Carlos L. Ballaré

Consejo Nacional de Investigaciones Científicas y Técnicas

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Ana L. Scopel

University of Buenos Aires

Amy T. Austin

Agricultural Plant Physiology and Ecology Research Institute

Stephan D. Flint

Utah State University

Martyn M. Caldwell

Utah State University

C. A. da S. Mazza

Consejo Nacional de Investigaciones Científicas y Técnicas

Paul W. Barnes

Loyola University New Orleans

Janet F. Bornman

Murdoch University

R. A. Sánchez

University of Buenos Aires

Sharon A. Robinson

University of Wollongong

Jorge J. Casal

Consejo Nacional de Investigaciones Científicas y Técnicas

Cooperative Institutions

University of Buenos Aires

Consejo Nacional de Investigaciones Científicas y Técnicas

Agricultural Plant Physiology and Ecology Research Institute

Wageningen University & Research

Utrecht University

Utah State University

Salk Institute for Biological Studies

University of California, San Diego

Plant (United States)

University of California, Davis

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Phytochrome Regulation of Plant Immunity in Vegetation Canopies

Journal of Chemical Ecology (2014)

Javier E. Moreno Carlos L. Ballaré

Jasmonic acid

Plant Immunity

Phytochrome

Shade avoidance

Biotic stress

10.1007/s10886-014-0471-8

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Citations (34)

Plant Photomorphogenesis in Canopies, Crop Growth, and Yield

HortScience (1995)

Carlos L. Ballaré Ana L. Scopel Rodolfo A. Sánchez

Photomorphogenesis

10.21273/hortsci.30.6.1172

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Citations (77)

Epichloë Fungal Endophytes and Plant Defenses: Not Just Alkaloids

Trends in Plant Science (2017)

Daniel A. Bastías M. Alejandra Martínez‐Ghersa Carlos L. Ballaré Pedro E. Gundel

Endophyte

Epichloë

Plant science

10.1016/j.tplants.2017.08.005

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Citations (192)

Chromosomal loci important for cotyledon opening under UV-B in Arabidopsis thaliana

BMC Plant Biology (2010)

Mariana Conte Silvia De Simone Susan J. Simmons Carlos L. Ballaré Ann E. Stapleton

Abstract Background Understanding of the genetic architecture of plant UV-B responses allows extensive targeted testing of candidate genes or regions, along with combinations of those genes, for placement in metabolic or signal transduction pathways. Results Composite interval mapping and single-marker analysis methods were used to identify significant loci for cotyledon opening under UV-B in four sets of recombinant inbred lines. In addition, loci important for canalization (stability) of cotyledon opening were detected in two mapping populations. One candidate locus contained the gene HY5 . Mutant analysis demonstrated that HY5 was required for UV-B-specific cotyledon opening. Conclusions Structured mapping populations provide key information on the degree of complexity in the genetic control of UV-B-induced cotyledon opening in Arabidopsis. The loci identified using quantitative trait analysis methods are useful for follow-up testing of candidate genes.

Cotyledon

Candidate gene

10.1186/1471-2229-10-112

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Citations (14)

Differential UVR8 Signal across the Stem Controls UV-B–Induced Inflorescence Phototropism

The Plant Cell (2019)

