Banca de DEFESA: ANDRE LUCAS JANUARIO SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRE LUCAS JANUARIO SILVA
DATE: 23/02/2021
TIME: 14:00
LOCAL: Campus de Engenharias e Ciências Agrárias
TITLE:

24-EPIBRASSINOLIDE REDUCES WATER STRESS IN SOYBEAN PLANTS IN THE VEGETATIVE GROWTH PHASE

KEY WORDS:

Glycine max

Water deficit

Brassinosteroids

PAGES: 73
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Fisiologia de Plantas Cultivadas
SUMMARY:

Soybean is a crop of great economic importance worldwide, used in human and animal food, and also for the production of biofuel. The water deficit is the main limiting factor for the productivity of this crop in the world. Alternatives to minimize the impacts of the water deficit on plants involve the application of plant bio-regulators, among which are the Brassinosteroids.  Because of this, this work aimed to evaluate the efficiency of the 24-epibrassinolide bioregulator in soybean plants (Glycine max (L.) Merrill), submitted to stress by water deficit. The experiment was conducted in a 2x2 factorial scheme, with 8 repetitions. The treatments consisted in the application or not of the hormone at a concentration of 0.1 mg/L, as well as the presence or absence of hydric stress. The soybean seeds of IMA 84114 RR were sown and the application of the bioregulator was performed at 12 days after sowing, with subsequent applications every 5 days. The experiment was carried out in the vegetative phase, and the hydric suppression was imposed on the 27th day after planting (DAP). The maximum period of water deficiency was determined by the withering of the soybean plants, followed by rehydration. The data of the parameters evaluated in the experiment were submitted to the analysis of variances at 0.1, 1 and 5% probability by the F test, and when a statistically significant difference was observed, the Tukey Test was used to compare the means. Gas exchange, water status, chlorophyll fluorescence, morphological attributes and soy production components were affected by the water deficit. However, the 24-EPiBL attenuated the negative interferences caused by water deficiency in these parameters. Thus, the foliar application of 24-epibrassinolide in the vegetative phase alleviates the harmful effects of water deficit on gas exchange, improves the water status of the plant, as well as helps in the maintenance of photosynthetic pigments, reducing the damage caused by water deficit to the photosynthetic apparatus. Furthermore, after the rehydration of the plants, the 24-Epibrassinolide improves the growth, development and consequently the productivity of the soybean crop.

BANKING MEMBERS:
Presidente - 1347716 - VILMA MARQUES FERREIRA
Interno - 1916144 - GILBERTO COSTA JUSTINO
Externo à Instituição - SEBASTIAO DE OLIVEIRA MAIA JUNIOR - UFCG