Magnolias as urban trees – a preliminary evaluation of drought tolerance in seven magnolia species

Sjöman, Henrik; Hirons, Andrew; Bassuk, Nina L.

doi:10.1080/03071375.2017.1415554

Cited by 14 publications

(29 citation statements)

References 21 publications

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“…Data presented here adds further evidence that foliar dehydration and π tlp can identity whole-plant drought tolerance (Jane and Green 1983;Percival and Sheriffs 2002;Baltzer et al 2008;Faraloni et al 2011;Bartlett et al 2012a;Sjöman et al 2015Sjöman et al , 2018b. However, the timing of dehydration studies is highly important.…”

Section: Discussionmentioning

confidence: 53%

“…Leaf dehydration studies account for foliar anatomical and morphological adaptations such as trichomes, sunken stomata, thick cuticles and reduced leaf size. Another method currently gaining attention is the measurement or estimation of water potential at the turgor loss point (π tlp ) (Maréchaux et al 2015;Sjöman et al 2015Sjöman et al , 2018b; this measure is indicative of the permanent wilting point (Bartlett et al 2012b). The π tlp is known also to reflect the point below which a plant cannot take up sufficient soil water, and is, therefore, considered a 'higher-level' drought tolerance trait (Bartlett et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Sjöman et al (2015Sjöman et al ( , 2018 also identify seasonal change in π tlp within a range of Acer and Magnolia species and cultivars. They identify that spring tolerance is lower and the species tested rank differently in comparison to summer tolerance (Sjöman et al 2015(Sjöman et al , 2018b. Little information is, however, available to suggest if tolerance levels are maintained or decline following summer tolerance acquisition.…”

Section: Introductionmentioning

confidence: 99%

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Variations in seasonal drought tolerance rankings

Banks

Percival²,

Rose

2019

Trees

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Key message Cultivars of Acer platanoides, A. pseudoplatanus and A. campestre show significant seasonal drought tolerance variation, identified by in vitro desiccation a whole-tree drought and water potential at turgor-loss-point. Abstract Drought is one of the most common and significant disorders affecting tree establishment and growth, in the urban environment. Consequently, improving tree selection by the provision of quantifiable tolerance data by which to evaluate genotypes is an important area of scientific research. A number of in vitro studies address drought tolerance in isolation, at a single time point during the growing season. Using an in vitro foliar dehydration method to evaluate closely related genotypes of Acer platanoides, A. pseudoplatanus and A. campestre, drought tolerance rankings were not found to be consistent throughout the growing season (spring, summer and autumn). i.e., A. pseudoplatanus 'Negenia' was found to be comparatively drought tolerant in spring, but displayed moderate to low comparative tolerance in summer and autumn; as measured using in vitro foliar dehydration as a proxy for drought tolerance. Drought conditions are most severe and common in summer; however, this study discusses the need to consider spring tolerance in addition to summer or autumn, particularly when selecting trees for tough urban sites, prone to drought stress across all three seasons.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variations in seasonal drought tolerance rankings

Banks

Percival²,

Rose

2019

Trees

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“…Finally, Sjöman, Hirons, and Bassuk (2018) examine the drought tolerance of magnolias in urban situations. The genus Magnolia includes 224 species with both deciduous and evergreen trees and shrubs.…”

Section: Visions Of Treescapes and Services From Treesmentioning

confidence: 99%

Visions of treescapes and services from trees

Rotherham¹

2018

Arboricultural Journal

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“…Tree selection is often focused on aesthetic characteristics [8], however, when tolerance is considered it is often based on personal experience and observation. Data from plant-use literature and scientific studies is frequently inconsistent between sources and often lacks specificity [5, 9]. Increases in the frequency and severity of drought events are expected as a result of climate change [10–12].…”

Section: Introductionmentioning

confidence: 99%

Alternative methods of estimating the water potential at turgor loss point in Acer genotypes

Banks

Hirons

2019

Plant Methods

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Background Selecting for drought tolerance in urban tree species can have a significant influence on survival rates, aftercare requirements and performance. The water potential at turgor loss point (π tlp ) is gaining popularity as a trait to help determine drought tolerance to aid tree selection. Therefore, it is important to understand if differing methods used to measure or calculate π tlp deliver consistent results. Results The sensitivity of three methods used to determine this valuable selection parameter were evaluated. A classical pressure chamber, pressure–volume (P–V) curve method was compared with vapour-pressure osmometer (Vapro ® ) and dewpoint hygrometer (WP4C) methods. These methods were evaluated using closely related cultivars of Acer platanoides and A. pseudoplatanus ‘Negenia’. Conclusion Both the osmometer and hygrometer methods ranked genotypes with a very high similarity (R s = 1, R 2 = 0.96) and were able to identify significant differences between cultivars. This is the first study to demonstrate suitability of the dewpoint hygrometer in comparison to the vapour-pressure osmometer to measure π tlp . The P–V method was unable to identify differences between the cultivars tested. The Vapro and WP4C provide greater applicability than the conventional P–V method to studies requiring both high throughput and high sensitivity. Consistency of measurement type is however highly recommended in future studies as some differences were observed between Vapro and WP4C. Electronic supplementary material The online version of this article (10.1186/s13007-019-0410-3) contains supplementary material, which is available to authorized users.

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Magnolias as urban trees – a preliminary evaluation of drought tolerance in seven magnolia species

Cited by 14 publications

References 21 publications

Variations in seasonal drought tolerance rankings

Variations in seasonal drought tolerance rankings

Visions of treescapes and services from trees

Alternative methods of estimating the water potential at turgor loss point in Acer genotypes

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