Unplugging the callose plug from sieve pores

Bo Xie; Zonglie Hong

doi:10.4161/psb.6.4.14653

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Unplugging the callose plug from sieve pores

Journal article

Open access

Peer reviewed

Unplugging the callose plug from sieve pores

Bo Xie and Zonglie Hong

Plant signaling & behavior, Vol.6(4), pp.491-493

04/2011

DOI: https://doi.org/10.4161/psb.6.4.14653

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https://hdl.handle.net/2376/106599

PMCID: PMC3142375

PMID: 21386663

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Abstract

Plasmodesmata - metabolism

Phloem - ultrastructure

Plants - metabolism

Phloem - metabolism

Gene Expression Regulation, Plant

Arabidopsis - ultrastructure

Glucans - metabolism

Plants - ultrastructure

Arabidopsis - metabolism

Plasmodesmata - ultrastructure

The presence of callose in sieve plates has been known for a long time, but how this polysaccharide plug is synthesized has remained unsolved. Two independent laboratories have recently reported the identification of callose synthase 7 (CalS7), also known as glucan synthase-like 7 (GSL7), as the enzyme responsible for callose deposition in sieve plates. Mutant plants defective in this enzyme failed to synthesize callose in developing sieve plates during phloem formation and were unable to accumulate callose in sieve pores in response to stress treatments. The mutant plants developed less open pores per sieve plate and the pores were smaller in diameter. As a result, phloem conductivity was reduced significantly and the mutant plants were shorter and set fewer seeds.

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Title: Unplugging the callose plug from sieve pores
Creators: Bo Xie - Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID, USA
Zonglie Hong
Publication Details: Plant signaling & behavior, Vol.6(4), pp.491-493
Academic Unit: Center for Reproductive Biology
Publisher: United States
Identifiers: 99900546540301842
Language: English
Resource Type: Journal article