'plant cell death' in Plant hormones (Literature sources on phytohormones and plant signalling)

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The swansong of petal cell death: Insights into the mechanism and regulation of ethylene-mediated flower senescence - Review

From academic.oup.com - June 10, 2023 9:39 PM

Authors: Shazia Parveen, Foziya Altaf, Sumira Farooq, Mohammad Lateef Lone, Aehsan ul Haq and Inayatullah Tahir.

Journal of Experimental Botany (2023)

Abstract: "Flower senescence is a fundamental aspect of the developmental trajectory in flowers, occurring after the differentiation of tissues, maturation of petals and preceding the growth and development of seeds. It is accompanied by various alterations at the cytological, physiological and molecular levels, similar to other forms of programmed cell death (PCD). It involves an intricate interplay of various plant growth regulators, with ethylene being the key orchestrator in ethylene-dependent petal senescence. Petal senescence mediated by ethylene is marked by various changes like petal wilting, amplified oxidative stress, degradation of proteins and nucleic acids and autophagy. Ethylene crosstalks with other growth regulators and triggers genetic and/or epigenetic reprogramming of genes during senescence in flowers. While our understanding of the mechanism and regulation of petal senescence in ethylene-sensitive species has advanced, significant knowledge gaps still exist, which demand critical reappraisal of the available literature on the topic. A deeper understanding of the various mechanisms and regulatory pathways involved in ethylene-dependent senescence has the capacity to facilitate a more precise regulation of the timing and site of senescence, thus leading to optimized crop yields, enhanced product quality and extended longevity."

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Nitric oxide and hydrogen sulfide: an indispensable combination for plant functioning - Review

From linkinghub.elsevier.com - August 20, 2021 11:17 PM

Authors: Vipul Mishra, Pooja Singh, Durgesh Kumar Tripathi, Francisco J. Corpas and Vijay Pratap Singh.

Trends in Plant Science (2021)

Highlights: NO and H2S have signaling properties through protein post-translational modifications (PTMs) and by their crosstalk with other cellular compounds, including phytohormones, hydrogen peroxide, or calcium, among others. NO and H2S regulate protein function mainly by cysteine thiol-based redox switches (S-nitrosation and persulfidation, respectively) that compete with each other and with other PTMs (S-glutathionylation, S-cyanylation, S-acylation, and S-sulfenylation). The prevalence of one will depend on the subcellular and cellular redox context, which in turn will depend on the physiological or stress situation in which it occurs. NO and H2S can function in a coordinated way in certain signaling cascades, although there are processes in which they do so independently.

Abstract: "Nitric oxide (NO) and hydrogen sulfide (H2S) are gasotransmitters, which are involved in almost all plant physiological and stress-related processes. With its antioxidant regulatory properties, NO on its own ameliorates plant stress, while H2S, a foul-smelling gas, has differential effects. Recent studies have shown that these signaling molecules are involved in intertwined pathway networks. This is due to the contrasting effects of NO and H2S depending on cell type, subcellular compartment, and redox status, as well as the flux and dosage of NO and H2S in different plant species and cellular contexts. Here, we provide a comprehensive review of the complex networks of these molecules, with particular emphasis on root development, stomatal movement, and plant cell death."

Julio Retamales's insight:

This review can be related with the one by Liu et al. ("Cross-Talk between Hydrogen Peroxide and Nitric Oxide during Plant Development and Responses to Stress") posted below.

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The RPN12a proteasome subunit is essential for the multiple hormonal homeostasis controlling the progression of leaf senescence

From www.nature.com - September 30, 2022 10:39 AM

Authors: Clément Boussardon, Pushan Bag, Marta Juvany, Jan Šimura, Karin Ljung, Stefan Jansson and Olivier Keech.

Communications Biology (2022)

Editor's view: A loss-of-function mutation in the RPN12a proteasome subunit in Arabidopsis thaliana shows that this protein is essential for hormonal homeostasis, thereby modulating plant’s development and the progression of leaf senescence.

Abstract: "The 26S proteasome is a conserved multi-subunit machinery in eukaryotes. It selectively degrades ubiquitinated proteins, which in turn provides an efficient molecular mechanism to regulate numerous cellular functions and developmental processes. Here, we studied a new loss-of-function allele of RPN12a, a plant ortholog of the yeast and human structural component of the 19S proteasome RPN12. Combining a set of biochemical and molecular approaches, we confirmed that a rpn12a knock-out had exacerbated 20S and impaired 26S activities. The altered proteasomal activity led to a pleiotropic phenotype affecting both the vegetative growth and reproductive phase of the plant, including a striking repression of leaf senescence associate cell-death. Further investigation demonstrated that RPN12a is involved in the regulation of several conjugates associated with the auxin, cytokinin, ethylene and jasmonic acid homeostasis. Such enhanced aptitude of plant cells for survival in rpn12a contrasts with reports on animals, where 26S proteasome mutants generally show an accelerated cell death phenotype."

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