Sub-lethal glyphosate exposure alters flowering phenology and causes transient male-sterility in Brassica spp

Jason P. Londo, John McKinney, Matthew Schwartz, Mike Bollman, Cynthia Sagers, Lidia Watrud

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Background: Herbicide resistance in weedy plant populations can develop through different mechanisms such as gene flow of herbicide resistance transgenes from crop species into compatible weedy species or by natural evolution of herbicide resistance or tolerance following selection pressure. Results from our previous studies suggest that sub-lethal levels of the herbicide glyphosate can alter the pattern of gene flow between glyphosate resistant Canola®, Brassica napus, and glyphosate sensitive varieties of B. napus and B. rapa. The objectives of this study were to examine the phenological and developmental changes that occur in Brassica crop and weed species following sub-lethal doses of the herbicides glyphosate and glufosinate. We examined several vegetative and reproductive traits of potted plants under greenhouse conditions, treated with sub-lethal herbicide sprays. Results: Our results indicate that exposure of Brassica spp. to a sub-lethal dose of glyphosate results in altering flowering phenology and reproductive function. Flowering of all sensitive species was significantly delayed and reproductive function, specifically male fertility, was suppressed. Higher dosage levels typically contributed to an increase in the magnitude of phenotypic changes. Conclusions: These results demonstrate that Brassica spp. plants that are exposed to sub-lethal doses of glyphosate could be subject to very different pollination patterns and an altered pattern of gene flow that would result from changes in the overlap of flowering phenology between species. Implications include the potential for increased glyphosate resistance evolution and spread in weedy communities exposed to sub-lethal glyphosate.

Original languageEnglish (US)
Article number70
JournalBMC Plant Biology
Volume14
Issue number1
DOIs
StatePublished - Mar 21 2014
Externally publishedYes

Fingerprint

male fertility
Brassica
glyphosate
lethal genes
phenology
flowering
herbicide resistance
lethal dose
gene flow
herbicides
Brassica napus
cole crops
glufosinate
container-grown plants
Brassica rapa
reproductive traits
canola
transgenes
pollination
weeds

Keywords

  • Brassica
  • Canola®
  • Glufosinate
  • Glyphosate
  • Herbicide drift
  • Transgene escape

ASJC Scopus subject areas

  • Plant Science

Cite this

Sub-lethal glyphosate exposure alters flowering phenology and causes transient male-sterility in Brassica spp. / Londo, Jason P.; McKinney, John; Schwartz, Matthew; Bollman, Mike; Sagers, Cynthia; Watrud, Lidia.

In: BMC Plant Biology, Vol. 14, No. 1, 70, 21.03.2014.

Research output: Contribution to journalArticle

Londo, Jason P. ; McKinney, John ; Schwartz, Matthew ; Bollman, Mike ; Sagers, Cynthia ; Watrud, Lidia. / Sub-lethal glyphosate exposure alters flowering phenology and causes transient male-sterility in Brassica spp. In: BMC Plant Biology. 2014 ; Vol. 14, No. 1.
@article{bddfa0a9b26941648b4d2dd6b0b5ed95,
title = "Sub-lethal glyphosate exposure alters flowering phenology and causes transient male-sterility in Brassica spp",
abstract = "Background: Herbicide resistance in weedy plant populations can develop through different mechanisms such as gene flow of herbicide resistance transgenes from crop species into compatible weedy species or by natural evolution of herbicide resistance or tolerance following selection pressure. Results from our previous studies suggest that sub-lethal levels of the herbicide glyphosate can alter the pattern of gene flow between glyphosate resistant Canola{\circledR}, Brassica napus, and glyphosate sensitive varieties of B. napus and B. rapa. The objectives of this study were to examine the phenological and developmental changes that occur in Brassica crop and weed species following sub-lethal doses of the herbicides glyphosate and glufosinate. We examined several vegetative and reproductive traits of potted plants under greenhouse conditions, treated with sub-lethal herbicide sprays. Results: Our results indicate that exposure of Brassica spp. to a sub-lethal dose of glyphosate results in altering flowering phenology and reproductive function. Flowering of all sensitive species was significantly delayed and reproductive function, specifically male fertility, was suppressed. Higher dosage levels typically contributed to an increase in the magnitude of phenotypic changes. Conclusions: These results demonstrate that Brassica spp. plants that are exposed to sub-lethal doses of glyphosate could be subject to very different pollination patterns and an altered pattern of gene flow that would result from changes in the overlap of flowering phenology between species. Implications include the potential for increased glyphosate resistance evolution and spread in weedy communities exposed to sub-lethal glyphosate.",
keywords = "Brassica, Canola{\circledR}, Glufosinate, Glyphosate, Herbicide drift, Transgene escape",
author = "Londo, {Jason P.} and John McKinney and Matthew Schwartz and Mike Bollman and Cynthia Sagers and Lidia Watrud",
year = "2014",
month = "3",
day = "21",
doi = "10.1186/1471-2229-14-70",
language = "English (US)",
volume = "14",
journal = "BMC Plant Biology",
issn = "1471-2229",
publisher = "BioMed Central",
number = "1",

