Fanuel Pereira da Silva

Mutantes morfológicos de algodoeiro herbáceo como fonte de resistência ao bicudo

This work aimed to evaluate the effects of three morphological mutants of upland cotton lines (Gossypium hirsutm L. r. latifolium Hutch.), isolated or in combination in the same cotton genotype, as a source of resistance to boll weevil, Anthonomus grandis Boheman, 1843 (Coleoptera, Curculionidae). The experiment was carried out in the field, under natural infestation, with a completely randomized block design arranged in a factorial 2× 3 plus an additional treatment, with four replications. In a multiple choice test, the character mutant frego bract presented the higher reduction on boll weevil oviposition damage (34.71%), in relation to the normal equivalent. The okra leaf reduced the boll weevil damage only when associated with frego bract (40%). The combination of the three mutant characters in the same plant presented the least square percent with oviposition damage (23.13%).

QTL detection of yield-related traits of cashew

The identification of quantitative trait loci (QTL) and marker-assisted selection with a view to breeding programs have aroused great interest, including for cashew improvement. This study identified QTL for yield-related traits: nut weight, male and hermaphrodite flowers. The traits were evaluated in 71 F1 genotypes of the cross CCP 1001 x CP 96. The methods of interval mapping and multiple QTL mapping were applied to identify QTL. Eleven QTL were detected: three for nut weight, four for male flowers and four for hermaphrodite flowers. The QTL accounted for 3.79 to 12.98 % of the total phenotypic variance and had phenotypic effects of -31.81 to 34.25 %. The potential for marker-assisted selection of the QTL hf-2f and hf-3m is great and the phenotypic effects and percentage of phenotypic variation higher than of the others.

Multiplicação in vitro de plantas juvenis de mamoeiro

The seminiferous propagation of Carica papaya L. presents a mixture of genotypes with a strong influence on fruit production costs, quality and yield , prevailing due to the lack of efficient protocols for vegetative propagation . In this context , the tissue culture emerges as a promising alternative, because it can provide, to farmers, sex determination in seedlings, with a high quality standard and enough amounts to supply commercial demands in all seasons . This study aimed at developing an in vitro micropropagation protocol from young papaya material, in two experiments. In the first experiment, the explants were multiplied in vitro and the cytokinins BAP, 2iP and KIN were tested at the concentrations of 0.0 mg L -1 , 2.5 mg L -1 , 5.0 mg L -1 and 10.0 mg L -1 , with the best results observed for 2iP, especially at the 2.5 mg L -1 concentration. In the second one, the 2iP cytokinin was used at the concentrations of 0.0 mg L -1 , 1.0 mg L -1 , 2.0 mg L -1 and 4.0 mg L -1 , with and without GA 3 (0.0 mg L -1 and 1.0 mg L -1 ), with beneficial effects of GA 3 observed in the multiplication process, especially when combined with 1.0 mg L -1 of 2iP, with the best results for plants height, number of leaves and explants sprouting.

Preferência de Bemisia tabaci biótipo B em linhagens mutantes de algodoeiro

The effects of cotton lines (Gossypium hirsutum L. r. latifolium Hutch.) with mutants morphologic characteristics: okra leaf, frego bract and red plant in relation to host plant resistance to whitefly (Bemisia tabaci bioyipe B Hemiptera: Aleyrodidae), were evaluated in choice or no choice assays. The assays were carried out in the greenhouse conditions, according to a completely randomized block design, in a 23 + 1 in a factorial arrangement with four replications. The mutant with red plant characteristic was less attractive and less preferred for oviposition than the normal green plant does, in both, whit or without choice tests. It did not have preference in relation to the form of the leaf and bract type.

QTL detection for physicochemical characteristics of cashew apple

The identification of quantitative trait loci (QTL) and marker-assisted selection have aroused great interest in breeding programs aiming at fruit quality. The objective of this study was to detect QTL related to the quality of the cashew apple. The physicochemical characteristics oligomeric phenolics, total soluble solids, total titrable acidity and vitamin C contents were analyzed in the mapped cashew population. QTL were detected by QTL interval and multiple QTL mapping. The results showed high phenotypic variation in the segregating F1 generation for all traits. Eighteen QTL associated with cashew quality were identified: three for oligomeric phenolics, five for total soluble solids, six for total acidity and four for vitamin C. QTL are promising for marker-assisted selection since they have the greatest phenotypic effects and contribution to phenotypic variation.