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Callose (beta-1,3 glucan) is essential for Arabidopsis pollen wall patterning, but not tube growth.

Abstract：

BACKGROUND:Callose (beta-1,3 glucan) separates developing pollen grains, preventing their underlying walls (exine) from fusing. The pollen tubes that transport sperm to female gametes also contain callose, both in their walls as well as in the plugs that segment growing tubes. Mutations in CalS5, one of several Arabidopsis beta-1,3 glucan synthases, were previously shown to disrupt callose formation around developing microspores, causing aberrations in exine patterning, degeneration of developing microspores, and pollen sterility. RESULTS:Here, we describe three additional cals5 alleles that similarly alter exine patterns, but instead produce fertile pollen. Moreover, one of these alleles (cals5-3) resulted in the formation of pollen tubes that lacked callose walls and plugs. In self-pollinated plants, these tubes led to successful fertilization, but they were at a slight disadvantage when competing with wild type. CONCLUSION:Contrary to a previous report, these results demonstrate that a structured exine layer is not required for pollen development, viability or fertility. In addition, despite the presence of callose-enriched walls and callose plugs in pollen tubes, the results presented here indicate that callose is not required for pollen tube functions.

journal_name

BMC Plant Biol

journal_title

BMC plant biology

authors

Nishikawa S,Zinkl GM,Swanson RJ,Maruyama D,Preuss D

doi

10.1186/1471-2229-5-22

keywords:

subject

Has Abstract

pub_date

2005-10-07 00:00:00

pages

22

issn

1471-2229

pii

1471-2229-5-22

journal_volume

5

pub_type

杂志文章

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