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| Publication Type:
| Refereed |
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| Author(s): | MacAdam, Jennifer W.;
Sharp, Robert E.;
Nelson, Curtis J. |
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| Author Affiliation: | Department of Plants, Soils, and Biometeorology, Utah State University; Department of Agronomy, University of Missouri |
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| Title: | Peroxidase activity in the leaf elongation zone of tall fescue II. Spatial distribution of apoplastic peroxidase activity in genotypes differing in length of the elongation zone |
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| Source: | Plant Physiology. Vol. 99, No. 3, July 1992, p. 879-885. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Vertical shoot growth; Peroxidase; Festuca arundinacea
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| Abstract/Contents: | "Previous work suggested that cell wall peroxidase activity increased as cells were displaced through the elongation zone in leaf blades of tall fescue (Festuca arundinacea Schreb.). In this study, two genotypes that differ in length of the elongation zone were used to examine the relationship between peroxidase activity in apoplastic fluid of intact leaf blade segments and the spatial distribution of leaf growth. Apoplastic fluid was extracted by vacuum infiltration and centrifugation, and peroxidase activity was assayed spectrophotometrically. Isoeletric focusing was used to characterize the isoforms of apoplastic peroxidase within the region of elongation and in the region of secondary cell wall depostition, which is distal to the elongation zone. A striking correlation was found in each genotype between both the location and timing of increase in apoplastic peroxidase activity and the onset of growth deceleration. Only cationic isoforms of apoplastic peroxidase could be identified in the elongation zone, whereas additional anionic isoforms appeared in the region of secondary cell wall deposition. We conclude that cessation of elongation growth in tall fescue blades is likely to be related to the secretion of cationic isoforms of peroxidase into the cell wall." |
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| Language: | English |
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| References: | 26 |
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| Note: | Pictures, b/w
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
MacAdam, J. W., R. E. Sharp, and C. J. Nelson. 1992. Peroxidase activity in the leaf elongation zone of tall fescue II. Spatial distribution of apoplastic peroxidase activity in genotypes differing in length of the elongation zone. Plant Physiol. 99(3):p. 879-885. |
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