Auxin Coordinates Shoot and Root Development During Shade Avoidance Response

Ruzza, Valentino; Sessa, Giovanna; Sassi, Massimiliano; Morelli, Giorgio; Ruberti, Ida

doi:10.1007/978-3-7091-1526-8_17

Cited by 13 publications

(27 citation statements)

References 119 publications

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“…Prolonged exposure to Low R/FR leads to the accumulation of HFR1/SICS1 and the formation of non-active heterodimers with PIF4 and PIF5 [33,34]. Consistently, several genes rapidly and transiently induced by Low R/FR are up-regulated in loss-of-function hfr1/sics1 mutants under persistent shade [33,35]. Moreover, hfr1/sics1 plants display an exaggerated shade avoidance response whereas transgenic seedlings overexpressing a stable HFR1/SICS1 protein have suppressed elongation [33,36].…”

Section: Introductionmentioning

confidence: 84%

“…Evidences are accumulating that ATHB2 and its homologs are key regulators of the shade avoidance response, at least in Arabidopsis. Indeed, the overexpression of different members of the HD-Zip II family phenocopies the effect of shade light on distinct organs and flowering even when the plants are grown in High R/FR [26,27,35,117,124,128]. On the contrary, single and double loss-of-function HD-Zip II mutants display altered growth responses to shade both in the hypocotyl and in the leaf [28,128,132].…”

Section: Discussionmentioning

confidence: 99%

“…Auxin has a key role in many aspects of the shade avoidance response, such as increased elongation of stem-like organs (including hypocotyl and petioles), reduced leaf and root growth. Auxin homeostasis, transport and signaling are all regulate in response to shade [35,71]. Interestingly, it has been shown that whereas the increase in auxin synthesis is a major event at the early stages of shade avoidance, persistence of shade mainly result in modulation of auxin sensitivity [25,[72][73][74].…”

Section: Auxin In the Control Of The Shade Avoidance Responsementioning

confidence: 99%

“…In the hat3 athb4 double loss-of-function mutant hypocotyl elongation is impaired [128] whereas overexpression of HAT1, HAT2, HAT3, and ATHB4 results in phenotypes similar to those caused by elevated levels of ATHB2 in High R/FR [26,35,117,124,128], further highlighting the redundancy of Very recent work has shown that prolonged shade results in early exit from proliferation in the first and second leaves of Arabidopsis and that this process requires the HD-Zip II proteins ATHB2 and ATHB4 (Figure 4) [132]. Furthermore, evidence has been provided that the ATHB2 and ATHB4 proteins function as a complex in the regulation of leaf development during shade avoidance, likely forming heterodimers as suggested by yeast two-hybrid assays [132,133].…”

Section: Hd-zips IImentioning

confidence: 99%

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Multiple Pathways in the Control of the Shade Avoidance Response

Sessa

Carabelli

Possenti³

et al. 2018

Preprint

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Plants have evolved two opposing strategies in response to competition for light: shade tolerance and shade avoidance. To detect the presence of neighboring vegetation, shade-avoiding plants have evolved the ability to perceive and integrate multiple signals. Among them, changes in light quality and quantity are central to elicit and regulate the shade avoidance response. Here, we describe recent advances in the understanding of photoperception and downstream signaling mechanisms underlying the shade avoidance response, focusing on Arabidopsis because most of our knowledge derives from studies conducted in this model plant. Shade avoidance is an adaptive response, resulting in phenotypes with high relative fitness in natural dense communities. However, it contributes to reduction in crop plant productivity, and the design of new strategies aimed at attenuating shade avoidance in a stage-and/or organ-specific manner in high-density crop plantings is a major challenge for the future. For this reason, in this review, we also report on recent advances in the molecular description of the shade avoidance response in crops, such as maize and tomato, and discuss similarity and differences with Arabidopsis.

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Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Auxin In the Control Of The Shade Avoidance Responsementioning

confidence: 99%

Section: Hd-zips IImentioning

confidence: 99%

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Multiple Pathways in the Control of the Shade Avoidance Response

Sessa

Carabelli

Possenti³

et al. 2018

Preprint

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“…Plant hormones play key defensive roles under stress conditions, from which the plant may attempt to escape by enduring various physiological functions. Normally, plant hormones act as central integrators that connect and re-program the composite developmental and stress adoptive signaling cascade (Ruzza et al 2014). In this study, the hormonal level, including auxin (IAA;…”

Section: Plant Hormone Signal Transduction Pathway Under Drought Strementioning

confidence: 99%

Insights into grapevine defense response against drought as revealed by biochemical, physiological and RNA-Seq analysis

Salman

Zhang

Kurjogi

et al. 2016

Preprint

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Grapevine is economically important and widely cultivated fruit crop, which is seriously 1 1 hampered by drought worldwide. It is necessary to understand the impact of glitches incurred by 1 2 the drought on grapevine genetic resources. Therefore, in the present study RNA-sequencing were known to be induced in the present study in response to drought. Overall the present study 2 2 concludes that these DEGs play both positive and negative role in drought tolerance by

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ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds

Tognacca

Carabelli

Morelli

et al. 2021

Sci Rep

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The germination timing of seeds is of the utmost adaptive importance for plant populations. Light is one of the best characterized factors promoting seed germination in several species. The germination is also finely regulated by changes in hormones levels, mainly those of gibberellin (GA) and abscisic acid (ABA). Here, we performed physiological, pharmacological, and molecular analyses to uncover the role of ATHB2, an HD-ZIP II transcription factor, in germination of Arabidopsis seeds. Our study demonstrated that ATHB2 is a negative regulator and sustains the expression of transcription factors to block germination promoted by light. Besides, we found that ATHB2 increases ABA sensitivity. Moreover, ABA and auxin content in athb2-2 mutant is higher than wild-type in dry seeds, but the differences disappeared during the imbibition in darkness and the first hours of exposition to light, respectively. Some ABA and light transcription factors are up-regulated by ATHB2, such as ABI5, ABI3, XERICO, SOMNUS and PIL5/PIF1. In opposition, PIN7, an auxin transport, is down-regulated. The role of ATHB2 as a repressor of germination induced by light affecting the gemination timing, could have differential effects on the establishment of seedlings altering the competitiveness between crops and weeds in the field.

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Auxin Coordinates Shoot and Root Development During Shade Avoidance Response

Cited by 13 publications

References 119 publications

Multiple Pathways in the Control of the Shade Avoidance Response

Multiple Pathways in the Control of the Shade Avoidance Response

Insights into grapevine defense response against drought as revealed by biochemical, physiological and RNA-Seq analysis

ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds

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