Infectividade de juvenis do segundo estádio de Meloidogyne incognita em tomateiro após privação alimentar em solo e água em diferentes condições

Freire, Eduardo Souza; Campos, Vicente Paulo; Dutra, Marcos Roberto; Rocha, Fernando da Silva; Silva, Juliana Resende Campos da; Pozza, Edson Ampélio

doi:10.1590/s0100-54052007000300010

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…The loss of infectivity is faster in J2 subjected to high temperatures. Van Gundy et al (1967) found a 63% reduction in the infectivity of J2 of M. incognita stored for 16 days at 25 • C. In another study a reduction of 98% of infectivity was observed in J2 of M. incognita stored for only 6 days at 28 • C (Freire et al, 2007).…”

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confidence: 95%

Variation in lipid reserves of second-stage juveniles of Meloidogyne exigua in a coffee field and its relationship with infectivity

Rocha

Campos

Souza

2010

Nematol

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In this study we assessed the variations in lipid content of second-stage juveniles (J2) of Meloidogyne exigua, recovered from a coffee field, by staining and quantifying the neutral lipids using image analysis. Our results showed that annual variations in J2 stained lipid area correlate with temperature, rainfall and total number of J2 per 100 cm 3 of soil. Laboratory and glasshouse experiments showed that decreases in the lipid stained area of J2 of M. exigua led to decreased infectivity and reproduction on tomato. The susceptibility of tomato cvs Kada and Nemadoro to M. exigua varied according to the stained lipid area of the J2 inoculated on roots. Only J2 containing an average of 80% stained lipid area were able to infect cv. Nemadoro, which contains the Mi resistance gene, whereas J2 containing 20% stained lipid area were still able to infect cv. Kada, considered to be highly susceptible. In this study we show for the first time the dynamics of lipid variation in J2 of M. exigua in a coffee field and the dependence of infectivity and parasitism on the resistance level of tomato cultivars and the lipid stained area in J2.

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confidence: 95%

Variation in lipid reserves of second-stage juveniles of Meloidogyne exigua in a coffee field and its relationship with infectivity

Rocha

Campos

Souza

2010

Nematol

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“…Antes do preparo da área para o plantio, foram realizadas coletas de amostras de solo e de raízes de plantas daninhas para análise de nematoides. Em virtude da ocorrência de alta população de juvenis de Meloidogyne sp, foi realizado controle preventivo por meio da irrigação diária, durante 14 dias antes da semeadura e revolvimento do solo por três vezes, nesse intervalo, visando a expor os juvenis eclodidos, reduzindo assim suas populações Freire et al, 2007). Após esse período, realizou-se nova amostragem e houve redução considerável nas populações de nematóides.…”

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Crescimento do meloeiro Cantaloupe sob manejo de irrigação por gotejamento em Janaúba, Minas Gerais

