Expression of pigeonpea hybrid-proline-rich protein encoding gene (CcHyPRP) in yeast and Arabidopsis affords multiple abiotic stress tolerance.

Abstract:

:A hybrid-proline-rich protein encoding gene (CcHyPRP) has been isolated and characterized, for the first time, from the subtracted cDNA library of pigeonpea (Cajanus cajan L.) plants subjected to drought stress. Functionality of CcHyPRP has been validated for abiotic stress tolerance using the heterologous yeast and Arabidopsis systems. The CcHyPRP contained a repetitive proline-rich (PR) N-terminal domain and a conserved eight cysteine motif (8CM) at the C-terminus. Southern analysis disclosed single-copy nature of CcHyPRP gene in the pigeonpea genome. Northern analysis revealed higher levels of CcHyPRP transcripts in PEG, NaCl, heat (42 degrees C), cold and ABA-treated plants compared with the weak signals observed in the untreated plants, suggesting stress-responsive nature of the CcHyPRP gene. In yeast, expression of CcHyPRP imparted marked tolerance against abiotic stresses exerted by PEG, high temperature, NaCl and LiCl. Transgenic Arabidopsis lines, expressing CcHyPRP under the control of CaMV35S and rd29A promoters, when subjected to PEG, mannitol, NaCl, LiCl and heat (42 degrees C) stress, developed into healthy plants with profuse root system and increased biomass in contrast to the weak-stunted wild-type plants. The CcHyPRP-transgenics driven by stress-inducible rd29A exhibited similar stress-tolerance as that of CaMV35S-lines without any negative effects on plant morphology, implying that stress-inducible promoters are preferable for production of stress tolerant transgenics. The overall results amply demonstrate the profound effect of CcHyPRP in bestowing multiple abiotic stress tolerance at cellular and whole plant levels. Accordingly, the multipotent CcHyPRP seems promising as a prime candidate gene to fortify crop plants with abiotic stress tolerance.

journal_name

Plant Biotechnol J

authors

Priyanka B,Sekhar K,Reddy VD,Rao KV

doi

10.1111/j.1467-7652.2009.00467.x

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

76-87

issue

1

eissn

1467-7644

issn

1467-7652

pii

PBI467

journal_volume

8

pub_type

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