Physiological responses of a fynbos legume, Aspalathus linearis to drought stress

Lötter, Daleen; Valentine, Alex J.; Archer, Emma; Tadross, Mark

doi:10.1016/j.sajb.2014.07.005

Cited by 20 publications

(9 citation statements)

References 36 publications

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“…The interpretation of leaf nitrogen isotope ratio (d 15 N) value is more complex than that of d 13 C because it integrates the conditions of nitrogen source, physiological mechanisms within the plant, and mycorrhizal associations (Michelsen et al 1998;Kolb and Evans 2002). The significant enhancement of leaf d 15 N in all species under drought stress is similar to results of other studies (Austin and Sala 1999; Aranibar et al 2004;Lotter et al 2014;Schulze et al 2014). One possible explanation is that more nitrogen is lost relative to turnover as the water availability decreases (Aranibar et al 2004).…”

Section: Discussionsupporting

confidence: 79%

Drought responses of three closely related Caragana species: implication for their vicarious distribution

2016

Ecology and Evolution

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Drought is a major environmental constraint affecting growth and distribution of plants in the desert region of the Inner Mongolia plateau. Caragana microphylla, C. liouana, and C. korshinskii are phylogenetically close but distribute vicariously in Mongolia plateau. To gain a better understanding of the ecological differentiation between these three species, we examined the leaf gas exchange, growth, water use efficiency, biomass accumulation and allocation by subjecting their seedlings to low and high drought treatments in a glasshouse. Increasing drought stress had a significant effect on many aspects of seedling performance in all species, but the physiology and growth varied with species in response to drought. C. korshinskii exhibited lower sensitivity of photosynthetic rate and growth, lower specific leaf area, higher biomass allocation to roots, higher levels of water use efficiency to drought compared with the other two species. Only minor interspecific differences in growth performances were observed between C. liouana and C. microphylla. These results indicated that faster seedling growth rate and more efficient water use of C. korshinskii should confer increased drought tolerance and facilitate its establishment in more severe drought regions relative to C. liouana and C. microphylla.

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Section: Discussionsupporting

confidence: 79%

Drought responses of three closely related Caragana species: implication for their vicarious distribution

2016

Ecology and Evolution

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“…Inadequate supply of water directly impedes the process of photosynthesis in plants. Preferential development and growth of underground plant parts (roots) to shoot parts of the plant undergoing stress was also observed, which enabled the plant to absorb more water from the inner layer of the earth (Lotter et al 2014 ).…”

Section: Drought Stress In the Reduction Of Plant Performancementioning

confidence: 99%

“…Although A. linearis is capable of forming a symbiotic relationship with rhizobium microbe, drought, on the other hand, affected the nitrogen nutritional content of the plant as a result of its influence on the activities of the nodules and the N 2 fixing enzyme (nitrogenase). This consequently makes the plant more dependent on the available nitrogen in the soil (Lotter et al 2014 ).…”

Section: Drought Stress In the Reduction Of Plant Performancementioning

confidence: 99%

The influence of plant growth-promoting rhizobacteria in plant tolerance to abiotic stress: a survival strategy

Enebe

Babalola

2018

Appl Microbiol Biotechnol

257

105

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Action is needed to face the global threat arising from inconsistent rainfall, rise in temperature, and salinization of farm lands which may be the product of climate change. As crops are adversely affected, man and animals may face famine. Plants are severely affected by abiotic stress (drought, salinity, alkalinity, and temperature), which impairs yield and results in loss to farmers and to the nation at large. However, microbes have been shown to be of great help in the fight against abiotic stress, via their biological activities at the rhizosphere of plants. The external application of chemical substances such as glycine betaine, proline, and nutrients has helped in sustaining plant growth and productive ability. In this review, we tried to understand the part played by bioinoculants in aiding plants to resist the negative consequences arising from abiotic stress and to suggest better practices that will be of help in today’s farming systems. The fact that absolute protection and sustainability of plant yield under stress challenges has not been achieved by microbes, nutrients, nor the addition of chemicals (osmo-protectants) alone suggests that studies should focus on the integration of these units (microbes, nutrients, chemical stimulants, and osmo-protectants) into a strategy for achieving a complete tolerance to abiotic stress. Also, other species of microbes capable of shielding plant from stress, boosting yield and growth, providing nutrients, and protecting the plants from harmful invading pathogens should be sought.

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“…Hertel et al [21] found a doubling of root production and an increase in root-to-leaf biomass and production under drought in a mature beech forest. Even under significant decreases in a plant's relative growth rate, its root growth may remain constant [68]. The ability to re-translocate biomass from leaves and stems or utilize stored nonstructural carbohydrates can increase survival chances [62].…”

Section: Figurementioning

confidence: 99%

Earth System Model Needs for Including the Interactive Representation of Nitrogen Deposition and Drought Effects on Forested Ecosystems

Drewniak

Gonzàlez-Meler

2017

Forests

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Abstract:One of the biggest uncertainties of climate change is determining the response of vegetation to many co-occurring stressors. In particular, many forests are experiencing increased nitrogen deposition and are expected to suffer in the future from increased drought frequency and intensity. Interactions between drought and nitrogen deposition are antagonistic and non-additive, which makes predictions of vegetation response dependent on multiple factors. The tools we use (Earth system models) to evaluate the impact of climate change on the carbon cycle are ill equipped to capture the physiological feedbacks and dynamic responses of ecosystems to these types of stressors. In this manuscript, we review the observed effects of nitrogen deposition and drought on vegetation as they relate to productivity, particularly focusing on carbon uptake and partitioning. We conclude there are several areas of model development that can improve the predicted carbon uptake under increasing nitrogen deposition and drought. This includes a more flexible framework for carbon and nitrogen partitioning, dynamic carbon allocation, better representation of root form and function, age and succession dynamics, competition, and plant modeling using trait-based approaches. These areas of model development have the potential to improve the forecasting ability and reduce the uncertainty of climate models.

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Physiological responses of a fynbos legume, Aspalathus linearis to drought stress

Cited by 20 publications

References 36 publications

Drought responses of three closely related Caragana species: implication for their vicarious distribution

Drought responses of three closely related Caragana species: implication for their vicarious distribution

The influence of plant growth-promoting rhizobacteria in plant tolerance to abiotic stress: a survival strategy

Earth System Model Needs for Including the Interactive Representation of Nitrogen Deposition and Drought Effects on Forested Ecosystems

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