Plasmodesmos: transporte simplástico de herbicidas na planta

Concenço, Germani; Ferreira, Evander Alves; Ferreira, Francisco Affonso; Santos, J.B.

doi:10.1590/s0100-83582007000200024

Cited by 6 publications

(3 citation statements)

References 33 publications

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“…Plasmodesmata are channels that connect neighboring cells allowing the exchange of structural and functional molecules at a faster rate than transport through membranes (Concenço et al 2007). Embryogenic cells undergo changes when acquire the competence to form pro-embryos as: cell wall thickening, surrounding tissues senescence, increase of amiloplasts around the nucleus, no spherical nucleus and consequentilly numerous mitotic divisions.…”

Section: Resultsmentioning

confidence: 99%

Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses

Pádua

Paiva

Labory

et al. 2013

An. Acad. Bras. Ciênc.

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Oil palm is one of the most economically valuable oil seed plants, but the expansion of plantations has been limited by availability of seedlings, as the conventional propagation is through seeds, which have low germination rates. One possible solution for the large-scale production is the use of somatic embryogenesis. The aim of this study was evaluate the effects auxins 2,4-D and picloram on the induction of pro-embryogenic masses in E.guineenesis hybrid leaf explants and characterize, regarding embryogenic characteristics, with cytochemical and ultrastructural analisys. Specifically, in vitro plantlets leaves fragments were inoculated in ). After 90 days the presence/ absence of cell masses were evaluated. Both growth regulators efficiently induced cellular masses regardless of the concentrations applied. As the cell masses were not homogeneously formed, they were classified according to color and shape into four types: TYPE 1 -elongated and translucent, TyPE 2 -uneven and translucent, TyPE 3 -globular and beige TyPE 4 -globular and white. Based on the anatomical and ultrastructural features, TyPE 2, 3 and 4 cell masses were considered to have the highest embryogenic potential and therefore may be most suited to large-scale vegetative propagation of oil palm.

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Section: Resultsmentioning

confidence: 99%

Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses

Pádua

Paiva

Labory

et al. 2013

An. Acad. Bras. Ciênc.

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“…A presença de cutícula nas células jovens absorventes de raízes é inexistente ou reduzida, em contraste com os órgãos aéreos das plantas (Vidal, 2002;Rodrigues, 2003;Silva et al, 2007), e talvez seja pequena também a camada cuticular nas partes aéreas presentes no solo das plantas em emergência, o que poderia explicar o menor efeito de fomesafen no biótipo resistente em relação ao suscetível na aplicação em pós-emergência, comparada à aplicação em pré-emergência. Outra possibilidade, que não pode ser descartada, é de que tecidos mais jovens poderiam ter maior capacidade de metabolização de inibidores da PROTOX do que tecidos mais velhos, além de possuir plasmodesmos com maior diâmetro e com translocação mais efetiva de moléculas com tamanho de até 1 kDa, como a da maioria dos herbicidas (Concenço et al, 2007), facilitando sua dispersão por maior quantidade de células.…”

Section: Resultsunclassified

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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“…Even with the metabolism and the anatomorphological characteristics of each seedling, the lipophilic characteristic of the herbicides possibly favored the absorption and penetration into plant tissues. Herbicides with kow close to 100 are easily translocated by the symplast (Silva et al, 2013), which is a slow transportation route (Concenço et al, 2007); this may provide due time to the metabolization of the herbicide by the plant metabolism. With this, the negative effects of herbicides on seedlings were possibly minimized.…”

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confidence: 99%

Sugarcane Seedlings Influenced by the Management with Herbicides

et al. 2018

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-This research aimed at studying herbicides selectivity on individuals from three sugarcane families after different chemical managements in primary selection fields (F1). On the field, a randomized block design with five replications in a split plot scheme was used. Twelve herbicide treatments were allocated in the plots and the three seedlings families were allocated in the sub-plots. The herbicides treatments were T1-tebuthiuron POST -i + ametryn POST -t ; T2-(diuron + hexazinone) POST -i + ametryn POST -t ; T3-sulfentrazone POST -i + ametryn POST -t ; T4-(diuron + hexazinone) POST -i + metribuzin POST -t ; T5-sulfentrazone POST -i + metribuzin POST -t ; T6-imazapyr IPP; T7-imazapyr IPP + ametryn POST -t ; T8-imazapyr IPP + metribuzin POST -t ; T9-imazapyr IPP + tebuthiuron POST -i ; T10-imazapyr PPI + (diuron + hexazinone) POST -i ; T11-imazapyr IPP + sulfentrazone POST -i and T12-weeded control. Families were F400 ( ♀ IAC086155 x ♂ ?), F43 ( ♀ IACBIO264 x ♂ IAC911099) and F14 ( ♀ IACSP991305 x ♂ GlagaH). For each individual, the intoxication symptoms and the chlorophyll content on the leaves (40 and 120 DAA pós-i ), the percentage of live seedlings and selected seedlings (240 DAA pós-i ) were evauated. The chemical management with alternative treatments (T2 to T11) was selective to the three seedlings families because it caused slight intoxication symptoms and interference in the chlorophyll content, in addition to the high percentage of survival that allowed the plants selection for the later stage (F2). The management with herbicide applied in incorporated pre-planting (IPP) was highlighted as selective even when supplemented after the establishment phase of seedlings (POST-t).Keyword: Saccharum spp., breeding, phytotoxicity, selectivity. RESUMO -Esta pesquisa objetivou estudar a seletividade de herbicidas a indivíduos de três famílias de cana-de-açúcar, após diferentes manejos químicos em campos primários de seleção massal (F1

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Plasmodesmos: transporte simplástico de herbicidas na planta

Cited by 6 publications

References 33 publications

Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses

Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses

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

Sugarcane Seedlings Influenced by the Management with Herbicides

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