Banca de DEFESA: JAYANE KARINE PEREIRA DE ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JAYANE KARINE PEREIRA DE ARAÚJO
DATE: 22/12/2020
TIME: 09:00
LOCAL: sala virtual: meet.google.com/eej-ubwk-nbi
TITLE:

 

BIOMETRIC CHARACTERIZATION OF DIASPORES AND SEEDS AND VEGETATIVE PROPAGATION OF Cordia oncocalyx (Allemão) Baill.

KEY WORDS:

seedling production, semiiferous propagation, cuttings, dry forests.

PAGES: 143
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Cordia oncocalyx (Allemão) Baill, popularly known as pau-branco is an endemic species of the Caatinga and has multiple uses. Due to the lack of information to enable its perpetuation and conservation, studies related to biometric evaluation, as well as the propagation are important for the production of seedlings of the species. The aim of this study was to analyze the biometric characteristics of diaspores and seeds manually and by digital image analysis, in order to compare the best evaluation method. In addition, to analyze in vitro, ex vitro, and cuttings of C. oncocalyx, with a view to optimizing the production of seedlings of the species. For the determination of biometric parameters by manual and digital method, 300 diaspores and 300 seeds were used. Subsequently, the ex vitroemergency was performed, testing the treatments in the diaspores: control (without scarification), scarification in the peduncular region with and without hydration for 24 hours, scarification in the region opposite the peduncle with and without hydration for 24 hours, scarification in the lateral with and without hydration for 24 h, scarification with immersion in sulfuric acid for 90 min and for 180 min. Finally, in vitro germination was tested, using different compositions of the culture medium: 12 g.L^-1 of sucrose and 1.80 g.L^-1 of M&S medium; 12 g.L^-1 of sucrose and 0.90 g.L^-1 of M&S medium; 6 g.L^-1 of sucrose and 1.80 g.L^-1 of M&S medium; 6 g.L^-1 of sucrose and 0.90 g.L^-1 of M&S medium. For the evaluation of the effect of the time of collection and the use of indolbutyric acid (IBA) on the rooting of cuttings of C. oncocalyx, the propagules were collected in Mossoró-RN, in April and July 2019, and in February 2020 The AIB concentrations tested were 0; 2000; 4000 and 8000 mg.L^-1. With regard to the use of AIB and the pyroligneous extract in rooting C. oncocalyx, the cuttings were immersed in AIB solution at concentrations of 0; 2000; 4000 and 8000 mg.L^-1 and pyroligneous extract at 0; 10; 100; 500 and 1000 ml.L^-1. In relation to the determination of the optimal rooting time, evaluations were made regarding oxidation, swelling, presence of calluses and rooting at the base of the cuttings. Regarding the results obtained, it was demonstrated that digital image processing is a viable and fast technique in obtaining biometric parameters for diaspores and seeds. Chemical and mechanical treatments in the diaspores did not promote the emergency. The composition of the culture medium influenced the percentage of in vitro germination, with the maximum value (96% of germination) observed with 6 g.L^-1 of sucrose and 0.90 g.L^-1 of M&S medium. Seminiferous propagation of C. oncocalyx can be successfully performed when the seeds are germinated in vitro and digital image processing shows solidity and applicability with a view to the evaluation of quantitative parameters of C. oncocalyx fruits and seeds. In the semiarid, the cutting of C. oncocalyx must be carried out in the rainy season, right after the emission of the shoots and using 2000 mg.L^-1of IBA. Based on the results found, it is concluded that the use of IBA and EP, in shoots collected at the beginning of the dry season, are not indicated as inducers of adventitious rooting in cuttings of C. oncocalyx. It was found that the cuttings need to remain in the propagation environment for about 76 days, to achieve 100% rooting. It was also observed that digital image analysis proved to be a fast and accurate tool in obtaining the length and number of roots, as well as providing additional characters, such as area and perimeter of the roots of C. oncocalyx. Therefore, it is concluded that the present study contains silvicultural information that can contribute to the production of seedlings and perpetuation of C. oncocalyx.

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