Banca de DEFESA: MARIA BEATRICE GUEIROS SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA BEATRICE GUEIROS SILVA
DATE: 28/02/2024
TIME: 09:00
LOCAL: sala do programa
TITLE:

VIGOR AND ENZYME ACTIVITY TEST FOR EVALUATION OF SESAME SEEDS CULTIVATED WITH DOSES OF PHOSPHORUS

KEY WORDS:

Ascorbate Peroxidase; Catalase; Fertilizing; Cultivars; Sesamum indicum L

PAGES: 89
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Produção e Beneficiamento de Sementes
SUMMARY:

Sesame (Sesamum indicum L.) is an oilseed with great economic potential, being explored on the national and international market. The physiological performance of the seed can be influenced by the availability of nutrients for the plant, which can directly reflect on the formation of the embryo, chemical composition, seed reserve structures, in addition to the development of an efficient antioxidant enzyme system, in order to react against the species reactive oxygen sources (ROS), generated by oxidative stress reactions, which cause seed deterioration. Therefore, it is of great importance to study the activity of nutrients, including phosphorus. The aim of the work was to evaluate the physiological quality and enzymatic activity of sesame seeds subjected to doses of organic phosphorus. The research was conducted in the experimental area of the Federal University of Agreste de Pernambuco – UFAPE. Seeds of two sesame cultivars, BRS Anahí and Trebol, were used, coming from plants fertilized with 50%, 100% and 150% of the P requirement with earthworm humus produced from agro-industrial waste and a control fertilized with NPK. The design adopted was completely randomized in a factorial scheme of (2x4), considering two sesame cultivars (C1 - BRS Anahí and C2 - Trebol). During the research, the following were evaluated: water content, weight of a thousand seeds, percentage of germination, percentage of viable seeds using the phenolphthalein test, abnormal seedlings, dead seeds, electrical conductivity, length, dry mass and fresh mass of seedlings and the enzymatic activity of catalase and ascorbate peroxidase, soluble carbohydrates and protein. The water content did not show a significant difference, with a moisture percentage of 5% for the seeds in all treatments. For both cultivars, the 100% P dose provided the highest germination percentage of 90 and 89% for Anahí and Trebol, respectively. While the lowest percentage of germination was observed in seeds from doses of 50% and NPK for the cultivars Trebol and Anahí, respectively. Electrical conductivity expressed a higher value for seeds that were subjected to a dose of 50%, for both cultivars, indicating greater deterioration. It was found that the 50% dose of P provided the shortest seedling length, while the greatest length was achieved at the 100% dose and in the NPK control. Plants subjected to 50% and 100% fertilization for cv. Anahí and 50% for cv. Trebol provided seeds with lower protein content. Phosphate fertilizer interferes with the physiological performance of sesame seeds and the dose of 100% of the P requirement, obtained from earthworm humus, is an alternative to be used as mineral fertilizer. The evaluation of the activity of antioxidant enzymes to determine the physiological potential of sesame seeds is indicated when used together with other vigour tests.

COMMITTEE MEMBERS:
Presidente - EDILMA PEREIRA GONCALVES
Interno - JEANDSON SILVA VIANA
Externa à Instituição - ADRIELLE NAIANA RIBEIRO SOARES TENORIO
Externa à Instituição - ISANELI BATISTA DOS SANTOS