Lucas Vanhaelewyn András Viczián Els Prinsen Péter Bernula A. Serrano

In the course of evolution, plants have developed mechanisms that orient their organs toward the incoming light. At the seedling stage, positive phototropism is mainly regulated by phototropin photoreceptors in blue and UV wavelengths. Contrasting with this, we report that UV RESISTANCE LOCUS8 (UVR8) serves as the predominant photoreceptor of UV-B–induced phototropic responses in Arabidopsis (Arabidopsis thaliana) inflorescence stems. We examined the molecular mechanisms underlying this response and our findings support the Blaauw theory (Blaauw, 1919), suggesting rapid differential growth through unilateral photomorphogenic growth inhibition. UVR8-dependent UV-B light perception occurs mainly in the epidermis and cortex, but deeper tissues such as endodermis can also contribute. Within stems, a spatial difference of UVR8 signal causes a transcript and protein increase of transcription factors ELONGATED HYPOCOTYL5 (HY5) and its homolog HY5 HOMOLOG at the UV-B–exposed side. The irradiated side shows (1) strong activation of flavonoid synthesis genes and flavonoid accumulation; (2) increased gibberellin (GA)2-oxidase expression, diminished GA1 levels, and accumulation of the DELLA protein REPRESSOR OF GA1; and (3) increased expression of the auxin transport regulator PINOID, contributing to diminished auxin signaling. Together, the data suggest a mechanism of phototropin-independent inflorescence phototropism through multiple, locally UVR8-regulated hormone pathways.

Phototropism

Phototropin

Gravitropism

10.1105/tpc.18.00929

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Citations (31)

Zooming in on plant interactions

Oecologia (2013)

Carlos L. Ballaré Katherine L. Gross Russell K. Monson

10.1007/s00442-013-2621-z

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Citations (4)

Sunlight Doubles Aboveground Carbon Loss in a Seasonally Dry Woodland in Patagonia

Current Biology (2020)

Paula Berenstecher Lucía Vivanco Luis I. Pérez Carlos L. Ballaré Amy T. Austin

Litter

Plant litter

10.1016/j.cub.2020.06.005

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Citations (35)

Far-red light increases maize volatile emissions in response to volatile cues from neighboring plants

bioRxiv (Cold Spring Harbor Laboratory) (2022)

Rocío Escobar‐Bravo Bernardus C. J. Schimmel Yaqin Zhang Lei Wang Christelle A. M. Robert

Abstract Plants perceive the presence and defense status of their neighbors through light and volatile cues, but how plants integrate both stimuli is poorly understood. We investigated if and how low Red to Far red light (R:FR) ratios, indicative of shading or canopy closure, affect maize ( Zea mays ) responses to herbivore-induced plant volatiles (HIPVs), including the green leaf volatile ( Z )-3-hexenyl acetate. We modulated light signaling and perception by using FR supplementation and a phyB1phyB2 mutant, and we determined volatile release as a response readout. To gain mechanistic insights, we examined expression of volatile biosynthesis genes, hormone accumulation, and photosynthesis. Exposure to a full blend of HIPVs or ( Z )-3-hexenyl acetate induced maize volatile release. Short-term FR supplementation increased this response. In contrast, prolonged FR supplementation or constitutive phytochrome B inactivation in phyB1phyB2 plants showed the opposite response. Short-term FR supplementation enhanced photosynthesis and stomatal conductance and ( Z )-3-hexenyl acetate-induced JA-Ile levels. We conclude that a FR-enriched light environment can prompt maize plants to respond more strongly to HIPVs emitted by neighbors, which might be explained by changes in photosynthetic processes and phytochrome B signaling. Our findings reveal interactive responses to light and volatile cues with potentially important consequences for plant-plant and plant-herbivore interactions.

10.1101/2022.09.12.507519

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Citations (3)

Inhibition of hypocotyl elongation by ultraviolet‐B radiation in de‐etiolating tomato seedlings. I. The photoreceptor

Physiologia Plantarum (1995)

