Dry matter and lignin distributions in maize (Zea mays L.) internodes
2002
Kawamura, O. (Miyazaki Univ. (Japan). Faculty of Agriculture) | Niijima, N. | Niimi, M. | Akashi, R.
The second, fifth and eighth internode, counting stemupward, collected from heading, milk-ripe and full-ripe maize (Zea mays L.), were micro-surgically dissected into fractions of epidermis (EPI), sclerenchyma (SCL), vascular bundle (VB) and pith parenchyma (PITH). Of the total internode tissues, the dry weight of the VB fraction was the lowest, followed by EPI, SCL and PITH. These values did not coincide with the size of the respective areas occupied by the different tissue fractions in cross-sections of the internodes. The lignin concentration was in the following order : EPI>SCL>VB>PITH. Moving stemupward, the lignin concentration increased in PITH but decreased in EPI and SCL, and was relatively stable in VB. The proportion of lignin content in VB tissues to total lignin of the internodes was the lowest at 9-14%, and varied from 24 to 35% for EPI, from 18 to 48% for SCL and from 12 to 44% for PITH. The higher the internode was situated the smaller was the proportion of lignin found in SCL and the greater in PITH.
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