Plant hormones (Literature sources on phytohormones and plant signalling)

Your new post is loading...

Scooped by Julio Retamales

Scoop.it!

Trichoderma-secreted anthranilic acid promotes lateral root development via auxin signaling and RBOHF-induced endodermal cell wall remodeling

From doi.org - March 30, 5:46 PM

Authors: Yu Chen, Yansong Fu, Yanwei Xia, Youzhi Miao, Jiahui Shao, Wei Xuan, Yunpeng Liu, Weibing Xun, Qiuyan Yan, Qirong Shen and Ruifu Zhang.

Cell Reports (2023)

Editor's view: Chen et al. show that 2-AA, a compound identified from T. guizhouense NJAU4742, promotes plant lateral root development via the canonical auxin pathway as a stimulator and increases ROS deposition in the Casparian strip as an IAA mimic, which finally enhances endodermal cell wall remodeling and facilitates lateral root emergence.

Highlights: • 2-AA identified from T. guizhouense NJAU4742 can promote lateral root development • 2-AA regulates auxin signaling and transport in the canonical auxin pathway • 2-AA enhances endodermal cell wall remodeling via an RBOHF-induced ROS burst

Abstract: "Trichoderma spp. have evolved the capacity to communicate with plants by producing various secondary metabolites (SMs). Nonhormonal SMs play important roles in plant root development, while specific SMs from rhizosphere microbes and their underlying mechanisms to control plant root branching are still largely unknown. In this study, a compound, anthranilic acid (2-AA), is identified from T. guizhouense NJAU4742 to promote lateral root development. Further studies demonstrate that 2-AA positively regulates auxin signaling and transport in the canonical auxin pathway. 2-AA also partly rescues the lateral root numbers of CASP1pro:shy2-2, which regulates endodermal cell wall remodeling via an RBOHF-induced reactive oxygen species burst. In addition, our work reports another role for microbial 2-AA in the regulation of lateral root development, which is different from its better-known role in plant indole-3-acetic acid biosynthesis. In summary, this study identifies 2-AA from T. guizhouense NJAU4742, which plays versatile roles in regulating plant root development."

Julio Retamales's insight:

Relevant contribution!

more...

No comment yet.

Scooped by Julio Retamales

Scoop.it!

Jasmonate signaling drives defense responses against Alternaria alternata in chrysanthemum

From bmcgenomics.biomedcentral.com - September 24, 2023 10:26 AM

Authors: Shuhuan Zhang, Weihao Miao, Ye Liu, Jiafu Jiang, Sumei Chen, Fadi Chen and Zhiyong Guan.

BMC Genomics (2023)

Abstract: "Background - Black spot disease caused by the necrotrophic fungus Alternaria spp. is one of the most devastating diseases affecting Chrysanthemum morifolium. There is currently no effective way to prevent chrysanthemum black spot. Results - We revealed that pre-treatment of chrysanthemum leaves with the methyl jasmonate (MeJA) significantly reduces their susceptibility to Alternaria alternata. To understand how MeJA treatment induces resistance, we monitored the dynamics of metabolites and the transcriptome in leaves after MeJA treatment following A. alternata infection. JA signaling affected the resistance of plants to pathogens through cell wall modification, Ca2+ regulation, reactive oxygen species (ROS) regulation, mitogen‐activated protein kinase cascade and hormonal signaling processes, and the accumulation of anti-fungal and anti-oxidant metabolites. Furthermore, the expression of genes associated with these functions was verified by reverse transcription quantitative PCR and transgenic assays. Conclusion - Our findings indicate that MeJA pre-treatment could be a potential orchestrator of a broad-spectrum defense response that may help establish an ecologically friendly pest control strategy and offer a promising way of priming plants to induce defense responses against A. alternata."

Julio Retamales's insight:

This relevant article was already posted here when published as a preprint.

more...

No comment yet.

Scooped by Julio Retamales

Scoop.it!

The plant cuticle - Primer

From linkinghub.elsevier.com - March 27, 2023 3:14 PM

Authors: Laura González-Valenzuela, Joan Renard, Nathalie Depège-Fargeix and Gwyneth Ingram.

