How Do Lettuce Seedlings Adapt to Low-pH Stress Conditions? A Mechanism for Low-pH-Induced Root Hair Formation in Lettuce Seedlings

Takahashi, Hidenori

doi:10.1007/978-3-642-25829-9_6

Cited by 5 publications

(3 citation statements)

References 228 publications

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“…Plant growth and development require the tight coordination of cell elongation, expansion and division (Harashima and Schnittger, 2010), and each of these processes depends on pH both inside and outside the cell (Felle, 2001). For example, normal root hair growth requires tight pH regulation that can be perturbed by localized changes in cytoplasmic and apoplastic pH (Bibikova et al ., 1998; Wu et al ., 2007; Pena et al ., 2012; Takahashi, 2012). In root cells, apoplastic pH plays a role in auxin‐mediated growth (Barbez et al ., 2017), mechanosensing (Monshausen et al ., 2009) and gravitropism (Monshausen et al ., 2011).…”

Section: Introductionmentioning

confidence: 99%

Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition

et al. 2020

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Acidification of the apoplastic space facilitates cell wall loosening and is therefore a key step in cell expansion. PSY1 is a growth-promoting secreted tyrosine-sulfated glycopeptide whose receptor directly phosphorylates and activates the plasma membrane H +-ATPase, which results in acidification and initiates cellular expansion. Although the mechanism is not clear, the Rapid Alkalinization Factor (RALF) family of small, secreted peptides inhibits the plasma membrane H +-ATPase, leading to alkalinization of the apoplastic space and reduced growth. Here we show that treating Arabidopsis thaliana roots with PSY1 induced the transcription of genes encoding the RALF peptides RALF33 and RALFL36. A rapid burst of intracellular Ca 2+ preceded apoplastic alkalinization in roots triggered by RALFs, with peptide-specific signatures. Ca 2+ channel blockers abolished RALF-induced alkalinization, indicating that the Ca 2+ signal is an obligatory part of the response and that it precedes alkalinization. As expected, fer mutants deficient in the RALF receptor FERONIA did not respond to RALF33. However, we detected both Ca 2+ and H + signatures in fer mutants upon treatment with RALFL36. Our results suggest that different RALF peptides induce extracellular alkalinization by distinct mechanisms that may involve different receptors.

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Section: Introductionmentioning

confidence: 99%

Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition

et al. 2020

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“…Proper root hair formation is central to the rhizophagy cycle, as root hair tips are the location of bacterial expulsion from the host plant. In certain hydroponic growth conditions, the root hair formation of some plants (i.e., lettuce) is greatly reduced [ 28 , 29 ]. Specifically, adequate P levels in hydroponic solutions may reduce root hair density [ 30 ].…”

Section: Plant-associated Bacteriamentioning

confidence: 99%

Plant Beneficial Bacteria and Their Potential Applications in Vertical Farming Systems

Chiaranunt

White

2023

Plants

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In this literature review, we discuss the various functions of beneficial plant bacteria in improving plant nutrition, the defense against biotic and abiotic stress, and hormonal regulation. We also review the recent research on rhizophagy, a nutrient scavenging mechanism in which bacteria enter and exit root cells on a cyclical basis. These concepts are covered in the contexts of soil agriculture and controlled environment agriculture, and they are also used in vertical farming systems. Vertical farming—its advantages and disadvantages over soil agriculture, and the various climatic factors in controlled environment agriculture—is also discussed in relation to plant–bacterial relationships. The different factors under grower control, such as choice of substrate, oxygenation rates, temperature, light, and CO2 supplementation, may influence plant–bacterial interactions in unintended ways. Understanding the specific effects of these environmental factors may inform the best cultural practices and further elucidate the mechanisms by which beneficial bacteria promote plant growth.

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“…In most of these studies, the involvement of phytohormones was evaluated and focused on the phytohormonal responses to aluminum (Al) toxicity (Massot et al 2002 ;Shen et al 2004 ;Reyna-Llorens et al 2014 ;Zhou et al 2014 ). However, the negative effects of low pH stress (or high H + toxicity) on plant growth and phytohormones are less known and documented (Takahashi 2012 ). However, the negative effects of low pH stress (or high H + toxicity) on plant growth and phytohormones are less known and documented (Takahashi 2012 ).…”

Section: Phytohormonal Responses To Soil Aciditymentioning

confidence: 99%

Plant Hormones under Challenging Environmental Factors

Ahammed¹,

Yu²

2016

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How Do Lettuce Seedlings Adapt to Low-pH Stress Conditions? A Mechanism for Low-pH-Induced Root Hair Formation in Lettuce Seedlings

Cited by 5 publications

References 228 publications

Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition

Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition

Plant Beneficial Bacteria and Their Potential Applications in Vertical Farming Systems

Plant Hormones under Challenging Environmental Factors

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How Do Lettuce Seedlings Adapt to Low-pH Stress Conditions? A Mechanism for Low-pH-Induced Root Hair Formation in Lettuce Seedlings

Cited by 5 publications

References 228 publications

Evidence for multiple receptors mediating RALF‐triggered Ca2+ signaling and proton pump inhibition

Evidence for multiple receptors mediating RALF‐triggered Ca2+ signaling and proton pump inhibition

Plant Beneficial Bacteria and Their Potential Applications in Vertical Farming Systems

Plant Hormones under Challenging Environmental Factors

Contact Info

Product

Resources

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Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition

Evidence for multiple receptors mediating RALF‐triggered Ca²⁺ signaling and proton pump inhibition