RESUMO
In vitro strategies were applied for the selection of eye-spot resistant variants from susceptible sugarcane cultivar Co 419 Different selective units (callus and leaf) of the susceptible cultivar were subjected to sub-lethal to lethal doses of toxins (culture filtrate and partially purified toxin) of H. sacchari, with the objective of improving the efficacy of in vitro selection protocols. All the selective units gave more or less similar response with culture filtrate, but a distinct response was observed when leaf was subjected to partially purified toxin treatment. The response was characterised by the degree of resistance exhibited by the regenerated seedlings.
Assuntos
Ascomicetos/química , Cruzamento , Imunidade Inata , Micotoxinas/farmacologia , Técnicas de Cultura de Órgãos , Doenças das Plantas/genética , Folhas de Planta , Plantas Comestíveis/efeitos dos fármacos , Seleção GenéticaRESUMO
The single dose anticoagulant rodenticide, bromadiolone (0.005%) and the acute rodenticide, zinc phosphide (2%) were evaluated in the paddy fields during Samba and Thaladi seasons for two crop stages, viz. 20 and 40 days after transplantation. Three baiting methods namely, burrow, station and burrow+station were adopted for both rodenticides. Both the rodenticides were exposed for one and two days in the partitioned plots. In the plots with 20 days after transplantation, the two day exposure of both rodenticides in burrow+station baitings during both seasons cleared cent percent rodent population. The cost-benefit ratio of the employed rodenticides favoured zinc phosphide than bromadiolone. Thus, zinc phosphide is deemed to be an economic rodenticide than bromadiolone and it can be suggested for the control of rodent population with two day exposure by burrow+station baiting methods preferably 20 days after transplanted paddy fields in both seasons.