Accelerated Aging Essay - 1502 Words

The application of priming treatment before accelerated aging aims to reduce damage caused to the seeds, to confer increased tolerance to oxidative stress and, to compare the treatments before and after artificial aging. Primed seeds with ascorbic acid showed a higher concentration of CO2 than those primed with water, followed by the control treatment, for Janauba provenance. Priming also affected seeds from Pedro J. Caballero, which had a higher concentration of CO2 when primed with water. This trend can be associated with seed moisture content (Table 3) because the correlation between concentration of CO2 with seed water content were 0.99 and 0.95 (P 0.0001) for seeds from Janauba and Pedro J. Caballero provenances, respectively.†¦show more content†¦Seeds from Janauba primed with ascorbic acid exhibit higher concentration of CO2 than those primed with water. On the contrary, seeds from Pedro J. Caballero demonstrated a higher concentration of CO2 for seeds primed with water than seeds primed with ascorbic acid. Seeds from Pedro J. Caballero responded with greater respiratory activity independent of priming treatment compared to those from Janauba. Despite the difference in respiratory activity between provenances, we did not notice loss of seed physiological quality. Therefore, the above-mentioned increase is related to seeds moisture content, that is higher in seeds from Janauba (Table 3). There was a significant positive correlation between concentration of CO2 and percentage of normal seedlings as well as with GSI from both provenances (Table 7). Consequently, an increase in respiratory activity resulted in higher percentage of normal seedlings emerged with greater speed. Table 7: Simple correlation coefficient between carbon dioxide concentration and physiological quality of J. curcas seeds after accelerated aging depending on provenance (Janauba and Pedro J. Caballero). Provenance Parameters NS GSI Janauba 0.59* 0.80** Pedro J. Caballero 0.88** 0.87** *,** Significant at the 1% and 5%. Wherein: NS: normal seedlings; GSI: speed germination index. Unprimed J. curcasShow MoreRelatedThe Geriatric Specialty Populations By. Hess852 Words   |  4 Pagesprovided. The assignment for this essay was to discuss health services for special populations. For this composition the author chose to discuss briefly geriatric population and the mental health populations, as well as the specialty care involved with these populations. These two populations are enormously in need of recognition; in both provided care and health care costs. Geriatrics is defined as the department of medicine dealing especially with the problems of aging and diseases of the elderly. NeverthelessRead MoreAssignment : Ageism In Society910 Words   |  4 Pages004-915-201 Whittaker, D.S. 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