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Role of Pigments and Tannins in the Reaction of Tan and Red Near-Isogenic Sorghum Lines to Leaf Diseases
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...
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Published in: | African crop science journal 2009-03, Vol.1 (2) |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | 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. Leaves, stems,
sheaths, glumes and seeds of mature plants were assayed for tannins,
pigments, and precursors of these pigments. No tannins were detected in
the various plant tissues 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 apigenin. Near-isogenic
pairs were tested for differential reactions to anthracnose (
Colletotrichum graminicola Ces.) at Tifton, Georgia and to rust (
Puccinia purpurea Cooke) at Isabella, Puerto Rico during the 1991
growing season. Tan and red isogenic pairs, which differ significantly
in phenolic composition, did not show significant differences in their
disease reaction. 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 were
analyzed, there was no correlation with resistance or susceptibility.
It is proposed that tannins, pigments, and pigment precursors are not
responsible for disease resistance in these genotypes. |
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ISSN: | 1021-9730 |