A Technique for Studying Root vs. Shoot Uptake of Soil‐Applied Herbicides*

Eshel, Y.; Prendeville, G. N.

doi:10.1111/j.1365-3180.1967.tb01376.x

Cited by 32 publications

(19 citation statements)

References 5 publications

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“…A absorção de herbicidas aplicados em pré-emergência é influenciada principalmente por barreiras anatômico-fisiológicas à passagem dos herbicidas e por características físico-químicas destes. Em algumas espécies, os herbicidas que chegam ao solo são absorvidos preferencialmente pelo sistema radicular das plantas, enquanto em outras eles são absorvidos sobretudo pelas partes aéreas emergentes, como o hipocótilo, epicótilo e coleóptilo (Eshel & Predeville, 1967).…”

Section: Introductionunclassified

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

et al. 2009

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Palavras-chave: resistência de plantas daninhas, amendoim-bravo, fomesafen.ABSTRACT -Three trials were carried out to verify if the site of formesafen, absorption leaves or soil, affects the efficacy of controling this herbicide in wild poinsettia biotypes resistant and susceptible to the product; and to determine which plant structures are more important for fomesafen absorption. In the first two trials, fomesafen dose-response was evaluated on biotypes susceptible and resistant to PROTOX inhibitors, in the pre (first trial) and post emergence (second trial) applications. In a third trial, different deposition sites of fomesafen were evaluated using the double pot system to verify the structures of wild poinsettia plants which were most important to fomesafen absorption. Overall, the results indicated that shoot absorption of fomesafen was more limited on wild poinsettia biotypes with PROTOX resistance than on susceptible ones and that these differences between biotypes were less important when applied in pre-emergence. When applied to soil, fomesafen efficacy increased when the herbicide was placed near wild poinsettia shoots than close to their roots. These results support the hypothesis that leaf differences between resistant and susceptible plants may limit fomesafen absorption on biotypes resistant to PROTOX inhibitors.

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Section: Introductionunclassified

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

et al. 2009

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“…When the shoot was exposed to a concentration of 6 ppm, no effects were observed. It seems that although there are differences among photosynthetic inhibitors concerning their phytotoxicity, their common feature is that they all enter the plants through the roots (Eshel, 1969b) and cause injury to plants only when present at the root zone. Pre-emergence herbicides are usually affected by rainfall or irrigation.…”

Section: Resultsmentioning

confidence: 99%

“…The site of entry of the two herbicides was studied by employing a method similar to the double pot technique (Eshel & Prendeville, 1967). Because of difficulties in planting sugar beet seedlings in a double pot, one pot was used, in which a separation between the root and shoot zones was achieved by activated charcoal.…”