2012

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Growth of Cantaloupe melon under drip irrigation management in Janaúba, Minas GeraisWater management for the melon crop is undoubtedly one aspect that requires more care, since the hydric needs are very variable. This study aimed to analyze the vegetative development of the cantaloupe "Coronado F1" melon under simplified irrigation management, in the soil and climatic conditions of the semi-arid region of Minas Gerais (Janaúba MG). The experiment was conducted in the campus of UNIMONTES in Janaúba-MG, arranged in randomized blocks with five treatments and four replicates. The treatments consisted of: T1 (control): management recommended by the literature, T2: 50% ECA (evaporation of the Class-A tank), T3: 75% ECA, T4: 100% ECA, T5: 125% ECA. The evaluated carachteristics included: the length and width of the plant, number of fruits/plant, length of the longest branch, the shaded area for the soluble solids content (° Brix), sorting of fruits at the time of harvest, fruit weight, shape and business productivity relationship. Twenty fruits were analyzed plot. The results indicated that it is possible to use as irrigation management, the simplified methodology based on fractions of the Class-A tank compared with the methodology recommended by the literature for the planting of Cantaloupe "Coronado F1" melon and that the different fractions did not influence the characteristics of postharvest of the crop. Crescimento do meloeiro Cantaloupe sob manejo de irrigação por gotejamento em Janaúba, Minas Gerais O manejo de água para a cultura do meloeiro é, sem dúvida, um dos aspectos que exige mais cuidados, isto porque as necessidades hídricas são bastante variáveis. Este trabalho teve por objetivo analisar o desenvolvimento vegetativo da variedade de meloeiro Cantaloupe "Coronado F1", sob manejo de irrigação simplificado, nas condições edafoclimáticas do semiárido mineiro (Janaúba-MG). O experimento foi realizado no Campus da UNIMONTES, em Janaúba-MG; o delineamento utilizado foi o de blocos casualizados, com cinco tratamentos e quatro repetições e os tratamentos foram: T1(testemunha): manejo recomendado por literatura; T2: 50% ECA (evaporação do tanque Classe-A); T3: 75% ECA; T4: 100% ECA; T5: 125% ECA. Avaliaram-se o comprimento e a largura da planta, o número de frutos/planta, o comprimento do maior ramo, a área sombreada. Para o teor de sólidos solúveis (°Brix), a classificação dos frutos na colheita, o peso do fruto, a relação de formato e a produtividade comercial, utilizaram-se 20 frutos/parcela. Os resultados indicaram que é possível utilizar como manejo da irrigação o método simplificado, baseado em frações do tanque Classe-A, em comparação com o método recomendado pela literatura para o plantio do meloeiro Cantaloupe "Coronado F1" e que as diferentes frações não influenciaram as características de pós-colheita do meloeiro.Palavras-chave: "Coronado F1", tanque Classe-A, semiárido.

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“…The survival and infectivity of free-living, entomopathogenic and plant-parasitic nematodes depend on body energy reserve, formed during the embryonic development, and available during the period of food deprivation (Bergeson, 1959;Van Gundy et al, 1967;Lee & Atkinson, 1977;Selvan et al, 1993;Patel et al, 1997;Freire et al, 2007). The lipids in nematodes are triglycerides and other neutral lipids (Lee & Atkinson, 1977).…”

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confidence: 99%

Correlations among methods to estimate lipid reserves of second-stage juveniles and its relationships with infectivity and reproduction of Meloidogyne incognita

Rocha

Campos

Catão

et al. 2015

Nematol

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We studied the correlations between the processes used to estimate the body lipid of second-stage juveniles (J2) of Meloidogyne exigua and M. incognita, and the infectivity and reproduction of the M. incognita J2. The lipids were quantified by image analysis of the area stained red with Oil Red O dye and by the dark area of the non-stained J2. The content of neutral lipids of stained J2 of M. exigua and M. incognita correlated positively to the lipid index, body mass lipid and the dark area of J2. The period of incubation of J2 decreased the neutral lipids content and correlated significantly with the reductions of infectivity and reproduction. The period of 6 days incubation of M. incognita resulted in losses of more than 50% of the neutral lipid content, representing the threshold period for infectivity on tomato, whereas, for reproduction, the threshold was 3 days incubation.

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Infectividade de juvenis do segundo estádio de Meloidogyne incognita em tomateiro após privação alimentar em solo e água em diferentes condições

Cited by 10 publications

References 4 publications

Variation in lipid reserves of second-stage juveniles of Meloidogyne exigua in a coffee field and its relationship with infectivity

Variation in lipid reserves of second-stage juveniles of Meloidogyne exigua in a coffee field and its relationship with infectivity

Crescimento do meloeiro Cantaloupe sob manejo de irrigação por gotejamento em Janaúba, Minas Gerais

Correlations among methods to estimate lipid reserves of second-stage juveniles and its relationships with infectivity and reproduction of Meloidogyne incognita

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