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http://dx.doi.org/10.5010/JPB.2007.34.1.061

Characterization of Salt Tolerant Rice Mutant Lines Derived from Azetidine-2-Carboxylic Acid Resistant Cell Lines Induced by Gamma Ray Irradiation  

Song, Jae-Young (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Kim, Dong-Sub (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Lee, Geung-Joo (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Lee, In-Sok (Agricultural Technology Center)
Kang, Kwon-Kyoo (College of Agriculture and Life Science, Hankyong National University)
Yun, Song-Joong (Chonbuk National University)
Kang, Si-Yong (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Publication Information
Journal of Plant Biotechnology / v.34, no.1, 2007 , pp. 61-68 More about this Journal
Abstract
To develop rice (Oryza sativa L.) cultivars to be planted on salt-affected sites, cell lines with enhanced proline content and resistance to growth inhibition by Azetidine-2-carboxylic acid (AZCA), a proline analogue, were screened out among calli irradiated with gamma ray of 50, 70, 90, and 120 Gy. The calli had been derived from embryo culture of the cultivar Donganbyeo. Selected AZCA resistant lines that had high proline accumulation were used as sources for selection of NaCl resistant lines. To determine an optimum concentration for selection of NaCl resistant lines, Donganbyeo seeds were initially cultured on the media containing various NaCl concentrations (0 to 2.5%) for 40 days, and 1.5% NaCl concentration was determined as the optimum concentration. One hundred sixteen salt-tolerant (ST) lines were selected from bulked 20,000 seeds of the AZCA resistant $M_{3}$ seeds in the medium containing 1.5% NaCl. The putative 33 lines ($M_{4}$ generation) considered with salt-tolerance were further analyzed for salt tolerance, amino acid and ion contents, and expression patterns of the salt tolerance-related genes. Out of the 33 lines, 7 lines were confirmed to have superior salt tolerance. Based on growth comparison of the entries, the selected mutant lines exhibited greater shoot length with average 1.5 times, root length with 1.3 times, root numbers with 1.1 times, and fresh weight with 1.5 times than control. Proline contents were increased maximum 20%, 100% and 20% in the leaf, seed and callus, respectively, of the selected lines. Compared to control, amino acid contents of the mutants were 24 to 29%, 49 to 143%, 32 to 60% higher in the leaf, seed and callus, respectively. The ratio of $Na^{+}/K^{+}$ for most of the ST-lines were lower than that of control, ranging from 1.0 to 3.8 for the leaf and 11.5 to 28.5 for the root, while the control had 3.5 and 32.9 in the leaf and root, respectively. The transcription patterns for the P5CS and NHXI genes observed by RT-PCR analysis indicated that these genes were actively expressed under salt stress. The selected mutants will be useful for the development of rice cultivar resistant to salt stress.
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