to protect proteins from being denatured in extreme conditions. As a first step towards the isolation and characterization of genes that contribute to combating abiotic stresses particularly heat stress, construction and screening of the subtracted complementary DNA (cDNA) library is reported here. In this study, a subtractive heat stress cDNA library was constructed that was used to isolate members of small Hsps (sHsps) using PgsHsp17.9A gene as a probe. As a result, a total of 150 cDNA clones were isolated from the subtracted cDNA library screening, leading to 121 high-quality expressed sequence tags (ESTs), with an average size of 450 bp, comprising of 15 contigs, and majority of these isolated sHsp genes belong to cytosolic class I (CI) family. In silico sequence analysis of CI-sHsp family genes revealed that the length of sHsp proteins varied from 151 to 159 amino acids and showed large variation in isoelectric point value (5.03 to 10.05) and a narrow range of molecular weight (16.09 to 17.94 kDa). The real-time PCR results demonstrated that CI-sHsp genes are differentially expressed in Pennisetum leaves under different abiotic stress conditions particularly at high temperature. The results presented in this study provide basic information on PgCI-sHsp family genes and form the foundation for future functional studies of these genes.

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Abbreviations

sHsp:

Small heat shock protein

ACD:

Alpha crystallin domain

Pg:

Pennisetum glaucum

CI:

Cytosolic class I

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Acknowledgments

We thank Prof. Kavi Kishor for critical reading of the manuscript. This work was supported in part by a research grant from the Department of Biotechnology (Ministry of Science and Technology, Government of India) to MKR. PSR acknowledges the Department of Science and Technology, Govt. of India, New Delhi, for financial support through the INSPIRE Faculty Fellowship Award Grant No. IFA-LSPA-06. This work was undertaken as part of the CGIAR Research Program on Dryland Cereals.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502324, Telangana, India

    Palakolanu Sudhakar Reddy, Kiran K. Sharma & Vincent Vadez

  2. Plant Molecular Biology Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, 110 067, India

    Palakolanu Sudhakar Reddy & Malireddy K. Reddy

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  1. Palakolanu Sudhakar Reddy
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Correspondence to Palakolanu Sudhakar Reddy.

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Reddy, P.S., Sharma, K.K., Vadez, V. et al. Molecular Cloning and Differential Expression of Cytosolic Class I Small Hsp Gene Family in Pennisetum glaucum (L.). Appl Biochem Biotechnol 176, 598–612 (2015). https://doi.org/10.1007/s12010-015-1598-y

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