Plant Proton Pumps: Regulatory Circuits Involving H+-ATPase and H+-PPase

Fuglsang, Anja Thoe; Páez-Valencia, Julio; Gaxiola, Roberto A.

doi:10.1007/978-3-642-14369-4_2

Cited by 38 publications

(38 citation statements)

References 126 publications

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“…The vacuolar H + -ATPase is encoded by multiple genes coding for distinct essential subunits while the vacuolar H + -pyrophosphatase can be generated by a single gene. Additionally, both of these may have variable gene copy numbers for each subunit or protein in different species (Silva and Gerós, 2009; Fuglsang et al, 2011; Volkov, 2015). For example, salt gland bladder cells in Mesembryanthemum crystallinum in response to salt stress showed significantly higher expression for 10 transcripts coding for different subunits of the vacuolar H + -ATPase, while two transcripts likely encoding two copies for the vacuolar H + -pyrophosphatase showed downregulation (Oh et al, 2015).…”

Section: Could We Engineer Working Salt Glands In a Model System?mentioning

confidence: 99%

Making Plants Break a Sweat: the Structure, Function, and Evolution of Plant Salt Glands

Dassanayake

Larkin

2017

Front. Plant Sci.

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Salt stress is a complex trait that poses a grand challenge in developing new crops better adapted to saline environments. Some plants, called recretohalophytes, that have naturally evolved to secrete excess salts through salt glands, offer an underexplored genetic resource for examining how plant development, anatomy, and physiology integrate to prevent excess salt from building up to toxic levels in plant tissue. In this review we examine the structure and evolution of salt glands, salt gland-specific gene expression, and the possibility that all salt glands have originated via evolutionary modifications of trichomes. Salt secretion via salt glands is found in more than 50 species in 14 angiosperm families distributed in caryophyllales, asterids, rosids, and grasses. The salt glands of these distantly related clades can be grouped into four structural classes. Although salt glands appear to have originated independently at least 12 times, they share convergently evolved features that facilitate salt compartmentalization and excretion. We review the structural diversity and evolution of salt glands, major transporters and proteins associated with salt transport and secretion in halophytes, salt gland relevant gene expression regulation, and the prospect for using new genomic and transcriptomic tools in combination with information from model organisms to better understand how salt glands contribute to salt tolerance. Finally, we consider the prospects for using this knowledge to engineer salt glands to increase salt tolerance in model species, and ultimately in crops.

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Section: Could We Engineer Working Salt Glands In a Model System?mentioning

confidence: 99%

Making Plants Break a Sweat: the Structure, Function, and Evolution of Plant Salt Glands

Dassanayake

Larkin

2017

Front. Plant Sci.

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“…alfalfa, barley, cotton, maize, rice, among others) (Fuglsang et al, 2011;Gaxiola et al, 2012 and references therein). Furthermore, increases in shoot and root biomass, yield, root acidification capacity, and nutrient use efficiencies were also reported (Fuglsang et al, 2011; M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT Gaxiola et al, 2012 and references therein). These latter phenotypes are not well explained by the traditional model of type I H + -PPases operating solely at the tonoplast to help energize the vacuole.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

Plant H+-PPases: Reversible Enzymes with Contrasting Functions Dependent on Membrane Environment

et al. 2016

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“…Hence, acidification of the periarbuscular space by the fungus is not sufficient in itself to provide the proton-motive force across the periarbuscular membrane for phosphate uptake into the plant. Since the activity of the plasma membrane ATPase is tightly regulated by means of autoinhibition (Duby and Boutry, 2009;Ekberg et al, 2010;Fuglsang et al, 2011), it is possible that fungal proton pumping activity was low under our experimental conditions.…”

Section: This Is a Representative Experiments That Was Repeated Three mentioning

confidence: 99%

A H+-ATPase That Energizes Nutrient Uptake during Mycorrhizal Symbioses in Rice and Medicago truncatula

et al. 2014

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Most plant species form symbioses with arbuscular mycorrhizal (AM) fungi, which facilitate the uptake of mineral nutrients such as phosphate from the soil. Several transporters, particularly proton-coupled phosphate transporters, have been identified on both the plant and fungal membranes and contribute to delivering phosphate from fungi to plants. The mechanism of nutrient exchange has been studied in plants during mycorrhizal colonization, but the source of the electrochemical proton gradient that drives nutrient exchange is not known. Here, we show that plasma membrane H + -ATPases that are specifically induced in arbuscule-containing cells are required for enhanced proton pumping activity in membrane vesicles from AM-colonized roots of rice (Oryza sativa) and Medicago truncatula. Mutation of the H + -ATPases reduced arbuscule size and impaired nutrient uptake by the host plant through the mycorrhizal symbiosis. Overexpression of the H + -ATPase Os-HA1 increased both phosphate uptake and the plasma membrane potential, suggesting that this H + -ATPase plays a key role in energizing the periarbuscular membrane, thereby facilitating nutrient exchange in arbusculated plant cells.

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Plant Proton Pumps: Regulatory Circuits Involving H+-ATPase and H+-PPase

Cited by 38 publications

References 126 publications

Making Plants Break a Sweat: the Structure, Function, and Evolution of Plant Salt Glands

Making Plants Break a Sweat: the Structure, Function, and Evolution of Plant Salt Glands

Plant H+-PPases: Reversible Enzymes with Contrasting Functions Dependent on Membrane Environment

A H+-ATPase That Energizes Nutrient Uptake during Mycorrhizal Symbioses in Rice and Medicago truncatula

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