Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Botany A complex branched carbohydrate commonly associated with sieve areas of sieve elements.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A plant polysaccharide comprising glucose residues linked together through β-1,3-linkages, produced chiefly in response to wounding and infection.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Furnished with protuberant or hardened spots.

from The Century Dictionary and Cyclopedia

  • In botany and zoology, having callosities or hard spots; callous; hardened.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

From Latin callōsus, callous; see callous.

Examples

  • Aniline blue staining was carried out to reveal phloem-associated callose in cotyledons and true leaves.

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  • Merged bright-field and aniline-blue stained UV fluorescence images showing the correspondence between xylem and phloem-associated callose

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  • To visualize callose in sieve tube elements in seedlings, aniline blue was used according to

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  • The hyd mutants exhibit ectopic lignin and callose accumulation (Fig. S1), showing a dissociation between cell patterning and wall biochemistry.

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  • Substantial ectopic callose deposition is found, variably associated with xylem traces; bars = 100 µm.

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  • Mauch-Mani B (2004) β-Amionobutyric acid induced resistance against necrotrophic pathogens is based on ABA-dependent priming of callose.

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  • Apart from degraded chitins and glucans, callose also acts as a positive regulator of the hypersensitive response

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  • Conversely, in the case of compatible reactions between susceptible hosts and pathogens, β, 1-3 glucanase-induced callose degradation facilitates the absorption of nutrients by haustoria and promotes growth and sporulation

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  • Fig. S1A), in the hyd mutants callose accumulates ectopically, and is variably associated with xylem traces showing a lack of coordinated differentiation of the two vascular cell types (Supplementary

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