Guard cell apoplastic photosynthate accumulation corresponds to a phloem-loading mechanism

Journal of Experimental Botany
Yun KangKimberly A Riddle

Abstract

Apoplastic phloem loaders have an apoplastic step in the movement of the translocated sugar, prototypically sucrose, from the mesophyll to the companion cell-sieve tube element complex. In these plants, leaf apoplastic sucrose becomes concentrated in the guard cell wall to nominally 150 mM by transpiration during the photoperiod. This concentration of external sucrose is sufficient to diminish stomatal aperture size in an isolated system and to regulate expression of certain genes. In contrast to apoplastic phloem loaders and at the other extreme, strict symplastic phloem loaders lack an apoplastic step in phloem loading and mostly transport raffinose family oligosaccharides (RFOs), which are at low concentrations in the leaf apoplast. Here, the effects of the phloem-loading mechanism and associated phenomena on the immediate environment of guard cells are reported. As a first step, carbohydrate analyses of phloem exudates confirmed basil (Ocimum basilicum L. cv. Minimum) as a symplastic phloem-loading species. Then, aspects of stomatal physiology of basil were characterized to establish this plant as a symplastic phloem-loading model species for guard cell research. [(14)C]Mannitol fed via the cut petiole accumulated around gu...Continue Reading

Citations

Jan 18, 2016·Current Biology : CB·Daniel HorrerDiana Santelia
Dec 17, 2008·The New Phytologist·Tracy Lawson
Oct 18, 2011·Plant, Cell & Environment·Werner C AntunesMarcelo E Loureiro
Aug 26, 2009·Plant Signaling & Behavior·Alexandra Cu FurchAart Je van Bel
Mar 23, 2010·Current Opinion in Plant Biology·Christina Kühn, Christopher P L Grof
Apr 10, 2016·The New Phytologist·Danilo M DalosoAlisdair R Fernie
Mar 16, 2018·The Plant Journal : for Cell and Molecular Biology·David B MedeirosAlisdair R Fernie
Oct 13, 2018·PloS One·Jayaram KottapalliDavid Granot
Aug 2, 2018·Plant Signaling & Behavior·V F LimaD M Daloso
Apr 9, 2017·The Plant Journal : for Cell and Molecular Biology·Gilor KellyDavid Granot
Jan 8, 2021·BMC Plant Biology·Massimiliano TrentiFrancesco Emanuelli
Dec 22, 2020·Frontiers in Plant Science·Juan YangHongbin Wei
Aug 17, 2021·Frontiers in Plant Science·Olga V VoitsekhovskajaOlga A Koroleva

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.