Physiological and Biochemical Responses in Two Ornamental Shrubs to Drought Stress

Toscano, Stefania; Farieri, Elisa; Ferrante, António; Romano, Daniela

doi:10.3389/fpls.2016.00645

Cited by 119 publications

(79 citation statements)

References 59 publications

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“…The growth reduction of plants, and hence the lower plant biomass, represents the final expression of a number of processes analyzed to determine salt and water stress tolerance [28,32,42]. In our study, in both species, the severe drought stress (20% WC and 10% WC) led in particular to a decrease of the shoot dry biomass.…”

Section: Discussionmentioning

confidence: 57%

Effects of Water Stress on Gas Exchange, Water Relations and Leaf Structure in Two Ornamental Shrubs in the Mediterranean Area

et al. 2019

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One of the main problems in the Mediterranean area is the long dry season, and hence there is a need to individuate plants that are tolerant to low water availability. The mechanisms adopted by different plant species to overcome drought stress conditions and reduce water loss could allow the identification of tolerant species to drought stress, thereby increasing the sustainability of ornamental plant utilization in green areas. In this regard, the aim of this study was to investigate the morphological, physiological, and anatomical responses of Polygala myrtifolia L. and Viburnum tinus L. 'Lucidum' irrigated under different irrigation deficits. In pot plants, four water regimes were adopted (10%, 20%, 30% and 40% of water container capacity (WC)). Drought stress significantly reduced the biomass accumulation in both shrubs. In Viburnum, total dry biomass reduction was observed only in 10% WC with a reduction by 33%, while in Polygala, this was observed both in 20% WC and 10% WC (~48%). The higher deficit irrigation conditions improve the root-to-shoot ratio, which was increased in Polygala 20% WC (by 20%) but not in Viburnum ones. The latter species shows higher drought tolerance, as demonstrated by the gas exchange values, chlorophyll fluorescence, leaf structure, and water relationship.Mediterranean native shrub species to water stress [5], also allowing the identification of new ornamentals suitable for sustainable landscaping. The ability of Mediterranean shrubs to tolerate severe drought conditions, one of the main factors affecting plant survival and species distribution, increases their use in the revegetation of semiarid areas [6].Different species growing in Mediterranean areas could provide good candidates for ornamental plants regarding their tolerance to water shortages. Drought stress harms aesthetic aspects and consequently affects ornamental plant quality. The latter in fact mainly depends on visual appearance, identified as leaf size and color, flower characteristics, number and longevity [7]. Drought stress can also dramatically reduce plant survival after transplantation with high economic losses and impacts on the aesthetic quality of green areas [8].The successful establishment of ornamental green areas in Mediterranean regions can be achieved through the adequate selection of plant species characterized by a high tolerance to water stress [9]. Tolerant plants are those plants that have the ability to modify their metabolism to guarantee vital and essential physiological processes with a limited amount of water [10]; most of them are Mediterranean-native species.Drought-tolerant plants are able to modify, during water stress conditions, their morphology and to activate physiological and biochemical processes able to cope with water deficit [11,12]. The morphological modifications linked to drought stress reduce shoot and leaf growth, although the modality and the intensity of these phenomena depend on the genotypes, even within the same species [12]. Previous results showed that in Lantana c...

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Section: Discussionmentioning

confidence: 57%

Effects of Water Stress on Gas Exchange, Water Relations and Leaf Structure in Two Ornamental Shrubs in the Mediterranean Area

et al. 2019

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“…Low MDA levels has been correlated with desiccation stress tolerance and the ensuing lipid peroxidation could induce the activity of antioxidant enzymes (Wang et al, 2012). Accumulation of MDA when challenged by environmental stresses has also been found to be a good drought tolerance index in other plant species pitanga (Toscano et al, 2016), melon (Sarabi, et al, 2017), desi chickpea (Farooq et al, 2018) and wheat (Mickky and Aldesuquy, 2016). From all the physiological responses examined, it evident that of finger millet responses to drought stress largely depends on the genotype/cultivars used the length and severity of water deficit stress and the stage of development of the plant.…”

Section: Discussionmentioning

confidence: 99%

Differential characterization of physiological and biochemical responses during drought stress in finger millet varieties

Mukami

Ngetich

Mweu

et al. 2019

Preprint

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Drought is the most perilous abiotic stress that affects finger millet growth and productivity worldwide. For the successful production of finger millet, selection of drought tolerant varieties is necessary and critical stages under drought stress, germination and early seedling growth, ought to be fully understood. This study investigated the physiological and biochemical responses of six finger millet varieties (GBK043137, GBK043128, GBK043124, GBK043122, GBK043094 and GBK043050) under mannitol-induced drought stress. Seeds were germinated on sterile soil and irrigated with various concentrations of mannitol (200, 400 and 600 mM) for two weeks. Comparative analysis in terms of relative water content (RWC), chlorophyll, proline, and malondialdehyde (MDA) contents were measured the physiological and biochemical characteristics of drought stress. The results showed that increased level of drought stress seriously decreased germination and early seedling growth of finger millet varieties. However, root growth was increased. In addition, exposition to drought stress triggered a significant decrease in relative water content and chlorophyll content reduction the biochemical parameters assay showed less reduction of relative water content. Furthermore, oxidative damage indicating parameters such as proline concentration and MDA content increased. Varieties GBK043137 and GBK043094 were less affected by drought as shown by significant change in the physiological parameters. Our findings reveal the difference and linkage between the physiological responses of finger millet to drought and are vital for breeding and selection of drought tolerant varieties of finger millet. Further investigations on genomic and molecular to deeply insight the detail mechanisms of drought tolerance in finger millet need to explored.

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“…It can occur at any plant developmental stage however certain plant growth phase is highly sensitive for soil moisture status that severely hampers the overall crop yield (Toscano et al, 2016). Onion being a shallow rooted crop is highly sensitive to drought stress.…”

Section: Resultsmentioning

confidence: 99%

Physiological and Biochemical Responses in Onion Crop to Drought Stress

Ghodke¹,

Andhale²,

Gijare³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Physiological and Biochemical Responses in Two Ornamental Shrubs to Drought Stress

Cited by 119 publications

References 59 publications

Effects of Water Stress on Gas Exchange, Water Relations and Leaf Structure in Two Ornamental Shrubs in the Mediterranean Area

Effects of Water Stress on Gas Exchange, Water Relations and Leaf Structure in Two Ornamental Shrubs in the Mediterranean Area

Differential characterization of physiological and biochemical responses during drought stress in finger millet varieties

Physiological and Biochemical Responses in Onion Crop to Drought Stress

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