Grape cell walls could explain their susceptibility to fungal disease.Continue reading Grapes, mind the (cell wall) barricades against grey mould!
Noccaea caerulescens has some tricks that help it cope with heavy metals.Continue reading Microscopes and roots: investigating whether cell wall thickenings are phi (Φ) or “C” shaped
Being rooted, plants have very little opportunity to travel. They can as pollen to find a mate, and also as seeds. In the case of Cardamine hirsuta, that travel is explosive. The plant stores energy in the pericarp of the fruit. When fruit pod fractures, all that energy is released in one moment, flinging the seeds up to five metres away. While there has been research on the mechanism for explosive seed dispersal, there hasn’t been so much work on how the seeds are adapted. Until now. Ulla Neumann and Angela Hay have examined the seeds of Cardamine hirsuta microscopically,...Continue reading A close-up view of Cardmine hirsuta’s flight jacket
The mechanism requires a day or two from exposure to exclude the metal from the intracellular compartment.Continue reading Delayed aluminium exclusion in signal grass is energy-dependent
Composition and physicochemical properties of outer mucilage from seeds of Arabidopsis natural accessions
Poulain et al. present a dataset describing six traits for polysaccharides extracted from the outer mucilage for 306 natural Arabidopsis thaliana accessions.Continue reading Composition and physicochemical properties of outer mucilage from seeds of Arabidopsis natural accessions
Changes in the arrangement of cell wall components determine cell wall properties (integrity, stiffness), thereby affecting the macro properties of fruits, which are important for consumers and industry. The immunocytochemical study was conducted to elucidate the distribution of arabinogalactan proteins (AGPs) and pectic polysaccharides contained in apple (Malus x domestica) fruits during senescence process. Microscopy observations showed spatio-temporal changes in the localization and dependencies between all examined constituents. Leszczuk et al. propose that AGPs are involved in establishment of the cell wall – plasma membrane continuum.Continue reading Arabinogalactan proteins (AGPs) and pectins in apple fruits during postharvest storage
The protein complex ARP2/3 is responsible for nucleating actin, and its loss results in multiple defects in young seedlings of Arabidopsis thaliana. Sahi et al. show that plants lacking the ARP2/3 complex have defects associated with cell wall synthesis. Mature tissues of inflorescence stems contain less cellulose and more homogalacturonan, cell walls are thinner, and lignification is altered. Stems of mutant plants have reduced basipetal auxin transport and a changed auxin influx carrier (AUX1) expression pattern. Since cell wall composition and auxin transport are functionally connected, morphogenetic defects may be explained by ARP2/3 control of cell wall synthesis and/or auxin...Continue reading ARP2/3 complex links cell wall assembly and auxin distribution
Marcos Buckeridge explains how death and destruction in sugarcane roots can lead to the development of gas spaces, which improve root function.Continue reading Creative Destruction: How Death Leads to Function
Seeking to uncover the effects of ethylene on the metabolic process and pectin remobilising capacity of rice (Oryza sativa) that is grown in phosphorus (P)-deficient conditions, Zhu et al. find that ethylene positively regulates the cell wall pectin content of two rice cultivars. Mediated by the expression of OsPT2, more soluble P was released to the root and translocated to the shoots, and more recycled soluble P and ethylene content was found in cultivar Nipponbare, compared with Kasalath. This paper is part of the Root Biology Special Issue.Continue reading Ethylene affects cell wall remobilisation
How, in molecular terms, does the vital interaction between pollen pollen and pistil work?Continue reading How does the vital interaction between pollen and pistil work?
Aluminium (Al) toxicity is one of the factors limiting crop production on acid soils and various resistance mechanisms have evolved in plant species. Cell-wall pectin content is generally lower in Al-resistant than in Al-sensitive cultivars, and the degree of methylation of the pectins may play an important role in resistance.Continue reading Cell-wall pectin and Al resistance