Banca de DEFESA: TÂMARA INGRYD BARBOSA DUARTE DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TÂMARA INGRYD BARBOSA DUARTE DE SOUZA
DATE: 23/03/2023
TIME: 09:00
LOCAL: CECA
TITLE:

MORPHOLOGICAL CHARACTERIZATION OF FRUITS, SEEDS AND SEEDLING AND SEED GERMINATION OF Euphorbia hyssopifolia Lam.

KEY WORDS:

Seed gemination. Leiteira. Germination ecophysiology.

PAGES: 70
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Matologia
SUMMARY:

The present work aimed to characterize the seeds of Euphorbia hyssopifolia from the physical and morphological point of view, to study the physiological potential of seeds as a function of temperature, light and water, as well as to monitor and record the post-seminal development. find out its water requirement and its longevity in soil conditions, flooding and high temperatures. For the physical characterization, eight repetitions of one hundred seeds and fruits were weighed and the weight of one thousand seeds determined, number of seeds per kilogram, and measures of central tendency were calculated for each variable. In the morphological characterization, the type, size and location of the embryonic axis were verified, as well as the location of the micropyle, funiculus and reserve material. In addition to these, the germination behavior of seeds (mature and mature) was studied as a function of constant temperatures of 20°C, 25°C, 30°C, 35°C and alternating 20-30°C in the absence and presence of light, adopting the factorial scheme 2 x 5 x 2 (seed maturation condition x temperature x light regime); of water volume (1.5; 2.0; 2.5; 3.0), seed burial time in the soil and high temperatures (80ºC, 100ºC, 120ºC and 140ºC) on their physiological potential, in the intervals of time of one minute and five minutes, the variables being analyzed: Percentage, speed, relative frequency of seed germination and seedling length. In the post-seminal development, the germination process was recorded during twenty days. After the period of the germination process, the seedlings were cut in the transition region called the collar, in order to carry out the study of the regrowth capacity. The experimental design was completely randomized, with four replications of 25 seeds for each treatment. The seed is testal and the embryo is of spatulate leaf-like subdivision. The germination is epigeal and its seedling is of the phanerocotyledonary type. Seedlings did not show regrowth capacity after being cut in the collar region. The highest percentage and speed of germination was obtained at the alternating temperature of 20-30ºC, in the presence of light. Its viability is rapidly lost after burial in soil, submersion in water and when exposed to high temperatures. These environmental conditions drastically affect its germination capacity and are relevant for the management of the species in agricultural areas.

BANKING MEMBERS:
Interno(a) - 1425368 - JOAO CORREIA DE ARAUJO NETO
Interno(a) - 332.041.954-49 - JORGE LUIZ XAVIER LINS CUNHA - UFAL
Externo(a) ao Programa - 3145739 - JOAO LUCIANO DE ANDRADE MELO JUNIOR