Response of <i>Trifolium repens</i> to UV‐B radiation: morphological links to plant productivity and water availability

Hofmann, Rainer; Campbell, Bruce

doi:10.1111/j.1438-8677.2011.00458.x

Cited by 23 publications

(10 citation statements)

References 29 publications

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“…Conversely, higher quercetin glycoside accumulation under UV‐B was correlated with tolerance against UV‐B‐induced growth reduction (Hofmann et al . ; Hofmann & Campbell ). Thus, the role of flavonoids in UV‐induced morphogenesis is multifaceted, and consequences for growth may depend on the strength of UV and extent of flavonoid induction.…”

Section: Plant Morphology and Flavonoid Accumulation: A Two‐way Intermentioning

confidence: 99%

Re‐interpreting plant morphological responses to UV‐B radiation

Robson

Klem

Urban

et al. 2014

Plant Cell & Environment

248

194

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There is a need to reappraise the effects of UV-B radiation on plant morphology in light of improved mechanistic understanding of UV-B effects, particularly elucidation of the UV RESISTANCE LOCUS 8 (UVR8) photoreceptor. We review responses at cell and organismal levels, and explore their underlying regulatory mechanisms, function in UV protection and consequences for plant fitness. UV-induced morphological changes include thicker leaves, shorter petioles, shorter stems, increased axillary branching and altered root:shoot ratios. At the cellular level, UV-B morphogenesis comprises changes in cell division, elongation and/or differentiation. However, notwithstanding substantial new knowledge of molecular, cellular and organismal UV-B responses, there remains a clear gap in our understanding of the interactions between these organizational levels, and how they control plant architecture. Furthermore, despite a broad consensus that UV-B induces relatively compact architecture, we note substantial diversity in reported phenotypes. This may relate to UV-induced morphological changes being underpinned by different mechanisms at high and low UV-B doses. It remains unproven whether UV-induced morphological changes have a protective function involving shading and decreased leaf penetration of UV-B, counterbalancing trade-offs such as decreased photosynthetic light capture and plant-competitive abilities. Future research will need to disentangle seemingly contradictory interactions occurring at the threshold UV dose where regulation and stress-induced morphogenesis overlap.

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Section: Plant Morphology and Flavonoid Accumulation: A Two‐way Intermentioning

confidence: 99%

Re‐interpreting plant morphological responses to UV‐B radiation

Robson

Klem

Urban

et al. 2014

Plant Cell & Environment

248

194

View full text Add to dashboard Cite

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“…Evidence of UV-B-induced inhibition of germination has been provided by several studies to date (Tevini et al 1983, Tosserams et al 1997, Dai and Upadhyaya 2002. There is also clear evidence for inter-and intraspecific differences in UV-B sensitivity in plants (Hofmann and Campbell 2011). However, UV-B sensitivity of invasive species and the consequences for establishment and spread of populations have been studied only rarely.…”

Section: Introductionmentioning

confidence: 99%

“…In particular drought, which can evoke similar plant responses as UV-B (Tevini et al 1981, Hofmann et al 2003, is a factor to be considered, preferably in interaction with UV-B. UV-B effects interact with irradiation intensity and with exposure to drought (Hofmann and Campbell 2011), affecting physiological responses in grassland habitats, and thus the interaction of such factors for germination attributes need to be more critically taken into consideration in future studies.…”

Section: Evidence Of Recent Adaptationmentioning

confidence: 99%

Effects of UV-B radiation on germination characteristics in invasive plants in New Zealand

Hock¹,

Beckmann²,

Hofmann³

et al. 2015

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UV-B radiation represents a potentially selective, yet little studied environmental factor for plant invasions, especially with respect to germination characteristics and seedling establishment in areas of high UV-B exposure such as New Zealand. To explain invasive potential of plant species pre-adaptation and local adaptation to selection factors in the invaded range are two frequently consulted concepts. To test for the relevance of these mechanisms, it is necessary to compare both invasive and non-invasive species, as well as native and exotic origins of invasive species. In the present study, germination success of two congeneric species pairs of the genera Verbascum (Scrophulariaceae) and Echium (Boraginaceae) were investigated under high UV-B intensities. Each genus comprised one species that has successfully invaded New Zealand grasslands and one species that was introduced but has not been invasive in New Zealand. In an among-species approach, pre-adaptation was tested by comparing germination success of native (European) origins of all four species in relation to their different invasive success in New Zealand. In a within-species comparison, native (European) and exotic (New Zealand) origins of the two invasive species were compared to test for local adaptation to UV-B in the invaded range. In both approaches, UV-B radiation inhibited the germination success of all study species. However, the comparison of invasive and non-invasive species of the two genera showed no UV-B-specific pre-adaptation of invasive species to high NeoBiotaMaria Hock et al. / NeoBiota 26: 21-37 (2015) 22 UV-B intensities. Higher germination success of invasive species probably led to an establishment advantage during colonization of the invaded range. Although local adaptation of exotic populations to UV-B could not be demonstrated in the within-species approach, a genetic shift in germination velocity between native and exotic origins was found. These differences may be ascribed to other relevant environmental factors, e.g. overall irradiation and drought, inducing similar plant responses as under UV-B radiation.

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“…In parallel with UV-B induced decreases in leaf size, leaf venation also changes, with a notable decrease in the width of the mid-rib of soybean (Glycine max) leaves (Fatima et al, 2016). Typically, stems will remain shorter, as detailed for various species (Barnes et al, 1990;Hofmann and Campbell, 2011;Germ et al, 2013). Although the length of the main stem may decrease in UV-B acclimated plants, overall stem length does not necessarily decrease due to enhanced axillary branching and/or tillering (cf.…”

Section: -The Uv-b Phenotypementioning

confidence: 99%

UV-B-induced morphological changes - an enigma.

Jansen¹,

Klem²,

Robson³

et al. 2017

UV-B Radiation and Plant Life: Molecular Biology to Ecology

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UV-B induces complex changes in plant morphology, including decreases in petiole length, leaf area and/or increases in thickness together with shorter, but more branched stems. The resulting, compact, phenotype is widely reported in the literature. Yet, major questions remain with respect to the precise phenotype, the underlying mechanism, and the functional role. Complex dose-response curves, a mixture of transient and permanent morphological changes, and distinct effects on cell and organismal development, indicate that at least two distinct UV-B phenotypes exist. One phenotype is mediated through the UV-B photoreceptor UVR8, and has been linked to, amongst others, decreases in hypocotyl length and petiole elongation. The second UV-B induced phenotype is associated with generic, oxidative plant stress, as detailed by the concept of Stress Induced Morphological Responses (SIMR). Despite differences in underlying mechanism, both UV-B responses lead to a compact phenotype. The functional role of this phenotype remains unclear, and assertions that the phenotype contributes to UV-B protection remain unproven. A key target for future research is the development of markers that distinguish the two UV-B induced phenotypes, and therefore facilitate systematic studies of their functional role and environmental relevance.

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Response of Trifolium repens to UV‐B radiation: morphological links to plant productivity and water availability

Cited by 23 publications

References 29 publications

Re‐interpreting plant morphological responses to UV‐B radiation

Re‐interpreting plant morphological responses to UV‐B radiation

Effects of UV-B radiation on germination characteristics in invasive plants in New Zealand

UV-B-induced morphological changes - an enigma.

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