Regulation of Gene Expression in Response to Abiotic Stress in Plants

Rehem, Bruna Carmo; Bertolde, Fabiana Zanelato; Almeida, Alex-Alan Furtado de

doi:10.5772/26636

Cited by 8 publications

(8 citation statements)

References 102 publications

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“…It is reported that lenticel formation is associated with ethylene and auxin accumulation due to stress caused by O 2 deficiency in flooded soil (Bruna et al 2012;Patel et al 2014). Flooded roots contain more amount of ethylene and its precursor (acid-1 aminocyclopropane-1-carboxylic acid-ACC), and high activity of ACC synthase and ACC oxidase compared with normal roots (He et al 1996;Rieu et al 2005;Vidoz et al 2010).…”

Section: Tidal Inundationmentioning

confidence: 99%

Mangrove root: adaptations and ecological importance

Srikanth

Lum

Chen

2015

Trees

161

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Key message This review gives a comprehensive overview of adaptations of mangrove root system to the adverse environmental conditions and summarizes the ecological importance of mangrove root to the ecosystem. Abstract In plants, the first line of defense against abiotic stress is in their roots. If the soil surrounding the plant root is healthy and biologically diverse, the plant will have a higher chance to survive in stressful conditions. Different plant species have unique adaptations when exposed to a variety of abiotic stress conditions. None of the responses are identical, even though plants have become adapted to the exact same environment. Mangrove plants have developed complex morphological, anatomical, physiological, and molecular adaptations allowing survival and success in their high-stress habitat. This review briefly depicts adaptive strategies of mangrove roots with respect to anatomy, physiology, biochemistry and also the major advances recently made at the genetic and genomic levels. Results drawn from the different studies on mangrove roots have further indicated that specific patterns of gene expression might contribute to adaptive evolution of mangroves under high salinity. We also review crucial ecological contributions provided by mangrove root communities to the ecosystem including marine fauna.

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Section: Tidal Inundationmentioning

confidence: 99%

Mangrove root: adaptations and ecological importance

Srikanth

Lum

Chen

2015

Trees

161

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“…Ethylene production could have also resulted in the formation of feeding roots and the development of aerenchyma in partially buried trees, as has been observed during prolonged flooding (Drew et al 1979;Jackson et al 1985;Visser et al 1996). This is in addition to hypertrophied lenticels produced on the portion of A. marina stem and the original stilt roots that were covered below the sediment (Yáñez-Espinosa and Flores 2011; Mielke et al 2005;Bruna et al 2012), suggesting a role of this hormone in partially buried mangrove trees.…”

Section: What Were the Probable Triggers Of The Observed Changes?mentioning

confidence: 76%

“…In addition to ethylene, auxins also play an important role in signalling ethylene-mediated production of feeding roots (Srikanth et al 2015;Bruna et al 2012). The entire process may be facilitated by the ability of the root cap to sense different forms of stimuli from its immediate surrounding, which triggers a series of reactions that direct growth towards or away from un/favourable environmental cues (Kumpf and Nowack 2015).…”

Section: What Were the Probable Triggers Of The Observed Changes?mentioning

confidence: 99%

Mangrove trees survive partial sediment burial by developing new roots and adapting their root, branch and stem anatomy

Okello

Kairo

Dahdouh‐Guebas

et al. 2019

Trees

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Key message Large sedimentation events resulting in partial burial may negatively affect mangrove trees' growth and survival. However, mangroves can adapt to respond dynamically within months to sediment burial, attributes which confer resilience. Abstract Mangrove forests are generally sites of sediment deposition at the coast facilitated by the unique root structure of the trees, thus serving to help the system keep pace with rising sea level. However, at high levels it can cause anoxia in sediments and consequently tree mortality. This study evaluates the morphological and anatomical response of bark and roots of three mangrove tree species (Avicennia marina, Ceriops tagal and Rhizophora mucronata), commonly found along the Kenya coast and around the Indian Ocean, to partial burial by sediment. This was done through simulation of natural and rapid sedimentation in an experiment involving 15, 30 and 45 cm burial levels. Partial sediment burial resulted in an increase in root density which also aided survival particularly in C. tagal, where 5 of the 17 buried trees that did not form new roots in the 45 cm treatment died. Air lacunae in the root cortex became larger in pneumatophores following burial, while the ray parenchyma and cylinder of secondary xylem showed increased widths in cable roots of C. tagal. There was also an induction of the phellogen which produced more outer tissue in the buried section of stems in all three studied species (two fold increase in A. marina and C. tagal and fourfold in R. mucronata). The results suggest that the observed morpho-anatomical adaptations could lead to enhanced performance or recovery of biological processes in the burial-affected trees.

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“…These complex cellular responses were explained by advancements made in investigating and comprehension of plant abiotic responses at different levels. In general, three stages are distinguished during abiotic stress: (1) the stage of alarm; (2) the stage of resistance; and (3) the stage of exhaustion (Rehem et al 2012). However, Lichtenthaler (1988) added the fourth stage-the regeneration stage.…”

Section: Physiological Basis Of Abiotic Stress Tolerance In Plantsmentioning

confidence: 99%

“…Abiotic stress is a general term, which includes miscellaneous stresses e.g. chilling, high temperature, osmotic shock, drought, salinity, water logging, wounding, exposure to ozone, toxic ions, excessive light and UV-B irradiation (Rehem et al 2012). Unfortunately, abiotic stresses are complex in their nature and controlled by networks of different factors (e.g.…”

Section: Introductionmentioning

confidence: 99%