Efeito de fatores ambientais e tolerância a herbicidas em três espécies de plantas daninhas da família Rubiaceae

The strong selection pressure exerted by intensive use of glyphosate in cultivated areas has selected populations of the Rubiaceae weed species Borreria latifolia (Aubl.) K.Shum. (broadleaf buttonweed), Galianthe chodatiana (Standl.) E.L. Cabral (galiante) and Richardia brasiliensis Gomes (Brazilian pusley) with differential sensitivity to this herbicide in the South region of Brazil. The control of these weeds with herbicides is troublesome and signals the need to incorporate management practices of ruderal flora and crops, more sustainable and that results in more efficient control for long-term. Therefore, it is very important to expand the information about their biology and management. This study aimed: (a) select efficient methods to overcome dormancy of B. latifolia and G. chodatiana and determine how they influence the kinetics of seeds germination; (b) analyze the effects of temperature, irradiance, pH, aluminum and salinity on seed germination and initial growth of the B. latifolia, G. chodatiana e R. brasiliensis seedlings; (c) evaluate tolerance to glyphosate levels in biotypes of B. latifolia, G. chodatiana e R. brasiliensis through dose-response curves and compare two methods to evaluate herbicidal control; (d) and evaluated the effectiveness of alternative herbicides in pre-emergence and in early and late post-emergence of the three species. The treatment with KNO3 2%/3h + gibberellic acid 400 ppm resulted in higher percentage of G. chodatiana seed germination. This treatment and also the dry heat (60°C/30 min) + KNO3 2%/3h were more effective in overcoming dormancy of B. latifolia. G. chodatiana and R. brasiliensis tolerate lower temperatures during the germination process, while B. latifolia tolerate higher temperatures. B. latifolia and R. brasiliensis are positive photoblastic while G. chodatiana is indifferent to the photoperiod. B. latifolia shows higher germination and early development in pH 3, while G. chodatiana and R. brasiliensis prefer pH range between 5 and 7. B. latifolia and G. chodatiana were more tolerant to the aluminum during the germination process than R. brasiliensis. Low salt levels were sufficient to reduce the seed germination of the three species. Some biotypes of B. latifolia and R. brasiliensis showed medium-high glyphosate tolerance, not being controlled by higher doses than recommended. The G. chodatiana specie was not controlled with the highest dose used, showing a high glyphosate tolerance. The sulfentrazone, s-metolachlor and saflufenacil herbicides sprayed in pre-emergence showed high efficacy both on B. latifolia and R. brasiliensis, while chlorimuron-ethyl and diclosulan were effective only on R. brasiliensis. In early post-emergence the fomesafen, lactofem and flumioxazin herbicides efficiently controlled plants of all species, while bentazon showed high efficacy only on B. latifolia. Noteworthy the susceptibility of the G. chodatiana specie for applications in early post-emergence, because the control effectiveness and the number of effective herbicides are reduced with increasing the plant age. Many treatments with tank mix or sequencial applications with glyphosate, were effective in controlling B. latifolia and R. brasiliensis plants in advanced stage of development.

Programa pró-equidade de gênero e raça da Prefeitura Municipal de Curitiba: estratégia para superar a divisão sexual de trabalho em uma instituição pública?

The objective of this study was to analyze if the pro equity program of gender and race in the PMC, changed the perception of the servants on the conception of sexual division of labor. The sexual division of labor is the concept that allows identifying and understanding the hierarchical relations (principal of hierarchization) based on the attribution of social and economic value most male occupations in relation female, besides that, considerers the female work‟s secondary and her salary supplement to the family income. And the principle of separation identifying the places occupies by man and woman in the institution (productive, reproductive, and domestic work) agreeing with the historical and social construction that associates woman to occupational sectors like “mastertship”, nursering and social assistance, considered an extension of the family functions like taking care and family affections. And the man is associate to engineer, technology information and occupations related to exact science all professions associate to reason, creating a bias of gender in labor relations. To identify possible inequalities of gender in the work ambiance, I have compared the initial basic duration of some careers, the ascension process to higher positions and the salary that both servants and servers in the PMC. Was also investigated the perception of implements and beneficiaries of the program, over the sexual labor division. The methodology used for conduct the investigation was the qualitative research interpretive character using the structured and semi structured interviewed as instruments of data collect. The interview was divided in two groups, to follow: a) implements of pro-equity program of gender and race and b) professors and engineers beneficiaries. The analyzes of documents provided by the Secretaria de Politícas para as Mulheres da Presidência da República and by the PMC complemented the investigative path of this research. Bring as result a perception of beneficiaries servants and implementing on a policy which provides for cultural changes in the institution and in the management of people. It should be noted that the program foresees that in its objectives identify the discriminatory relations of race, sexual orientation, generation and disable person who were not examined in this study. Factor that enables the continuation of the investigation process and is a suggestion for a future research.