Articles
ROLE OF PIGMENTS AND TANNINS IN THE REACTION OF TAN AND RED NEAR-ISOGENIC SORGHUM LINES TO LEAF DISEASES
Article number
381_96
Pages
675 – 678
Language
Abstract
Sorghum (Sorghum bicolor L. Moench) plant pigments have been associated with resistance to leaf diseases and grain deterioration.
Four near-isogenic pairs of tan and non-tan (red) sorghum lines were assayed for their phenolic content and evaluated for their reaction to leaf diseases along with six other sorghum lines.
No proanthocyanidins were detected in various plant tissues (seeds, sheath, glume, and leaves) although other genotypes can have high levels of these compounds in seed coats.
The red plants (especially the glumes and sheath) were found to accumulate 3-deoxyanthocyanidins, the major pigments in sorghum, but these were absent in the tan plants.
The glumes and sheath of tan plants accumulated the flavone, apigenin.
Tan and red isogenic pairs, which differ significantly in phenolic composition, did not show significant differences in their reaction to the leaf diseases, rust (Puccinia purpurea Cooke) and anthracnose (Colletotrichum graminicola Ces.). The six other sorghum lines which showed marked differences in their reaction to leaf diseases also showed differences in their phenolic composition.
However, for the phenols that we analyzed, there was no correlation with resistance or susceptibility.
We propose that proanthocyanidins, pigments, and pigment precursors are not responsible for disease resistance in these genotypes.
Four near-isogenic pairs of tan and non-tan (red) sorghum lines were assayed for their phenolic content and evaluated for their reaction to leaf diseases along with six other sorghum lines.
No proanthocyanidins were detected in various plant tissues (seeds, sheath, glume, and leaves) although other genotypes can have high levels of these compounds in seed coats.
The red plants (especially the glumes and sheath) were found to accumulate 3-deoxyanthocyanidins, the major pigments in sorghum, but these were absent in the tan plants.
The glumes and sheath of tan plants accumulated the flavone, apigenin.
Tan and red isogenic pairs, which differ significantly in phenolic composition, did not show significant differences in their reaction to the leaf diseases, rust (Puccinia purpurea Cooke) and anthracnose (Colletotrichum graminicola Ces.). The six other sorghum lines which showed marked differences in their reaction to leaf diseases also showed differences in their phenolic composition.
However, for the phenols that we analyzed, there was no correlation with resistance or susceptibility.
We propose that proanthocyanidins, pigments, and pigment precursors are not responsible for disease resistance in these genotypes.
Authors
B.A. Siame, G. Ejeta, L.G. Butler
Keywords
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