Carlos L. Ballaré Paul W. Barnes Stephan D. Flint

Broad‐band UV‐B radiation inhibited hypocotyl elongation in etiolated tomato ( Lycopersicon esculentum Mill. cv. Alisa Craig) seedlings. This inhibition could be elicited by < 3 μmol m −2 s −1 of UV‐B radiation provided against a background of white light (> 620 μmol m −2 s −1 between 320 and 800 nm), and was similar in wild‐type and phytochrome‐1‐deficient aurea mutant seedlings. These observations suggest that the effect of UV‐B radiation is not mediated by phytochrome. An activity spectrum obtained by delivering 1 μmol m −2 s −1 of monochromatic UV radiation against a while light background (63 μmol m −2 s −1 showed maximum effectiveness around 300 nm, which suggests that DNA or aromatic residues in proteins are not the chromophores mediating UV‐B induced inhibition of elongation. Chemicals that affect the normal (photo)chemistry of flavins and possibly pterins (KI, NaN, and phenylacetic acid) largely abolished the inhibitor) effect of broad‐hand UV‐B radiation when applied to the root zone before irradiation. KI was effective at concentrations < 10 −4 M , which have been shown in vitro to be effective in quenching the triplet excited stales of flavins but not fluorescence from pterine or singlet states of flavins. Elimination of blue light or reduction of UV‐A, two sources of flavin excitation, promoted hypocotyl elongation, but did not affect the inhibition of elongation evened by UV‐B. Kl applied after UV‐B irradiation had no effect on the inhibition response. Taken together these findings suggest that the chromophore of the photoreceptor system invoked in UV‐B perception by tomato seedlings during de‐etiolation may be a flavin.

Etiolation

Elongation

Action spectrum

Lycopersicon

Coleoptile

Phytochrome

10.1111/j.1399-3054.1995.tb05104.x

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Citations (130)

Non‐invasive measurements of leaf epidermal transmittance of UV radiation using chlorophyll fluorescence: field and laboratory studies

Physiologia Plantarum (2000)

Paul W. Barnes Peter S. Searles Carlos L. Ballaré Ronald J. Ryel Martyn M. Caldwell

Ratios of chlorophyll fluorescence induced by ultraviolet (UV) and bluegreen (BG) radiation [F(UV)/F(BG)] were determined with a Xe‐PAM fluorometer to test the utility of this technique as a means of non‐intrusively assessing changes in the pigmentation and optical properties of leaves exposed to varying UV exposures under laboratory and field conditions. For plants of Vicia faba and Brassica campestris , grown under controlled‐environmental conditions, F(UV‐B)/F(BG) was negatively correlated with whole‐leaf UV‐B‐absorbing pigment concentrations. Fluorescence ratios of V. faba were similar to, and positively correlated with (r 2 =0.77 [UV‐B]; 0.85 [UV‐A]), direct measurements of epidermal transmittance made with an integrating sphere. Leaves of 2 of 4 cultivars of field‐grown Glycine max exposed to near‐ambient solar UV‐B at a mid‐latitude site (Buenos Aires, Argentina, 34° S) showed significantly lower abaxial F(UV‐B)/F(BG) values (i.e., lower UV‐B epidermal transmittance) than those exposed to attenuated UV‐B, but solar UV‐B reduction had a minimal effect on F(UV‐B)/F(BG) in plants growing at a high‐latitude site (Tierra del Fuego, Argentina, 55° S). Similarly, the exotic Taraxacum officinale did not show significant changes in F(UV‐B)/F(BG) when exposed to very high supplemental UV‐B (biologically effective UV‐B=14–15 kJ m −2 day −1 ) in the field in Tierra del Fuego, whereas a native species, Gunnera magellanica , showed significant increases in F(UV‐B)/F(BG) relative to those receiving ambient UV‐B. These anomalous fluorescence changes were associated with increases in BG‐absorbing pigments (anthocyanins), but not UV‐B‐absorbing pigments. These results indicate that non‐invasive estimates of epidermal transmittance of UV radiation using chlorophyll fluorescence can detect changes in pigmentation and leaf optical properties induced by UV‐B radiation under both field and laboratory conditions. However, this technique may be of limited utility in cold environments where UV and low temperatures can stimulate the production of BG‐absorbing pigments that interfere with these indirect measurements of UV‐transmittance.

Ultraviolet

Fluorometer

10.1034/j.1399-3054.2000.100308.x

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Citations (75)