A quantitative analysis of lignin distribution in the internodes by micro-surgical tissue separation in sorghum (Sorghum bicolor Moench) and maize (Zea mays L.)
1996
Kawamura, O. (Miyazaki Univ. (Japan). Faculty of Agriculture) | Niijima, N.
Internodes of sorghum and maize plants were microsurgically dissected into fractions of epidermis (EPI), sclerenchyma (SCL), vascular bundle (VB) and pith parenchyma (PITH) to examine the lignin distribution. The second lowest internode of both plants dissected at the heading and milk-ripe growth stages had the highest lignin concentration in the EPI and SCL followed by the VB, and the PITH had the least lignin concentration. Although lignin concentration increased with maturity of the plants in the EPI and SCL, little changes were observed in the lignin distribution. Most of the lignin (84-90%) was found in the rind of the internodes. Lignin concentration in each fraction in the stem internodes of sorghum at the dough-ripe growth stage was EPI=SCLVBPITH for the lowest to the seventh internodes, EPI=SCL=VBPITH for the ninth and eleventh internodes and EPI=SCL=VB=PITH for the thirteenth internode. From the bottom toward the top of the stem lignin concentration increased in the PITH but it decreased in the EPI and SCL. The lignin concentration in the VB was relatively consistent among the internodes. The proportion of lignin for SCL to the total lignin content was greatest in the lower internodes. The higher the internode the greater the proportion of lignin content in the PITH
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