}

TY - JOUR

T1 - Sub-lethal glyphosate exposure alters flowering phenology and causes transient male-sterility in Brassica spp

AU - Londo, Jason P.

AU - McKinney, John

AU - Schwartz, Matthew

AU - Bollman, Mike

AU - Sagers, Cynthia

AU - Watrud, Lidia

PY - 2014/3/21

Y1 - 2014/3/21

N2 - Background: Herbicide resistance in weedy plant populations can develop through different mechanisms such as gene flow of herbicide resistance transgenes from crop species into compatible weedy species or by natural evolution of herbicide resistance or tolerance following selection pressure. Results from our previous studies suggest that sub-lethal levels of the herbicide glyphosate can alter the pattern of gene flow between glyphosate resistant Canola®, Brassica napus, and glyphosate sensitive varieties of B. napus and B. rapa. The objectives of this study were to examine the phenological and developmental changes that occur in Brassica crop and weed species following sub-lethal doses of the herbicides glyphosate and glufosinate. We examined several vegetative and reproductive traits of potted plants under greenhouse conditions, treated with sub-lethal herbicide sprays. Results: Our results indicate that exposure of Brassica spp. to a sub-lethal dose of glyphosate results in altering flowering phenology and reproductive function. Flowering of all sensitive species was significantly delayed and reproductive function, specifically male fertility, was suppressed. Higher dosage levels typically contributed to an increase in the magnitude of phenotypic changes. Conclusions: These results demonstrate that Brassica spp. plants that are exposed to sub-lethal doses of glyphosate could be subject to very different pollination patterns and an altered pattern of gene flow that would result from changes in the overlap of flowering phenology between species. Implications include the potential for increased glyphosate resistance evolution and spread in weedy communities exposed to sub-lethal glyphosate.

AB - Background: Herbicide resistance in weedy plant populations can develop through different mechanisms such as gene flow of herbicide resistance transgenes from crop species into compatible weedy species or by natural evolution of herbicide resistance or tolerance following selection pressure. Results from our previous studies suggest that sub-lethal levels of the herbicide glyphosate can alter the pattern of gene flow between glyphosate resistant Canola®, Brassica napus, and glyphosate sensitive varieties of B. napus and B. rapa. The objectives of this study were to examine the phenological and developmental changes that occur in Brassica crop and weed species following sub-lethal doses of the herbicides glyphosate and glufosinate. We examined several vegetative and reproductive traits of potted plants under greenhouse conditions, treated with sub-lethal herbicide sprays. Results: Our results indicate that exposure of Brassica spp. to a sub-lethal dose of glyphosate results in altering flowering phenology and reproductive function. Flowering of all sensitive species was significantly delayed and reproductive function, specifically male fertility, was suppressed. Higher dosage levels typically contributed to an increase in the magnitude of phenotypic changes. Conclusions: These results demonstrate that Brassica spp. plants that are exposed to sub-lethal doses of glyphosate could be subject to very different pollination patterns and an altered pattern of gene flow that would result from changes in the overlap of flowering phenology between species. Implications include the potential for increased glyphosate resistance evolution and spread in weedy communities exposed to sub-lethal glyphosate.

KW - Brassica

KW - Canola®

KW - Glufosinate

KW - Glyphosate

KW - Herbicide drift

KW - Transgene escape

UR - http://www.scopus.com/inward/record.url?scp=84899141954&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899141954&partnerID=8YFLogxK

U2 - 10.1186/1471-2229-14-70

DO - 10.1186/1471-2229-14-70

M3 - Article

C2 - 24655547

AN - SCOPUS:84899141954

VL - 14

JO - BMC Plant Biology

JF - BMC Plant Biology

SN - 1471-2229

IS - 1

M1 - 70

ER -