Biologia plantarum 46:73-78, 2003 | DOI: 10.1023/A:1022362117395

The Effect of Polyethylene Glycol on Proline Accumulation in Rice Leaves

S.Y. Hsu1, Y.T. Hsu1, C.H. Kao1
1 Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China

The regulation of proline accumulation in polyethylene glycol (PEG, -1.5 MPa) treated rice leaves was investigated. PEG treatment resulted in a decrease in relative water content, indicating that PEG treatment caused water stress in rice leaves. Proline accumulation caused by PEG was related to protein hydrolysis, an increase in ornithine-δ-amino- transferase activity, an increase in the content of ammonia, and an increase in the contents of the precursors of proline biosynthesis, glutamic acid, ornithine, and arginine. Results also show that abscisic acid accumulation is not required for proline accumulation in PEG-treated rice leaves.

Keywords: abscisic acid; arginine; glutamic acid; ornithine; ornithine-δ-aminotransferase; Oryza sativa; relative water content; water stress
Subjects: abscisic acid (ABA); amino acids; arginine; glutamic acid; ornithine, ornithine-δ-aminotransferase; Oryza sativa; polyethylene glycol; proline biosynthesis and accumulation, water stress, polyethylene glycol; relative water content; water stress, proline accumulation

Prepublished online: March 1, 2003; Published: July 1, 2003Show citation

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Hsu, S.Y., Hsu, Y.T., & Kao, C.H. (2003). The Effect of Polyethylene Glycol on Proline Accumulation in Rice Leaves. Biologia plantarum, 46(1), 73-78. doi: 10.1023/A:1022362117395.
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