scholarly journals Gene flow from GM glyphosate-tolerant to conventional soybeans under field conditions in Japan

2006 ◽  
Vol 5 (3) ◽  
pp. 169-173 ◽  
Author(s):  
Yasuyuki Yoshimura ◽  
Kazuhito Matsuo ◽  
Koji Yasuda
Keyword(s):  
Gene Flow ◽  
Field Conditions

scholarly journals Gene flow from Clearfield® rice to weedy rice under field conditions

2016 ◽  
Vol 62 (No. 1) ◽  
pp. 16-22 ◽  
Author(s):  
Engku AK ◽  
M. Norida ◽  
Juraimi AS ◽  
Rafii MY ◽  
Abdullah SNA ◽  
...  
Keyword(s):  
Gene Flow ◽  
Field Conditions ◽  
Weedy Rice

Gene Flow between Potato Cultivars under Experimental Field Conditions in Argentina

2014 ◽  
Vol 57 (2) ◽  
pp. 111-122 ◽  
Author(s):  
M. A. Capurro ◽  
E. L. Camadro ◽  
R. W. Masuelli
Keyword(s):  
Gene Flow ◽  
Potato Cultivars ◽  
Field Conditions ◽  
Experimental Field

scholarly journals Pollen-mediated Gene Flow from Coreopsis tinctoria to Coreopsis leavenworthii: Inheritance of Morphological Markers and Determination of Gene Flow Rates as Affected by Separation Distances

2012 ◽  
Vol 137 (3) ◽  
pp. 173-179 ◽  
Author(s):  
Sarah M. Smith ◽  
Zhanao Deng
Keyword(s):  
Gene Flow ◽  
Field Conditions ◽  
Genetic Integrity ◽  
Morphological Marker ◽  
Flow Rates ◽  
Central Florida ◽  
Coreopsis Tinctoria ◽  
Hand Pollination ◽  
Strong Concern

The genus Coreospsis is Florida’s state wildflower. One species, Coreopsis leavenworthii, is nearly endemic to Florida and is highly desirable for use in highway beautification. Maintaining genetic integrity is critical for C. leavenworthii producers, growers, and users. Coreopsis tinctoria is closely related to and shares similar habitats with C. leavenworthii in Florida. Previous studies indicated that the two species could hybridize and the F1 hybrids showed chromosomal aberrations and reduced pollen stainability. There has been strong concern that pollen-mediated gene flow from C. tinctoria could contaminate the gene pool and compromise the genetic integrity of C. leavenworthii. In the current study, hand pollination showed that C. leavenworthii and C. tinctoria were highly compatible. F1 hybrids were fertile and readily produced F2 and BC1 individuals. Inheritance studies indicated that the maroon spot on the ray flower is controlled by a single dominant allele and is homozygous in C. tinctoria. This spot serves as a reliable, easy-to-score morphological marker to detect pollen-mediated gene flow from C. tinctoria to C. leavenworthii. Following a discontinuous design, gene flow studies were conducted under field conditions in central Florida over 2 years. The highest rate of pollen-mediated gene flow from C. tinctoria to C. leavenworthii was 4.2% and occurred when the two species were grown 1.5 m apart. Gene flow from C. tinctoria to C. leavenworthii under field conditions followed a leptokurtic curve. Based on the obtained regression equation, separating the two species by 60 m or more could lower the pollen-mediated gene flow from C. tinctoria to minimal levels and protect the genetic integrity of C. leavenworthii.

Pollen-mediated gene flow between glyphosate-resistant Brassica napus canola and B. juncea and B. carinata mustard crops under large-scale field conditions in Saskatchewan

2013 ◽  
Vol 93 (6) ◽  
pp. 1083-1087 ◽  
Author(s):  
Ginette Séguin-Swartz ◽  
Hugh J. Beckie ◽  
Suzanne I. Warwick ◽  
Vicky Roslinsky ◽  
Jacqueline A. Nettleton ◽  
...  
Keyword(s):  
Gene Flow ◽  
Brassica Napus ◽  
Brassica Juncea ◽  
Large Scale ◽  
Glyphosate Resistance ◽  
Field Conditions ◽  
Hybrid Plants ◽  
Scale Field ◽  
Large Scale Field ◽  
Species Specific

