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Effect of Salinity on Lignin and Hydroxycinnamic Acid Contents in Rice
Wi Seung Gon,Kim Jae-Sung,Kim Jin-Hong,Baek Myung Hwa,Yang Dae-Hwa,Lee Myung Chul,Chung Byung Yeoup The Korean Society of Crop Science 2004 Korean journal of crop science Vol.49 No.5
The lignin contents between IR-29 and Pokkali were not significantly different in the absence of NaCl, but they were slightly increased at 40 mM NaCl. Although lignin contents were not relatively significantly different between salt treated and control plants, the total yields of alkaline nitrobenzene oxidation ranged from 17.4-20.0 mg/g of cell wall residue at 40 mM NaCl were significantly different compared with control plants (11.8-12.2 mg/g). The total amounts of ester-linked hydroxycin-namic acids in IR-29 were decreased from 14.5 to 9.9mg/g, while Pokkali is almost same levels (14.9-15.0 mg/g) under treated and control with 40 mM NaCl. In contrast, the total amounts of ether-linked hydroxycinnamic acids were increased from 9.4 to 13.9 mg/g together with an opposite trend in Pokkali as a decrease 10.9 to 8.8 mg/g under treated and control with 40 mM NaCl. These results revealed that IR-29 is more sensitive in response to 40 mM NaCl in terms of hydroxycinnamic acids than Pokkali.
Wi, Seung Gon,Lee, Kwang Ho,Park, Byung Dae,Park, Young Goo,Kim, Yoon Soo 한국목재공학회 2004 목재공학 Vol.32 No.3
The present work was undertaken to investigate the anatomical and chemical characteristics of transgenic poplar down-regulated with antisense OMT gene. Also the distribution of lignin in transgenic poplar trees was investigated at cellular level. No nisible abnormal phenotype was observed in the fibers and vessel elements of transgenic poplar. Any marked differences in the staining intensitie of Wiesner and Maule color reaction were not identified in the transgenic poplar. TEM micrographs did not show any staining intensities in the cell walls stained with KMnO_(4). Interestingly, the UV spectroscopy of semi-thin sections exhibited a distinct decrease of lignin absorption at 280 nm in the vessel walls, indicating transgenic poplar wood with lower amount of guaiacyl lignin in vessel elements. Chemical composition of antisense OMT poplar was almost identical to that of wild-type poplar. Klason lignin content of transgenic poplar did not show any significant difference from that of the controls. The solid state NMR spectra revealed the transgenic poplar with only slightly more syringyl lignin that the control. The present work showed that antisense OMT gene constructed in the poplar was not enough to reduce the overall content of Klason lignin, and suggested that the expression of transformation was confined to vessel walls.