Auxin-Dependent Cell Elongation During the Shade Avoidance Response

Ma, Lin; Li, Gang

doi:10.3389/fpls.2019.00914

Cited by 64 publications

(65 citation statements)

References 85 publications

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“…A study of elongation of the hypocotyl in Arabidopsis under shade shows that cotyledon-derived auxin is necessary to initiate hypocotyl growth [23]. In our study, elongation was associated with an increase in auxin levels in leaves, which suggests that shade induces a crosstalk within hormones [44] and the auxin promotes elongation under shade [49]. Our analysis of gene regulation in multiple plant hormone signal pathways revealed that the growth promoting hormones auxin, gibberellin, brassinosteroid, cytokinine and senescing hormones of abscisic acid and ethylene were all stimulated under shade treatment.…”

Section: Discussionsupporting

confidence: 55%

Shade Effects on Peanut Yield Associate with Physiological and Expressional Regulation on Photosynthesis and Sucrose Metabolism

Chen

Zhang

Zeng

et al. 2020

IJMS

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Intercropping improves land utilization with more crops grown together; however, shorter crops in intercropping experience stress, being shaded by the taller crops. Systematic changes in phenotype, physiology, yield, and gene regulation under shade stress in peanut are largely unknown, although shade responses have been well analyzed in model plants. We exposed peanut plants to simulated 40% and 80% shade for 15 and 30 days at the seedling stage, flowering stage, and both stages. Shade caused the increased elongation growth of the main stem, internode, and leaf, and elongation was positively associated with auxin levels. Shade stress reduced peanut yield. Further comparative RNA-seq analyses revealed expressional changes in many metabolism pathways and common core sets of expressional regulations in all shade treatments. Expressional downregulation of most genes for light-harvesting and photosynthesis agreed with the observed decreased parameters of photosynthesis processes. Other major regulations included expressional downregulation of most core genes in the sucrose and starch metabolism, and growth-promoting genes in plant hormone signal pathways. Together, the results advance our understanding of physiological and molecular regulation in shade avoidance in peanut, which could guide the breeding designing in the intercropping system.

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Section: Discussionsupporting

confidence: 55%

Shade Effects on Peanut Yield Associate with Physiological and Expressional Regulation on Photosynthesis and Sucrose Metabolism

Chen

Zhang

Zeng

et al. 2020

IJMS

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“…Other genes regulating shade avoidance responses at the organ and whole plant levels are also overexpressed in purple basil. This is the case with AUXIN RESPONSE 4 (AXR4), an activator of the Auxin Influx Carrier Protein 1 (AUX1, Dharmasiri et al, 2006), that induces hypocotyl elongation (Ma & Li, 2019), and of BYPASS 1 (BPS1), whose overexpression promotes both apical dominance and leaf expansion (Lee, Parrott, Adhikari, Fraser, & Sieburth, 2016). It is also true of LONGIFOLIA 1, LONGIFOLIA 2 and a set of EXPANSINs (EXP 1,4,8,10), all of which are known to be involved in shade avoidance responses (Christie, 2007;Sasidharan, Chinnappa, Voesenek, & Pierik, 2008 (Hu, Xie, & Chua, 2003;.…”

Section: Dissecting Molecular Events At the Base Of The Shade Naturmentioning

confidence: 99%

Unveiling the shade nature of cyanic leaves: A view from the “blue absorbing side” of anthocyanins

Landi

Agati

Fini

et al. 2020

Plant Cell & Environment

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Anthocyanins have long been suggested as having great potential in offering photoprotection to plants facing high light irradiance. Nonetheless, their effective ability in protecting the photosynthetic apparatus from supernumerary photons has been questioned by some authors, based upon the inexact belief that anthocyanins almost exclusively absorb green photons, which are poorly absorbed by chlorophylls. Here we focus on the blue light absorbing features of anthocyanins, a neglected issue in anthocyanin research. Anthocyanins effectively absorb blue photons: the absorbance of blue relative to green photons increases from tri-to mono-hydroxy Bring substituted structures, reaching up to 50% of green photons absorption. We offer a comprehensive picture of the molecular events activated by low blue-light availability, extending our previous analysis in purple and green basil, which we suggest to be responsible for the "shade syndrome" displayed by cyanic leaves. While purple leaves display overexpression of genes promoting chlorophyll biosynthesis and light harvesting, in green leaves it is the genes involved in the stability/repair of photosystems that are largely overexpressed. As a corollary, this adds further support to the view of an effective photoprotective role of anthocyanins. We discuss the profound morpho-anatomical adjustments imposed by the epidermal anthocyanin shield, which reflect adjustments in light harvesting capacity under imposed shade and make complex the analysis of the photosynthetic performance of cyanic versus acyanic leaves.

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“…In the past decade, shade related research was carried out mainly in Arabidopsis , and indicated a crucial role of auxin in the shade avoidance response ( Sessa et al, 2018 ). In the Arabidopsis seedlings, auxin accumulates in response to shade resulting in hypocotyl cells elongation ( Ma and Li, 2019 ). A low R:FR ratio (as in case of shade) has been found to promote petiole elongation in Arabidopsis ( Roig-Villanova and Martínez-García, 2016 ).…”

Section: Hormonal Regulation Of Plant Development In Darkmentioning

confidence: 99%

Dark-Induced Hormonal Regulation of Plant Growth and Development

et al. 2020

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The sessile nature of plants has made them extremely sensitive and flexible toward the constant flux of the surrounding environment, particularly light and dark. The light is perceived as a signal by specific receptors which further transduce the information through the signaling intermediates and effector proteins to modulate gene expression. Signal transduction induces changes in hormone levels that alters developmental, physiological and morphological processes. Importance of light for plants growth is well recognized, but a holistic understanding of key molecular and physiological changes governing plants development under dark is awaited. Here, we describe how darkness acts as a signal causing alteration in hormone levels and subsequent modulation of the gene regulatory network throughout plant life. The emphasis of this review is on dark mediated changes in plant hormones, regulation of signaling complex COP/DET/FUS and the transcription factors PIFs which affects developmental events such as apical hook development, elongated hypocotyls, photoperiodic flowering, shortened roots, and plastid development. Furthermore, the role of darkness in shade avoidance and senescence is discussed.

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Auxin-Dependent Cell Elongation During the Shade Avoidance Response

Cited by 64 publications

References 85 publications

Shade Effects on Peanut Yield Associate with Physiological and Expressional Regulation on Photosynthesis and Sucrose Metabolism

Shade Effects on Peanut Yield Associate with Physiological and Expressional Regulation on Photosynthesis and Sucrose Metabolism

Unveiling the shade nature of cyanic leaves: A view from the “blue absorbing side” of anthocyanins

Dark-Induced Hormonal Regulation of Plant Growth and Development

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