Relationships between phenolics-conjugated polyamines and sensitivity of sugarcane to smut (Ustilago scitaminea) |
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| Authors: | Legaz M; de Armas R; Pinon D; Vicente C |
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| Institution: | Department of Plant Physiology, Faculty of Biology, Complutense University, 28040 Madrid, Spain; Department of Plant Physiology, Faculty of Biology, Havana University, Cuba; Institute of Sugar Cane Research (INICA), 17203 Van Troy Av., Boyeros, Havana, Cuba; Corresponding author |
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| Abstract: | Infection of sugarcane buds (var. Barbados 42231) with teliospores of
Ustilago scitaminea changes the pattern of polyamine
conjugation in several organs of 2-month-old plants. Stalks of infected
plants contain SH-spermidine that does not occur in the healthy organ.
Similar results have been obtained for SH-spermine in the first expanded
leaf and in the stem. The amount of SH-cadaverine in the first expanded
leaf, roots and stem of infected plants is always higher than that found
for healthy plants. Some phenolics are also associated with different
polyamine fractions. So, the amount of
p-hydroxybenzoic acid in both SH and PH fractions of
polyamines extracted from the root increases after infection. Syringic acid
is the main phenol associated with the PH fraction in the first expanded
leaf of infected plants, whereas this phenol is mainly associated with both
SH and PH fractions isolated from the stem and the whip. Infection enhances
conjugation of p-courmaric acid to PH polyamines,
whereas caffeic acid appears in the SH fraction in leaf, root and stem.
However, ferulic acid seems to be the main hydroxycinnamic acid derivative
in the whip. Chlorogenic acid is associated with the SH fraction from the
stem of healthy plants although this changes to free phenolics after
infection.Key words:Saccharum officinarum, Ustilago
sciaminea, phenolics, polyamines.
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