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http://dx.doi.org/10.5660/KJWS.2011.31.2.134

Relationship of Fitness and Substance of Porphyrin Biosynthesis Pathway in Resistant Transgenic Rice to Protoporphyrinogen Oxidase (Protox) Inhibitor  

Yun, Young-Beom (Department of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Kwon, Oh-Do (Jeonnam Agricultural Research and Extension Service)
Back, Kyoung-Whan (Major in Molecular Biotechnology, College of Agriculture and Life Sciences, Chonnam National University)
Lee, Do-Jin (Department of Agricultural Education, Sunchon National University)
Jung, Ha-Il (Department of Crop and Soil Sciences, Cornell University)
Kuk, Yong-In (Department of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Publication Information
Korean Journal of Weed Science / v.31, no.2, 2011 , pp. 134-145 More about this Journal
Abstract
The objectives of this study were to investigate fitness difference in growth and rice yield in herbicide-transgenic rice overexpressing Myxococcus xanthus and Arabidopsis thaliana protoporphyrinogen oxidase (Protox) genes and non-transgenic rice. We also aimed to determine whether these fitness differences are related to ALA synthesizing capacity, accumulation of terapyrroles, reactive oxygen species, lipid peroxidation, and antioxidative enzymes at different growth stages of rice. Plant height of the transgenic rice overexpressing M. xanthus (MX) and A. thaliana (AP37) Protox genes at 43, 50, and 65 days after transplanting (DAT) was significantly lower than that of WT. Number of tiller of PX as well as MX and AP37 at 50 and 65 DAT was significantly lower than that of WT. At harvest time, culm length and yield of MX, PX and AP37 and rice straw weight of MX and AP37 were significantly low compared with WT. The reduction of yield in MX, PX, and AP37 was caused by spikelets per panicle and 1000 grain weight, ripened grain, spikelets per panicle, 1000 grain weight, and ripened grain, respectively. On the other hand, 135 the reduction of yield in MX, PX, and AP37 was also observed in another yearly variation experiment. The reduction of rice growth in MX, PX, and AP37 was observed in seedling stage as well as growth duration in field. There were no differences in tetrapyrrole intermediate Proto IX, Mg-Proto IX and Mg-Proto IX monomethyl ester, reactive oxygen species ($H_2O_2$ and ${O_2}^-$), MDA, antioxidative enzymes (SOD, CAT, POX, APX, and GR) and chlorophyll between transgenic lines and wild type, indicating that accumulated tetrapyrrole intermediate and other parameters were not related to growth reduction in transgenic rice. However, ALA synthesizing capacity in MX, PX, and AP37 at one day after exposure to light and 52 DAT was significantly lower than that of WT. Further study is required to elucidate the mechanisms underlying the growth and yield difference between transgenic and WT lines.
Keywords
itness; porhyrin biosynthesis; protox inhibitor; transgenic rice;
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