Response of Phaseol Us Vulgaris To a Single Generation of Meloidogyne Incognita

Melakeberhan, Haddish; Webster, John; Brooke, R. C.

doi:10.1163/187529285x00256

Cited by 15 publications

(11 citation statements)

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“…The decrease in the shoot mass seems to be very closely related to the root growth, and might be a consequence of the strong carbon sink represented by gall formation and the emission of new secondary roots (Oteifa & Elgindi, 1962;Wallace, 1971;Hutangura et al, 1999). Decrease of photosynthesis in plants infected by nematodes has been observed by several authors (Hussey, 1985;Melakeberhan et al;1985). Although photosynthesis was not measured in our study, in the three experiments there were no differences between cultivars in terms of total plant mass, which suggests that net carbon assimilation was similar, and therefore one may assume that the decrease in the shoot mass was a consequence of the preferential carbon distribution to the roots.…”

Section: Nitrogenmentioning

confidence: 81%

“…Some reports detected an increase of N in the roots but no alteration in the shoots (Hunter, 1958;Shafiee & Jenkins, 1963) while others showed that there was no alteration in the roots and shoots (Melakeberhan et al, 1985;Gonçalves et al, 1995). However, none of these reports dealt with N absorption by using a split root system or carried out short term experiments as done here.…”

Section: Nitrogenmentioning

confidence: 99%

“…This higher translocation to the shoot was not evidenced by the data of total amount in the plant, probably because it was masked by a significant reduction in the shoot. Melakeberhan et al (1985) studied the uptake and translocation of several nutrients, including Ca, in common bean plants infected with different inoculum levels of M. incognita, 21 days after inoculation. They observed that a reduction in the shoot dry weight was associated with an increase of the Ca concentration in the leaves with increasing inoculum levels, although infected plants had absorbed less than healthy plants.…”

Section: T O T a L C A I N T H E R O O T S ( M G )mentioning

confidence: 99%

“…Bergeson (1966) studied the mobilization of several minerals in tomato infected with M. incognita and concluded that the nematode caused an increase in their concentration in the roots but not in the leaves, indicating that transport to the shoot was not affected. In common bean (Phaseolus vulgaris L.) plants, M. incognita caused reduction of total N in the whole plant and in the roots, but the total content in the shoots was not changed, although the concentration of N and Ca in the roots and shoots had increased (Melakeberhan et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

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Uptake and translocation of nitrogen, phosphorus and calcium in soybean infected with Meloidogyne incognita and M. javanica

Carneiro

Mazzafera

Ferraz³

et al. 2002

Fitopatol. bras.

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Two soybean (Glycine max) cultivars were used in this study, Ocepar 4, rated as moderately resistant to Meloidogyne incognita race 3 but susceptible to M. javanica, and 'BR 16', susceptible to both nematodes. The effect of nematodes infection on the uptake and transport of N, P and Ca to the shoot was studied in plants growing in a split root system. The upper half was inoculated with 0, 3,000, 9,000 or 27,000 eggs/plant while the lower half received 15N, 32P or 45Ca. Infected plants showed an increase of root but a decrease of shoot mass with increasing inoculum levels. In general, total endogenous nutrients increased in the roots and tended to decrease in the shoots with increasing inoculum levels. When concentrations were calculated, there was an increase in the three nutrients in the roots, and an increase of Ca but no significant variation of N and P was observed in the shoots. The total amount of 15N in the roots increased at the highest inoculum levels but 32P and 45Ca decreased. In the shoots there was a reduction of 32P and 45Ca. The specific concentrations of the labelled nutrients (abundance or radioactivity/tissue mass) also showed a decrease of 32P and 45Ca in the shoots and roots of infected plants and an increase of 15N in the shoots. Considering that overall nutrient concentrations reflect cumulative nutrient uptake and the data from labelled elements gave information at a specific moment of the infection, thus nematodes do interfere with nutrient uptake and translocation.

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Section: Nitrogenmentioning

confidence: 81%

Section: Nitrogenmentioning

confidence: 99%

Section: T O T a L C A I N T H E R O O T S ( M G )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Uptake and translocation of nitrogen, phosphorus and calcium in soybean infected with Meloidogyne incognita and M. javanica

Carneiro

Mazzafera

Ferraz³

et al. 2002

Fitopatol. bras.

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show abstract

“…Plant parasitic nematodes induce changes in host tissues at or around their feeding sites or when migrating through plant tissues (20), by removing cell contents and by inducing pathogenic effects (3,10) that affect plant growth and cause loss of yield (20). The degree of host damage varies with the growth stage or susceptibility of the host plant (4,20,23), feeding habit (20), pathogenicity (21) and population density of nematodes (32) and is also influenced by environmental factors (17,33).…”

mentioning

confidence: 99%