Stress-induced synthesis of proline confers tolerance to water deficit in transgenic wheat

Water deficit is one of the main abiotic factors that affect spring wheat planted in subtropical regions. Accumulation of proline appears to be a promising approach to maintain the productivity of plants under stress condition. However, morphological alterations and growth reduction are observed in...

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Bibliographic Details
Published in:Journal of plant physiology 2007-10, Vol.164 (10), p.1367-1376
Main Authors: Vendruscolo, Eliane Cristina Gruszka, Schuster, Ivan, Pileggi, Marcos, Scapim, Carlos Alberto, Molinari, Hugo Bruno Correa, Marur, Celso Jamil, Vieira, Luiz Gonzaga Esteves
Format: Article
Language:English
Subjects:
abscisic acid-inducible promoter complex
Biological and medical sciences
delta 1-pyrroline-5-carboxylate synthetase
drought
Drought tolerance
Fundamental and applied biological sciences. Psychology
gene expression regulation
Gene Expression Regulation, Plant
P5CS
Plant physiology and development
plant stress
Plants, Genetically Modified
Proline
Proline - biosynthesis
Time Factors
Transformation
transgenic plants
Triticum - embryology
Triticum - genetics
Triticum - metabolism
Triticum aestivum
Vigna
Water - metabolism
Water and solutes. Absorption, translocation and permeability
water stress
Wheat
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Summary:Water deficit is one of the main abiotic factors that affect spring wheat planted in subtropical regions. Accumulation of proline appears to be a promising approach to maintain the productivity of plants under stress condition. However, morphological alterations and growth reduction are observed in transgenic plants carrying genes coding for osmoprotectants controlled by constitutive promoters. We report here the effects of water deficit on wheat plants transformed with the Vigna aconitifolia Δ 1-pyrroline-5-carboxylate synthetase ( P5CS) cDNA that encodes the key regulatory enzyme in proline biosynthesis, under the control of a stress-induced promoter complex—AIPC. Transgenic wheat plants submitted to 15 days of water shortage presented a distinct response. We have found that drought resulted in the accumulation of proline. The tolerance to water deficit observed in transgenic plants was mainly due to protection mechanisms against oxidative stress and not caused by osmotic adjustment.
ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2007.05.001