Wood and bark anatomy variation of Annona glabra L. under flooding [Variación anatómica en la madera y en la corteza de Annona glabra L. Bajo inundación]
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Most studies related to the analysis of flooding effect in secondary xylem have focused on mangrove species. Annona glabra L. grows associated to mangrove species in the Pacific coast of Mexico, where contrasting flooding regimes are present. This study was undertaken to gain insight in the effect of contrasting water regimens and flooding levels in the wood and bark of A. glabra. Results show that major adaptations are present in the bark under flooding level. Bark develops aerenchyma in collapsed phloem and rhytidome, adventitious roots and hypertrophied lenticels. Canonical discriminant analysis show that three phloem features and two wood features contribute significantly to differences between flooding sites and flooding levels. Variance analyses show statistically significant differences between the noncollapsed phloem width growing above and under flooding levels; and phloem and wood rays%27 height and vessel frequency between permanent and temporal flooding regimens. The results suggest that modifications in bark compensate the lack of oxygen under site conditions, while those in wood favor safety for water conduction.
Most studies related to the analysis of flooding effect in secondary xylem have focused on mangrove species. Annona glabra L. grows associated to mangrove species in the Pacific coast of Mexico, where contrasting flooding regimes are present. This study was undertaken to gain insight in the effect of contrasting water regimens and flooding levels in the wood and bark of A. glabra. Results show that major adaptations are present in the bark under flooding level. Bark develops aerenchyma in collapsed phloem and rhytidome, adventitious roots and hypertrophied lenticels. Canonical discriminant analysis show that three phloem features and two wood features contribute significantly to differences between flooding sites and flooding levels. Variance analyses show statistically significant differences between the noncollapsed phloem width growing above and under flooding levels; and phloem and wood rays' height and vessel frequency between permanent and temporal flooding regimens. The results suggest that modifications in bark compensate the lack of oxygen under site conditions, while those in wood favor safety for water conduction.