Section: Site Of Uptakementioning

confidence: 99%

Selectivity of Pyrazon and Benzthiazuron in Sugar Beet

Eshel

Sompolinsky

1970

Weed Research

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Summary. Pyrazon (5‐amino‐4‐chloro‐2‐phenylpyridazin‐3(2H)‐one) and benzthiazuron (N‐(2‐benzothiazolyl)‐N′‐methylurea) were compared in respect to their effects on photosynthesis and growth of sugar beet, and to their movement in soil. Benzthiazuron had a five‐fold greater inhibitory effect than pyrazon on photosynthesis, and a ten‐fold greater inhibitory effect on the growth of sugar beet grown in treated culture solution. On the other hand, sugar beet was more tolerant to benzthiazuron than to pyrazon when grown in soil treated pre‐emergence with the herbicides. Leaching of pyrazon in clay soil appeared to be greater than that of benzthiazuron. Both herbicides entered the emerging seedlings through their roots, and hence movement of the compounds to the root zone by excess irrigation might be injurious to sugar beet. This was found to be more likely to occur with pyrazon than with benzthiazuron. Sélectivité du PCA et du benzthiazuron pour la betterave sucrière Résumé. Le PCA (5‐amino‐4‐chloro‐2‐phénylpyridazine‐3(2H)‐one) et le benz‐thiazuron (N‐(2‐benzothiazolyl)‐N′‐méthylurée) ont été compareés en ce qui concerne leurs effets sur la Photosynthèse et la croissance de la betterave sucrière et leur migration dans le sol. Le benzthiazuron manifesta un effet inhibiteur cinq fois plus grand sur la croissance de la betterave sucrière cultivée en solution traitée. En revanche, la betterave sucrière fut plus résistante au benzthiazuron qu'au PCA quand elle fut cultivée dans un sol traité en pré‐levée avec ces herbicides. Le lessivage du PCA dans un sol argileux apparut plus important que celui du benzthiazuron. II a été constaté que les deux herbicides pénétraient dans les plantules, après la Ievée, par les racines et que la migration des produits dans la zone des racines sous I'effet d'une irrigation excessive pouvait provoquer des dégâts sur la betterave à sucre. II fut constaté que ce phénomène était plus probable avec le PCA qu'avec le benthiazuron. Selektivität von Pyrazon und Benzthiazuron in Zuckerrüben Zusammenfassung. Pyrazon (5‐Amino‐4‐chlor‐2‐Phenylpyridazin‐3(2H)‐one) und Benzthiazuron (N‐(2‐Benzothiazolyl)‐N′‐methyl‐harnstoff) wurden in ihrer Wirkung auf die Photosynthese und das Wachstum von Zuckerrüben sowie auf ihre Beweglichkeit im Boden verglichen. Das Herbizid Benzthiazuron hatte einen fünffach grösseren Hemmeffekt auf das Wachstum von Zuckerrüben, die in einer behandelten Nährlösung wuchsen. Andererseits waren Zuckerrüben toleranter gegenüber Benzthiazuron als gegenüber Pyrazon, wenn sie in Boden wuchsen, der im Vorauflauf mit diesen Herbiziden behandelt worden war. Die Einwaschung von Pyrazon in Tonboden war offensichtlich grösser als diejenige von Benzthiazuron. Es konnte festgestellt werden, dass beide Herbizide in die auflaufenden Keimpflanzen durch deren Wurzel eindrangen. Daher könnte die Verlagerung der Herbizide in die Wurzelzone durch Überschussbewässerung die Zuckerrüben schädigen. Dies ist bei Pyrazon offensichtlich eher zu erwarten als bei Benzthiazuron.

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“…By inhibiting lateral roots in one zone, the possibility of compensatory root growth occurring in other zones with subsequent effects on uptake of *'Ca and ^^P, was investigated by diflerential placement of trifluralin and/or nutrients in the various zones. The combination did not include trifluralin in the shoot zone preemergence as in previous studies it severely inhibited aerial plant growth (Prendeville et al, 1967;O'Donovan & Prendeville, 1976).…”

Section: Methodsmentioning

confidence: 99%

“…In other experiments six germinated seedlings (72 h) of each species with uniform shoot length were planted in untreated, nutrient-treated or trifluralin-treated soil in double plastic pots (Eshel & Prendeville, 1967). This technique separated the root system in the lower pot from the shoot zone in the upper pot.…”

Section: Methodsmentioning

confidence: 99%

Uptake patterns of soil‐applied ⁴⁵Ca and ³²P in some legume species as influenced by differential trifluralin placement

O’Donovan

Prendeville

1977

Weed Research

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Summary: The effect of localized placement of trifluralin on uptake patterns of soil‐applied 45Ca in vetch (Vicia sativa L.), pea (Pisum sativum L.) and soybean (Glycine max) and 32P in vetch and pea was investigated in two soil zones in the roots and in the shoot zone before and after plant emergence. When trifluralin was in the upper root zone severe inhibition of lateral roots occurred as well as a marked decrease in uptake of 45Ca and 32P from this zone. Root growth in the lower zone was unaffected, but uptake of 45Ca and 32P was slightly reduced. Compensatory adventitious root growth as well as a marked increase in uptake of 45Ca and 32P occurred in the shoot zone. Neither root growth nor uptake of 45Ca or 32P in the upper root zone were affected by the presence of trifluralin in the lower root region. When trifluralin was placed in the shoot zone after plant emergence, adven‐titious roots on the shoots were inhibited and uptake of 45Ca and 32P was reduced.

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A Technique for Studying Root vs. Shoot Uptake of Soil‐Applied Herbicides*

Cited by 32 publications

References 5 publications

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

Selectivity of Pyrazon and Benzthiazuron in Sugar Beet

Uptake patterns of soil‐applied ⁴⁵Ca and ³²P in some legume species as influenced by differential trifluralin placement

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A Technique for Studying Root vs. Shoot Uptake of Soil‐Applied Herbicides*

Cited by 32 publications

References 5 publications

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

Local de absorção de fomesafen como mecanismo de resistência em biótipo de Euphorbia heterophylla resistente aos inibidores da PROTOX

Selectivity of Pyrazon and Benzthiazuron in Sugar Beet

Uptake patterns of soil‐applied 45Ca and 32P in some legume species as influenced by differential trifluralin placement

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Uptake patterns of soil‐applied ⁴⁵Ca and ³²P in some legume species as influenced by differential trifluralin placement