"Reação de famílias de cana-de-açúcar (Saccharum sp.) em relação a Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949"
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2009-02-10
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Universidade Federal de Goiás
Resumo
The sugarcane crop has a special significance to the Brazilian economy that is a leading producing country. This crop is attacked by several pathogens and, amongst them are the nematodes of the genera Meloidogyne, that reduces the sugarcane yield. The use of chemical control, crop rotation, use of antagonistic plants and genetic control by
introducing resistant source genes as control measures have been searched. In this work families of sugarcane were evaluated with the purpose to identify the plant reaction to
Meloidogyne icognita. The trials were set up in a greenhouse at Universidade Federal de Goias, Goiania, GO. The seedlings were obtained from seeds or buds from the different
crosses tested. These seedlings were planted in sterilized substrate and artificially inoculated with M. incognita. In the trials evaluation the variable considered were fresh root weigh, final nematode population, reproduction factor (RF) and nematode population reduction in relation to the susceptible standart. Afterwards the families and individuals
were ranked as highly susceptible (HS), susceptible (S), little resistant (LR), moderately resistant (MR), resistant (R) or highly resistant (HR). In the trial with plants originated
from seeds, the crosses RB945961 x SP81-3250 and SP81-3250 x RB945961were ranked as LR, the others were S or HS. The RF ranged from 0.55 to 1.18. In the trial with plants
originated from buds, the crosses RB92804 x RB813804, RB865547 x RB855156, CP70-330 x ? and IAC86-2210 x SP70-1078 were considered LR and the others S or HS. The RF
ranged from 0.15 to 0.59. In both trials, the individual evaluation within the progenies there was higher frequency of individuals ranked as MR and R.
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TEIXEIRA, Renato Andrade. Reaction of sugarcane families (Saccharum sp.) to Meloidogyne incognita (Kofoid & White, 1919) Chitwood,1949. 2009. 70 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2009.