Response of a woody species from Atlantic Rain Forest, <I>Hedyosmum brasiliense</I> Mart. ex Miq. (Chloranthaceae), submitted to water stress<p>doi: 10.5007/2178-4574.2010v39p1

Abstract

The studies about water status for woody plants of the Atlantic rain forest are negligence, despite its altitudinal gradient which reflect in five topographic formations with different water availability and the poor conservation status of this biome and high level of habitat fragmentation that demands a deeper scientific knowledge regarding species response to environmental heterogeneity. Seedlings of Hedyosmum brasiliense Mart. ex Miq., present at all altitudinal gradient of Atlantic rain forest were submitted to water stress and the results indicated that the species presents strategy that provides delay of tissue dissection through the adoption of mechanisms that can promote higher water absorption and retention with possibly aids its altitudinal distribution in Atlantic rain forest. These mechanisms were the increase of the root length, stomatal density, epidermis and palisade parenchyma thickness, root xylem arches; the higher distribution of carbon to root related to the shoot; the decrease of the leaf area, LAR, stomatal aperture, stomatal size, intercellular spaces and the presence of osmotic adjustment through the increase in the proline content.

Divergent strategies to reduce stomatal pore index during water deficit in perennial angiosperms

“…Reduced SPI in response to water deficit has been demonstrated in some tree species (Gindel, 1969;Camposeo et al, 2011), but is not the typical response in trees (unpublished metaanalysis; Aasamaa et al, 2001;Luo et al, 2007;Eksteen et al 2013) due to no anatomical changes occurring or the fact that the often-observed reduction in SS is not sufficient to have an impact on SPI (Aasamaa et al, 2001;Luo et al, 2007;Machado et al, 2010;de Silva et al, 2012;Eksteen et al, 2013;Catoni et al, 2017). However, it is clear from our study that some tree species do respond to water deficit stress via stomatal development plasticity.…”

Ecophysiological response of Astronium fraxinifolium (Anacardiaceae) in degraded and non-degraded brazilian Cerrado

“…In the literature, there are species that under environmental impact present an increase in leaf area (Gobbi et al 2011;Rad et al 2011), and in other species there is a decrease (Scalon et al 2011;Machado et al 2010;Maranho et al 2006;Alves et al 2001), in addition it should be expected increase in leaf area in leaves of Astronium fraxinifolium as a way to compensate the low amount of chlorophyll.…”