Avaliação da qualidade de sementes sucupira-preta (Bowdichia virgilioides Kunth.) pelo teste de raios X

Abstract

RESUMOInjúrias representam um fator limitante para a viabilidade de sementes e, dependendo da sua intensidade, podem reduzir o seu vigor, produzindo plântulas fracas e, conseqüentemente, mais susceptíveis às condições adversas. Nesta pesquisa, foi verificada a eficiência do teste de raios X na avaliação de danos em sementes de sucupira-preta e sua relação com o teste de germinação. Inicialmente, as sementes foram expostas a diferentes intensidades de radiação por diferentes tempos, sendo, em seguida, as sementes divididas em três categorias, de acordo com as imagens visualizadas nas radiografias: sementes sem danos, com pequenos danos e danos severos. O experimento foi conduzido em esquema fatorial 3x3, correspondendo a três lotes e três categorias de sementes. As variáveis analisadas foram a porcentagem e índice de velocidade de germinação. Pelos resultados foi observado que a intensidade de 30 Kv por 45 segundos permite melhor visualização dos danos nas sementes de sucupira-preta, danos esses que afetam a germinação.Termos para indexação: Germinação, injúria, semente florestal. ABSTRACTInjuries represent a limitng factor for the seed viability. Depending on their intensity, the injuries might reduce seed vigour, produce weak seedlings. Consequently, they might be more susceptible to adverse conditions. In this research, the efficiency of X ray test was verifie to evaluate damage in seeds of black sucupira and its relation with germination test. Initially, seeds were exposed to different intensities of radiation for different periods. Next, seeds were separated in three categories according to the images obtained in radiographs: seeds without damage, seeds with little damage and seeds with severe damage. The experiment was conducted in factorial system 3x3, corresponding to three lots and three categories of seeds. The variable analyzed were percentage and germination speed index. It was verified that the intensity of 30 Kv per 45 seconds allowed better visualization of damages in seeds of black sucupira. Damages affect wich severely seed germination.

Seed Quality Evaluation of Senegalia polyphylla (DC.) Britton & Rose

“…Among the categories, the one with the highest percentage of seeds was that of full seeds, which differed statistically from the categories of malformed seeds and with small damage, which had smaller percentages. The pattern of seeds percentage for each category found in the present study was observed by other authors, such as Albuquerque & Guimarães (2008) with sucupira-preta seeds (Bowdichia virgilioides) and Carvalho et al (2009) with species of Lauraceae.…”

X-ray test to evaluate the physiological potencial of Platypodium elegans Vog. Seeds (Fabaceae)

“…In seeds of sucupira (Bowdichia virgilioides Kunth.) submitted to a radiographic analysis, the intensity of 30 kV for 45 seconds was efficient to verify the internal parts of the seeds (Albuquerque and Guimarães 2008). The image analysis of the seeds of Platypodium elegans Vog., obtained through the tests of x-ray, was efficient for the evaluation of the internal condition of the sedes (Figure 1).…”

“…For these authors, the obtained data attests that the assumption that the internal morphology of the seeds can be an indication of their viability. For Albuquerque and Guimarães (2008), the x-ray test in seeds of Bowdichia virgilioides, when related to the germination test, can help in the evaluation of the physical quality of the seeds. The external simultaneous analysis of the seeds of the Platypodium elegans Vog., their respective radiographed images, normal seedlings and in state of dormancy or dead seeds deriving from the test of germination, permitted the diagnosis for each studied case.…”

“…The morphophysiological quality evaluation of the seed groups is an essential process, which is of great importance for several phases of the production chain of the sector of seed production, significantly contributing for the maintenance and quality enhancement of this input. (de Melo et al, 2009;Albuquerque and Guimarães, 2008). The environmental compensations, like the compulsory replacement of native forests in rural properties, and the recovery of degraded areas, aiming at facing federal and state laws, prompted an increase in seed demands of native arbor forest species, which constitute basic input in the replacement and conservation programs of the ecosystem.…”

Image analysis and health of Moringa oleifera seeds

“…as a promising technique for the study of forest seeds, contributing to their quality control by permitting the selection and disposal of seeds with poor physical and physiological quality (Albuquerque & Guimarães, 2008).…”