Abstract
Proline (Pro) accumulation under water stress was measured in safflower (Carthamus tinctorius L.) drought tolerant cv. A1 and sensitive cv. Nira. Activities of pyrroline-5-carboxylate reductase (P5C reductase) and pyrroline-5-carboxylate synthetase (P5C synthetase), two enzymes involved in the Pro biosynthetic pathway were also estimated. Water stress resulted in a reduction in the leaf dry mass and chlorophyll content along with a gradual accumulation of Pro. RT-PCR results show higher expression of Δ1-pyrroline-5-carboxylate synthetase (p5cs) gene in correlation with up-regulated Pro accumulation in cv. A1. P5C reductase was found to be the Pro synthesis rate limiting whereas P5C synthetase did not show any specific response to the drought stress in both cultivars.
Abbreviations
- p5cs :
-
pyrroline-5-carboxylate synthetase gene
- P5C reductase:
-
pyrroline-5-carboxylate reductase
- P5C synthetase:
-
pyrroline-5-carboxylate synthetase
- Pro:
-
proline
- RT-PCR:
-
reverse transcriptase polymerase chain reaction
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Acknowledgements
This study was conducted as part of the “Biotechnology for Dry Land Agriculture in Andhra Pradesh“ programme with the financial support from the Research and Communication Division, Ministry of Foreign Affairs, The Government of Netherlands, through APNL-BTU, Hyderabad.
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Thippeswamy, M., Chandraobulreddy, P., Sinilal, B. et al. Proline accumulation and the expression of Δ1-pyrroline-5-carboxylate synthetase in two safflower cultivars. Biol Plant 54, 386–390 (2010). https://doi.org/10.1007/s10535-010-0070-7
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DOI: https://doi.org/10.1007/s10535-010-0070-7