Imazethapyr inhibition of acetolactate synthase in<i>Rhizobium</i>and its symbiosis with pea

Royuela, Mercedes; González, Amalia Rodríguez; Arrese‐Igor, Cesar; Tejo, Pedro María Aparicio; González‐Murua, Carmen

doi:10.1002/(sici)1096-9063(199804)52:4<372::aid-ps730>3.0.co;2-p

Cited by 17 publications

(16 citation statements)

References 40 publications

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“…Furthermore, Leu, Ile, Val (the branched chain amino acids) increased in both cultivar nodules upon osmotic stress. ALS activity (the first enzyme in the branched chain amino acids pathway) in Rhizobium is high (Gonzalez et al 1996), when inhibitors of the enzyme (herbicides) are used and this contributes to a better survival of nitrogen fixing compared to nitrate-fed plants (Royuela et al 1998). Also, the aap double mutants of Rhizobium are unable to transport assimilated-N from bacteroids to the plant cells of the nodule.…”

Section: Contribution Of Nitrogen Compoundsmentioning

confidence: 99%

Understanding osmotic stress tolerance in leaves and nodules of two Phaseolus vulgaris cultivars with contrasting drought tolerance

et al. 2010

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Drought and salinity are environmental constraints that affect crop yields worldwide. In nature, both stresses are multifaceted problems that are usually associated with other adverse circumstances which limit plant performance such as water shortage and nutrient deficits. In order to assess common features of both stresses, the effects of mannitol-induced osmotic stress were monitored using two Phaseolus vulgaris cultivars, Cv. 'Flamingo' (tolerant) and Cv. 'Coco Blanc' (sensitive) which differed in their drought and salinity tolerance. Growth, water relations, organic and inorganic compound accumulation and soluble protein contents were measured in leaves and nodules of these N 2 -fixing plants. The aim of the present study was to check whether osmotic stress tolerance is associated with accumulation of some of these compounds either in leaves, nodules or both organs. At the whole-plant level, Cv. 'Flamingo' showed a better maintenance of plant biomass and shoot water status. At the cell level, this was related to a better osmotic adjustment ability both in leaves and nodules and also to a better adjustment of the cell wall elasticity. At the metabolic level, the contrasting accumulation of the different amino acids in nodules of each cultivar suggested that amino acids pathways can be regulated to different degrees under stress conditions. At the metabolic level, it seems that symbiosis in the sink organ (the nodule) plays a crucial role in conferring drought and salinity tolerance in the common bean.

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Section: Contribution Of Nitrogen Compoundsmentioning

confidence: 99%

Understanding osmotic stress tolerance in leaves and nodules of two Phaseolus vulgaris cultivars with contrasting drought tolerance

et al. 2010

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“…Herbicide application can bring undesirable consequences to soil microorganisms, depending on the active compound, commercial formulation, dose (Royuela et al, 1998), climatic conditions and soil type (Silva et al, 2003). Data presented in Figure 1 show that number and dry weight of nodules/plant significantly increased with two hand hoeings and nonweeded treatments, compared to other treatments.…”

Section: Effects On Soybean Plant Nodulation and Nitrogen Content Of mentioning

confidence: 99%

Growth, nodulation, and yield of soybean and associated weeds as affected by weed management

Abdelhamid

El-Metwally

2008

Planta daninha

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o número, peso fresco e seco dos nódulos, raiz, caule e peso seco total da planta, enquanto duas capinas manuais aumentaram significativamente das características citadas. Duas capinas manuais e os herbicidas de pré-emergência aplicados nas doses recomendadas aumentaram o rendimento da soja e seus atributos. Duas capinas manuais produziram maiores números de vagens por planta, peso de vagem por planta e número de sementes por planta em 140,7; 150,0 e 59,8%, respectivamente, comparado ao tratamento capinado. Por outro lado, oxadiargyl aplicado na dose recomendada (480 g ha -1 ) apresentou maior rendimento de semente (g planta -1 ), rendimento de semente (kg ha -1 ) e rendimento biológico (g planta -1 ) que o tratamento sem capina em 87,3; 85,0 e 88,2%, respectivamente. Prometryn na dose de 1,50 kg ha -1 , seguido de duas capinas manuais produziu a maior percentagem de proteína na parte aérea e sementes como também de óleo na semente, comparado a outros tratamentos de controle de plantas daninhas.Palavras-chave: Glycine max; herbicidas, manejo de plantas daninhas.ABSTRACT -Two field experiments were conducted at the experimental farm of the National Research Centre at Shalakan, Kalubia Governorate, Egypt, during 2006 and 2007 seasons, to study the effect of three pre-emergence herbicides, prometryn [at the rate of 0.75, 1.5 and 2.25 kg ha -1 ], oxadiargyl [at the rate of 240, 480 and 720 g ha -1 ] and butralin [at the rate of 1.20, 2.40 and 3.36 kg ha -1 ], two hand hoeing treatments and a nonweeded check, on weed infestation, nodulation, growth, yield and yield attributes of soybean plants. Two hand hoeing treatments resulted in the highest weed depression expressed as the lowest fresh and dry weights of broadleaved, grassy and total weeds. The reduction percentage in weed dry matter compared to the nonweeded treatment was 98.3, 92.64 and 96.9% in broadleaved, grassy and total weeds, 856 respectively. Application of the three herbicides at higher or recommended doses significantly reduced fresh and dry weight of the weeds compared to the nonweeded treatment. The results indicated that all the three herbicides at rates higher than the recommended markedly decreased the number, fresh and dry weight of nodules as well as root, shoot and total dry weight plant -1 , while application of two hand hoeing treatments significantly increased these traits. Two hand hoeing treatments and pre-emergence herbicides at the recommended rates markedly increased soybean yield and its attributes. Two hand hoeing treatments gave the highest values of number of pods per plant -1 , weight of pods per plant -1 and number of seeds per plant -1 by 140.7, 150.0 and 59.8%, respectively, compared to the nonweeded treatment. On the other hand, oxadiargyl at the recommended rate (480 g ha -1 ) was the best treatment for promoting seed yield (g plant -1 ), seed yield (kg ha -1 ) and biological yield (g plant -1 ) compared to the nonweeded treatment by 87.3, 85.0 and 88.2%, respectively. Prometryn at the rate of 1.50 kg ha -1 , followed by two...

