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Characteristics of senescent straw cell walls of dwarf, semidwarf, and normal strains of rice (Oryza sativa) plants


A normal variety of rice (Oryza sativa Taichung 65, T65c), its isogenic dwarf line (T65d 1), and a semidwarf variety of a different line (Oryza sativa IR8, IR8) were studied. The results were compared with those of an isogenic dwarf line (Rh i) of wheat straw, which was previously reported. Expression of the dwarf gene,d 1, on the chemical composition and the structural features of lignin present in rice internodes differs from that in an isogenic dwarf line of wheat. The differences include the lignin content, total yield of alkaline nitrobenzene oxidation products, and distribution of wall-bound hydroxycinnamic acids. There was, however, no difference in the syringyl/ guaiacyl nuclei (S/V) molar ratio and neutral sugar composition. The lignin composition of rice straw cell walls, particularly that of the dwarf variety, contained more of the condensed structure and fewer syringyl nuclei than lignin in wheat straw cell walls. It is suggested that crosslinking between lignin and polysaccharides by ester-ether bridges via ferulic acid contributes to the mechanical properties of the cell walls of rice straw. Thus the chemical and structural characteristics of lignin in rice straw differ to some extent from those of other temperate grasses, such as wheat (Triticum aestivum) and phalaris (Phalaris aquatica), as reported previously. This can probably be attributed to the water environment of rapidly growing rice seedlings, but it also depends on the genetic variety of the rice plant.


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Correspondence to Kenji Iiyama.

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Lam, T.B.T., Iiyama, K. Characteristics of senescent straw cell walls of dwarf, semidwarf, and normal strains of rice (Oryza sativa) plants. J Wood Sci 46, 376–380 (2000).

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Key words

  • Hydroxycinnamic acids
  • Oryza sativa L.
  • Isogenic dwarf line
  • Lignin
  • Partially methylated alditol acetate