Current Biology (2023)

Abstract: "The plant cuticle is one of the key innovations that allowed plants to colonize terrestrial ecosystems. By limiting molecular diffusion, the cuticle provides an interface that ensures controlled interactions between plant surfaces and their environments. It confers diverse and sometimes astonishing properties upon plant surfaces at both the molecular level (from water and nutrient exchange capacities to almost complete impermeability), to the macroscopic level (from water repellence to iridescence). It takes the form of a continuous modification of the outer cell wall of the plant epidermis from early in plant development (surrounding the epidermis of the developing plant embryo) and is actively maintained and modified throughout the growth and development of most plant aerial organs — including non-woody stems, flowers, leaves, and even the root cap of emerging primary and lateral roots. The cuticle was first identified as a distinct structure in the early 19th century, and has since been the focus of intense research that, while revealing the fundamental role of the cuticle in the life of terrestrial plants, has also highlighted many unresolved mysteries regarding cuticle biogenesis and structure."

more...

No comment yet.

Scooped by Julio Retamales

Scoop.it!

Genetic regulation of the root angle in cereals - Review

From doi.org - February 26, 9:25 AM

Authors: Gwendolyn K. Kirschner, Frank Hochholdinger, Silvio Salvi, Malcolm J. Bennett, Guoqiang Huang and Rahul A. Bhosale.

Trends in Plant Science (2024)

Highlights: The root angle in cereals determines soil resource capture, stress resilience, and yield, especially in suboptimal conditions. Root angle regulation involves competing gravitropic and antigravitropic offset mechanisms. Understanding the mechanisms underlying root angle regulation in cereals is important due to their complex root system made up of distinct root types, formed at different stages of development. Recent studies in cereals revealed genes regulating the root angle. However, the precise mechanisms determining and maintaining root angle in distinct root types remain unclear. Understanding the molecular mechanisms underlying root angle control is essential for incorporating the root angle trait into breeding programs.

Abstract: "The root angle plays a critical role in efficiently capturing nutrients and water from different soil layers. Steeper root angles enable access to mobile water and nitrogen from deeper soil layers, whereas shallow root angles facilitate the capture of immobile phosphorus from the topsoil. Thus, understanding the genetic regulation of the root angle is crucial for breeding crop varieties that can efficiently capture resources and enhance yield. Moreover, this understanding can contribute to developing varieties that effectively sequester carbon in deeper soil layers, supporting global carbon mitigation efforts. Here we review and consolidate significant recent discoveries regarding the molecular components controlling root angle in cereal crop species and outline the remaining research gaps in this field."

Julio Retamales's insight:

Excellent review!

Text of the figure above: "Figure 2. Model illustrating the functioning of gravitropic and antigravitropic components identified in cereal crops at the cellular level. Gravity is mainly perceived in the root cap, where amyloplast sedimentation triggers a signal that is transduced in the outer tissues through the meristematic zone. This signal leads to an asymmetric auxin distribution, which, in turn, causes asymmetric cell elongation in the elongation zone and, consequently, root bending as a gravitropic response. In cereal crops, several proteins have been identified that are involved in the amyloplast sedimentation and creation of the asymmetric auxin distribution. To date, only some components of the antigravitropic response are known: the regulation of the asymmetric auxin distribution and of ROS signaling and cell wall stiffness in the elongation zone. Abbreviation: AF, actin filament."

more...

No comment yet.

Scooped by Julio Retamales

Scoop.it!

Jasmonate signaling drives defense responses against Alternaria alternata in chrysanthemum

From www.researchsquare.com - July 2, 2023 11:25 PM

Authors: Shuhuan Zhang, Weihao Miao, Ye Liu, Jiafu Jiang, Sumei Chen, Fadi Chen and Zhiyong Guan.

Research Square (2023)

Abstract: "Background - Black spot disease caused by the necrotrophic fungus Alternaria spp. is one of the most devastating diseases affecting Chrysanthemum morifolium. There is currently no effective way to prevent chrysanthemum black spot. Results - We revealed that pre-treatment of chrysanthemum leaves with the plant hormone jasmonate (JA) significantly reduces their susceptibility to Alternaria alternata. To understand how JA treatment induces resistance, we monitored the dynamics of metabolites and the transcriptome in leaves after JA treatment following A. alternata infection. JA signaling affected the resistance of plants to pathogens through cell wall modification, Ca2+ regulation, reactive oxygen species (ROS) regulation, mitogen-activated protein kinase cascade and hormonal signaling processes, and the accumulation of anti-fungal and anti-oxidant metabolites. Furthermore, the expression of genes associated with these functions was verified by reverse transcription quantitative PCR and transgenic assays. Conclusion - Our findings indicate that JA pre-treatment could be a potential orchestrator of a broad-spectrum defense response that may help establish an ecologically friendly pest control strategy and offer a promising way of priming plants to induce defense responses against A. alternata.

more...

No comment yet.