Abstract
Glyphosate [N-(phosphonomethyl)glycine] herbicide can be topically applied twice at rates as high as 0.84 kg a.e. (acid-equivalent) ha−1 to glyphosate-resistant cotton (Gossypium hirsutum L.) cultivars until the fourth true leaf stage, with the requirement of at least 10 d and two nodes of growth between applications. But, such cultivars are not reproductively resistant to glyphosate applied topically or imprecisely directed after the four-leaf stage because glyphosate can curtail pollen development and ovule fertilization, which potentially reduces yield. Extending glyphosate resistance past the four-leaf stage would provide growers with additional weed management options. Our objective was to test under field conditions glyphosate resistance of cotton germplasm transformed with gene constructs previously shown to impart extended glyphosate resistance in the greenhouse. Four or six transgenic cotton lines containing one of several constructs conferring extended glyphosate resistance, plus the current glyphosate-resistant control (‘Coker 312’-1445), were tested at nine U.S. locations in 2001. Within locations, treatment designs consisted of cross-classified arrangements of transgenic lines and glyphosate rates [0, 1.68, and 2.52 kg a.e. ha−1]. Treated plots received glyphosate over-the-top of cotton at four growth stages (3-, 6-, 10-, and 14-leaf crop stages). Compared with Coker 312-1445, extended glyphosate resistance was expressed as higher yields when glyphosate was applied topically at the four growth stages. Mature plant mapping confirmed extended glyphosate resistance of the new transgenic cotton through similar fruit distribution and weight with or without glyphosate treatment. The capability to apply glyphosate topically to cotton later in crop development will facilitate weed management and could reduce dependence on directed herbicides.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Glyphosate after the four-leaf stage can curtail cotton pollen development and ovule fertilization.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- glyphosatee0
- Outcome
- pollen development and ovule fertilizatione0
- Direction
- curtaile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glyphosate can curtail pollen development and ovule fertilization”
t0“Cotton”
Claim · model-written summary
Transgenic cotton lines had higher yield than Coker 312-1445 under topical glyphosate across four growth stages.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate was applied topically at the four growth stagese0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- Coker 312-1445e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with Coker 312-1445, extended glyphosate resistance was expressed as higher yields when glyphosate was applied topically at the four growth stages”
t0“Cotton”
Claim · model-written summary
New transgenic cotton had similar fruit distribution with and without glyphosate.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate treatmente0
- Outcome
- fruit distributione0
- Direction
- similare0
- Comparator
- without glyphosate treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mature plant mapping confirmed extended glyphosate resistance of the new transgenic cotton through similar fruit distribution and weight with or without glyphosate treatment”
t0“Cotton”
Claim · model-written summary
New transgenic cotton had similar fruit weight with and without glyphosate.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate treatmente0
- Outcome
- weighte0
- Direction
- similare0
- Comparator
- without glyphosate treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mature plant mapping confirmed extended glyphosate resistance of the new transgenic cotton through similar fruit distribution and weight with or without glyphosate treatment”
t0“Cotton”
Claim · model-written summary
The authors conclude later topical glyphosate application could facilitate weed management and reduce directed herbicide dependence.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- facilitate weed management and could reduce dependence on directed herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The capability to apply glyphosate topically to cotton later in crop development will facilitate weed management and could reduce dependence on directed herbicides”
The same questions in other papers
glyphosate · growth · Gossypium hirsutum (cotton)Results differ
8 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.