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Title: Expansin gene loss is a common occurrence during adaptation to an aquatic environment

Abstract

Expansins comprise a superfamily of plant cell wall loosening proteins that can be divided into four individual families (EXPA, EXPB, EXLA and EXLB). Aside from inferred roles in a variety of plant growth and developmental traits, little is known regarding the function of specific expansin clades, for which there are at least 16 in flowering plants (angiosperms); yet, there is evidence to suggest that some expansins have cell-specific functions, in root hair and pollen tube development, for example. Recently, two duckweed genomes have been sequenced (Spirodela polyrhiza strains 7498 and 9509), revealing significantly reduced superfamily sizes. We hypothesized that there would be a correlation between expansin loss and morphological reductions seen among highly adapted aquatic species. In order to provide an answer to this question, we characterized the expansin superfamilies of the greater duckweed Spirodela, the marine eelgrass Zostera marina and the bladderwort Utricularia gibba. We discovered rampant expansin gene and clade loss among the three, including a complete absence of the EXLB family and EXPA-VII. The most convincing correlation between morphological reduction and expansin loss was seen for Utricularia and Spirodela, which both lack root hairs and the root hair expansin clade EXPA-X. Contrary to the pattern observed inmore » other species, four Utricularia expansins failed to branch within any clade, suggesting that they may be the result of neofunctionalization. Furthermore, an expansin clade previously discovered only in eudicots was identified in Spirodela, allowing us to conclude that the last common ancestor of monocots and eudicots contained a minimum of 17 expansins.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Lebanon Valley College, Annville, PA (United States)
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1598353
Alternate Identifier(s):
OSTI ID: 1575941
Grant/Contract Number:  
FG02-84ER13179; DGE-1255832
Resource Type:
Accepted Manuscript
Journal Name:
The Plant Journal
Additional Journal Information:
Journal Volume: 101; Journal Issue: 3; Journal ID: ISSN 0960-7412
Publisher:
Society for Experimental Biology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; pirodela polyrhiza (duckweed); Utricularia gibba (bladderwort); Zostera mariana (eelgrass); expansin; gene loss

Citation Formats

Hepler, Nathan K., Bowman, Alexa, Carey, Robert E., and Cosgrove, Daniel J. Expansin gene loss is a common occurrence during adaptation to an aquatic environment. United States: N. p., 2019. Web. doi:10.1111/tpj.14572.
Hepler, Nathan K., Bowman, Alexa, Carey, Robert E., & Cosgrove, Daniel J. Expansin gene loss is a common occurrence during adaptation to an aquatic environment. United States. https://doi.org/10.1111/tpj.14572
Hepler, Nathan K., Bowman, Alexa, Carey, Robert E., and Cosgrove, Daniel J. Fri . "Expansin gene loss is a common occurrence during adaptation to an aquatic environment". United States. https://doi.org/10.1111/tpj.14572. https://www.osti.gov/servlets/purl/1598353.
@article{osti_1598353,
title = {Expansin gene loss is a common occurrence during adaptation to an aquatic environment},
author = {Hepler, Nathan K. and Bowman, Alexa and Carey, Robert E. and Cosgrove, Daniel J.},
abstractNote = {Expansins comprise a superfamily of plant cell wall loosening proteins that can be divided into four individual families (EXPA, EXPB, EXLA and EXLB). Aside from inferred roles in a variety of plant growth and developmental traits, little is known regarding the function of specific expansin clades, for which there are at least 16 in flowering plants (angiosperms); yet, there is evidence to suggest that some expansins have cell-specific functions, in root hair and pollen tube development, for example. Recently, two duckweed genomes have been sequenced (Spirodela polyrhiza strains 7498 and 9509), revealing significantly reduced superfamily sizes. We hypothesized that there would be a correlation between expansin loss and morphological reductions seen among highly adapted aquatic species. In order to provide an answer to this question, we characterized the expansin superfamilies of the greater duckweed Spirodela, the marine eelgrass Zostera marina and the bladderwort Utricularia gibba. We discovered rampant expansin gene and clade loss among the three, including a complete absence of the EXLB family and EXPA-VII. The most convincing correlation between morphological reduction and expansin loss was seen for Utricularia and Spirodela, which both lack root hairs and the root hair expansin clade EXPA-X. Contrary to the pattern observed in other species, four Utricularia expansins failed to branch within any clade, suggesting that they may be the result of neofunctionalization. Furthermore, an expansin clade previously discovered only in eudicots was identified in Spirodela, allowing us to conclude that the last common ancestor of monocots and eudicots contained a minimum of 17 expansins.},
doi = {10.1111/tpj.14572},
journal = {The Plant Journal},
number = 3,
volume = 101,
place = {United States},
year = {Fri Oct 18 00:00:00 EDT 2019},
month = {Fri Oct 18 00:00:00 EDT 2019}
}

Journal Article:
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Cited by: 9 works
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Figures / Tables:

Table 1 Table 1: Expansin gene families in select land plants.

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