Tagged: pectin



A close-up view of Cardmine hirsuta’s flight jacket

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,...

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Apple and cells

Arabinogalactan proteins (AGPs) and pectins in apple fruits during postharvest storage

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.

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A diagram of the paper

ARP2/3 complex links cell wall assembly and auxin distribution

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...

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Oryza sativa

Ethylene affects cell wall remobilisation

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.

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