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“…A aplicação de herbicidas em culturas que realizam simbiose com bactérias fixadoras de nitrogênio atmosférico pode prejudicar a eficiência na assimilação desse nutriente (Marenco et al, 1993;Royuela et al, 1998;Santos et al, 2004). Esses prejuízos devem-se à interferência do herbicida no metabolismo do microssimbionte, na planta hospedeira ou em ambos (Arruda et al, 2001).…”

Section: Introductionunclassified

Nodulação e crescimento de variedades de soja RR sob aplicação de glyphosate, fluazifop-p-butyl e fomesafen

Dvoranen¹,

Oliveira

Constantin

et al. 2008

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RESUMO -O objetivo deste trabalho foi avaliar os efeitos causados por aplicações dos herbicidas glyphosate, fluazifop-p-butyl e fomesafen, em diferentes formas de aplicação, sobre a nodulação e o crescimento inicial de duas variedades de soja RR. Os tratamentos foram organizados em arranjo fatorial 6 x 2, no qual foram avaliadas seis formas de aplicação de herbicida (testemunha sem herbicida, aplicação seqüencial de fomesafen/fomesafen, aplicação seqüencial de fomesafen/[fomesafen+fluazifop-p-butyl], fluazifop-p-butyl em aplicação única, aplicação seqüencial de glyphosate/glyphosate e glyphosate em aplicação única) e duas variedades de soja (BRS 245 RR e BRS 247 RR). Com relação à nodulação, a aplicação seqüencial de fomesafen/fomesafen foi a forma mais seletiva. A variedade BRS 245 RR mostrou-se mais tolerante do que a variedade BRS 247 RR às aplicações dos herbicidas. Número e matéria seca de nódulos da variedade BRS 247 RR são reduzidos por aplicações em dose única de fluazifop-p-butyl e glyphosate.Palavras-chave: fixação biológica, herbicida, Rhizobium, simbiose, transgênicos.ABSTRACT -The objective of this work was to evaluate the effects of the herbicides glyphosate, fluazifop-p-butyl and fomesafen, applied by different methods, on nodulation and initial growth of two glyphosate-resistant (GR) soybean varieties. Treatments were arranged in a 6 x 2 factorial, with six herbicide application methods (no-herbicide check, fomesafen/fomesafen sequential application, fomesafen/[fomesafen+fluazifop-p-butyl sequential application], fluazifop-p-butyl single application, glyphosate/glyphosate sequential application and glyphosate single application) and two soybean varieties (BRS 245 RR and BRS 247 RR). Regarding soybean nodulation, fomesafen/ fomesafen sequential application was the most selective herbicide application method. Variety BRS 245 RR was more tolerant than BRS 247 RR to the herbicides evaluated. Number and dry weight of nodules decreased after single applications of fluazifop-p-butyl and glyphosate.

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Imazethapyr inhibition of acetolactate synthase inRhizobiumand its symbiosis with pea

Cited by 17 publications

References 40 publications

Understanding osmotic stress tolerance in leaves and nodules of two Phaseolus vulgaris cultivars with contrasting drought tolerance

Understanding osmotic stress tolerance in leaves and nodules of two Phaseolus vulgaris cultivars with contrasting drought tolerance

Growth, nodulation, and yield of soybean and associated weeds as affected by weed management

Nodulação e crescimento de variedades de soja RR sob aplicação de glyphosate, fluazifop-p-butyl e fomesafen

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