News from Old Compounds: The Mode of Action of Auxin Herbicides

Großmann, Klaus

doi:10.1002/3527602038.ch11

Cited by 8 publications

(21 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results for the effect of dicamba/MCPA in the increase of the proportion of covered grains in naked oat confirm those of Marshall et al (1992). Dicamba and MCPA are both hormonal herbicides (Grossmann 2003) and modify the pattern of division, expansion and differentiation of cells in leaf primordia and expanding leaves (Cartwright 1976). At the cellular level, they stimulate nucleic acid synthesis (DNA and RNA) and protein synthesis (Gauvrit 1996).…”

Section: Discussionsupporting

confidence: 74%

Naked oat response to soil type and herbicides applied at two growing stages

Lanoie¹,

Vanasse²,

Collin³

et al. 2010

Can. J. Plant Sci.

View full text Add to dashboard Cite

. 2010. Naked oat response to soil type and herbicides applied at two growing stages. Can. J. Plant Sci. 90: 247Á255. Naked oat (Avena sativa L.) harvested in the province of Quebec, Canada, develops on average 10% covered grains and sometimes more. The objective of this study was to determine the effect of soil type, herbicides and their application stages on the proportion of covered grains in naked oat genotypes. Three genotypes were evaluated over 2 yr at two experimental sites. At each site, trials were seeded on two different soil types and each entry was treated with one of three types of herbicides: bromoxynil/MCPA, dicamba/MCPA and thifensulfuron methyl/tribenuron methyl, and compared with a weed-free check. The herbicides were applied at Zadoks 12-13 and 22-23. Results showed that dicamba/MCPA herbicide, applied at Zadoks 12-13, increased covered grains compared with the weed-free check and more covered grains were produced with the application made at Zadoks 22-23. However, differences in genotype reactions were observed. Few differences were found among the other weed control treatments. The application of dicamba/MCPA at Zadoks 22-23 decreased yield and test weight, but increased kernel weight. The other weed control treatments had no effect on agronomic characteristics.

show abstract

Section: Discussionsupporting

confidence: 74%

Naked oat response to soil type and herbicides applied at two growing stages

Lanoie¹,

Vanasse²,

Collin³

et al. 2010

Can. J. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…In the present review, the plant‐specific actions of conventional herbicides will be discussed on the basis of up‐to‐date information to design novel herbicides, except for plant hormones and their mimics (9), although they are undoubtedly plant‐specific. Please refer to the recent papers of Hausen & Grossmann (2000) and Grossmann (2003).…”

Section: Introductionmentioning

confidence: 99%

Phytotoxic sites of action for molecular design of modern herbicides (Part 1): The photosynthetic electron transport system

Wakabayashi

Böger

2004

Weed Biology and Management

View full text Add to dashboard Cite

A bird's eye review was tried to select the bio-rational targets from known and novel plant-specific ones for the molecular design of modern herbicides, which exhibit efficient phytotoxicity at a low-use rate and preserve a good environment in the 21st century. In phytotoxic sites in the photosynthetic electron transport (PET) system discussed in the present article (Part 1), the generally called bleaching herbicides interfering with the biosynthesis of photosynthetic pigments, chlorophylls and carotenoids, and the biosynthesis of plastoquinone, were considered to be good models for the molecular design of modern herbicides. The PET itself was still considered as an interesting target site for new herbicides, although they need to exert their action in all green leaves of weeds to achieve herbicidal efficacy. Because these herbicides never form a tight binding with D1-protein, their use-rate cannot be expected to be as low as the herbicides inhibiting chlorophyll or branched amino-acid biosynthesis. Other herbicidal targets found in chloroplasts, namely ATP and NADPH formations, have already been omitted from the worldwide biorational molecular design program of herbicides targeting the PET system.Keywords: bleaching herbicides, modern herbicides, molecular design, photosynthetic electron transport, photosynthetic pigments and plastoquinone, plant-specific targets.kinds of new ALS-inhibiting herbicides that include the triazolinones, triazolopyrimidines and pyrimidyloxybenzoates, and more than 20 newer cyclic imide herbicides of Protox inhibitors in the decade of 1990. The recent phenoxypropionate acetyl-CoA carboxylase (ACCase) inhibitors are applied in the range of 100-150 g ha -1 ; the sulfonylurea and cyclic imide herbicides require an even lower amount, down to 5 g ha -1 , for some commercially active ones. Soil overloading with chemicals or leaching problems, resulting in a massive chemical impact or contamination of ground water, might not be an issue with such lower application doses.In the meantime, the expert genetic engineers have already produced many transgenic herbicide-resistant crops, taking a ca. 75% share in all genetically modified (GM) crops. In such situations, if skillful (agro)chemists design and synthesize only strong phytotoxic herbicidal compounds, they can ask their genetic engineers for selectivity (between crops and weeds) of their candidates, although the chemists should of course pay strong

show abstract

“…However, the magnitude of the increase depended on the genotype. Dicamba/MCPA is a hormonal type of herbicide because its mode of action mimics the plant hormones, auxins, especially indol-3-acetic acid (IAA) (Grossmann, 2003). The genotypes with lower percentage of covered grains (VAO-2 and MF2010-17) showed no or a small increase after the application of dicamba/MCPA.…”

Section: Discussionmentioning

confidence: 99%

“…It is a period with rapid cell division. Dicamba/MCPA is a hormonal type of herbicide because its mode of action mimics the plant hormones, auxins, especially indol-3-acetic acid (IAA) (Grossmann, 2003). When auxinic herbicides are in the plant, they concentrate in the meristematic areas where they infl uence growth, like the natural auxin (IAA) (Roberts and Hutson, 1998).…”

Section: Discussionmentioning

confidence: 99%

Covered Grains in Naked Oat: Environment and Herbicide Effects

et al. 2010

View full text Add to dashboard Cite

Naked oat (Avena sativa L.) grown in Québec, Canada, produces an average of 10% covered grains. The objectives of this study were to evaluate the effects of environment, herbicide, and genotype on the proportion of covered grains, to study the relation between the presence of awns and the proportion of covered grains, and to determine the location of covered grains on the plant (tiller) and on the panicle. Eight oat lines were evaluated over 2 yr at four experimental sites. Each line was treated with bromoxynil/MCPA, dicamba/MCPA, or thifensulfuron methyl/tribenuron methyl applied at Zadoks 12–13 and compared to a hand‐weeded check. The highest percentages of covered grains, 5.5 and 6.9%, were found at different sites in 2006 and 2007. The application of dicamba/MCPA increased the percentage of covered grains in the lines normally producing a higher proportion of covered grains, but low producing lines were less affected. Minor differences were found among the other weed control treatments. No relation was found between the presence of awns and the proportion of naked grains. Covered grains were mostly produced on the main stem and their position on the panicle depended on genotype and weed control treatment.

show abstract

News from Old Compounds: The Mode of Action of Auxin Herbicides

Cited by 8 publications

References 31 publications

Naked oat response to soil type and herbicides applied at two growing stages

Naked oat response to soil type and herbicides applied at two growing stages

Phytotoxic sites of action for molecular design of modern herbicides (Part 1): The photosynthetic electron transport system

Covered Grains in Naked Oat: Environment and Herbicide Effects

Contact Info

Product

Resources

About