Séguin-Swartz, G., Beckie, H. J., Warwick, S. I., Roslinsky, V., Nettleton, J. A., Johnson, E. N. and Falk, K. C. 2013. Pollen-mediated gene flow between glyphosate-resistant Brassica napus canola and B. juncea and B. carinata mustard crops under large-scale field conditions in Saskatchewan. Can. J. Plant Sci. 93: 1083–1087. A Saskatchewan study examined hybridization between two mustard (Brassica juncea and B. carinata) crops that were either adjacent to a glyphosate-resistant canola (B. napus) crop or separated by a 5-m strip. Overall, field hybridization levels, detected with glyphosate resistance and species-specific AFLP markers, were low: 0.024% and up to 400 m in the adjacent B. juncea field and 0.013% (up to 350 m) in the separated field, and 0.005% (up to 150 m) in the adjacent B. carinata field and 0.002% (up to 65 m) in the separated field. Based on fitness information under controlled conditions, the fertility of hybrid plants is expected to be low.

Assessment of gene flow in white clover (Trifolium repens L.) under field conditions in Australia using phenotypic and genetic markers

2012 ◽  
Vol 63 (2) ◽  
pp. 155 ◽  
Author(s):  
J. A. De Lucas ◽  
J. W. Forster ◽  
K. F. Smith ◽  
G. C. Spangenberg
Keyword(s):  
Gene Flow ◽  
White Clover ◽  
Simple Sequence Repeat ◽  
Physical Distance ◽  
Field Conditions ◽  
Phenotypic Trait ◽  
Sequence Repeat ◽  
Pasture Legumes ◽  
Visual Markers ◽  
Simple Sequence

White clover is one of the most important pasture legumes in global temperate regions. It is an outcrossing, insect-pollinated species with gene flow occurring naturally between plants. A 2-year study was conducted to assess the relationship between gene flow and physical distance in white clover under field conditions in southern Australia. White clover plants exhibiting a red leaf mark phenotypic trait acted as pollen donors to recipient plants lacking leaf markings at distances up to 200 m distant from the donor plants. Progeny were scored for the dominant red-leafed phenotype and gene flow was modelled. Paternity was confirmed using simple sequence repeat markers. A leptokurtic pattern of gene flow was observed under conditions designed to measure maximised gene flow with the majority of pollination occurring in the first 50 m from the donor pollen source. The combined use of simple sequence repeat and visual markers confirmed that there was also a white clover pollen source in addition to the donor plants. This research confirms the difficulty in ensuring absolute containment of gene flow in an outcrossing species grown in an environment when endemic populations are known to exist.

scholarly journals Dynamics of Glyphosate Resistance in Lolium perenne: Pollen-Mediated Gene Flow under Field Conditions in Argentina

Agronomy ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 286
Author(s):  
Marcos Yanniccari ◽  
Carolina Istilart ◽  
Daniel Giménez ◽  
Ana Castro
Keyword(s):  
Gene Flow ◽  
Fold Increase ◽  
Glyphosate Resistance ◽  
Negative Control ◽  
Field Conditions ◽  
High Tendency ◽  
Pollen Dispersion ◽  
Trap Plants ◽  
Resistance To Herbicides ◽  
High Level

The genus Lolium has shown a high tendency to evolve resistance to herbicides. Considering the high level of allogamy of L. perenne and the importance of the wind as an agent for pollen dispersion, the aim of this work was to assess and quantify the effective glyphosate-resistant gene flow by pollen in L. perenne under field conditions. Pollen-mediated gene flow from glyphosate-resistant to -susceptible plants was studied using a donor–receptor design. The results indicate that the effective gene flow reached trap plants distanced ≤35 m downwind from the source of pollen. The progeny of receptor plants growing 0 m from the pollen donors showed 13% of individuals with low glyphosate sensitivity. This represents a seven-fold increase in the frequency of glyphosate-resistant individuals found in the progeny of plants isolated during the flowering period (negative control). Similarly, the progenies of plants grown at 15 and 25 m from the source of glyphosate resistance showed an increase in the frequency of resistant plants by about four- and two-fold, respectively. When the receptor plants were located at >35 m, no glyphosate-resistant plants were detected in their progenies. Management should aim for prevention or delay of flowering of glyphosate-resistant plants.

scholarly journals Gene flow from cultivated rice to the wild species Oryza rufipogon under experimental field conditions

2003 ◽  
Vol 157 (3) ◽  
pp. 657-665 ◽  
Author(s):  
Zhi Ping Song ◽  
Bao-Rong Lu ◽  
Ying Guo Zhu ◽  
Jia Kuan Chen
Keyword(s):  
Gene Flow ◽  
Wild Species ◽  
Oryza Rufipogon ◽  
Field Conditions ◽  
Cultivated Rice ◽  
Experimental Field
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