Tesis
Estudo de substâncias com efeito de regulador de crescimento no potencial fisiológico do arroz irrigado
Fecha
2012-02-17Registro en:
GROHS, Mara. Study of effect of substances with growth regulator the potential physiological irrigated rice. 2012. 89 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2012.
Autor
Grohs, Mara
Institución
Resumen
The objective of this study was to evaluate the interference of substances with effect of
growth regulator, applied to seeds in physiological quality of rice seed subjected to the
condition of low temperature stress, seeking to identify the enzymatic mechanism of action of
these products, well as their performance on the field, on different sowing dates and cropping
systems. For this reason, various experiments were conducted at the experimental of field and
in the laboratory using the phytohormone gibberellic acid, the insecticide thiamethoxam and
an organo-mineral fertilizer, Haf Plus®. In general, the products tested increased the
germination end of most rice cultivars, and their efficiency linked to the existence of low
temperature, with greater emphasis on the gibberellic acid, which also influence the final
germination, increases seed germination. In cold-sensitive cultivars, as Irga 424, there is no
influence of the products in the physiological. The products act beneficially on the antioxidant
system of plants, mainly on the activity of superoxide dismutase, reducing free radical
production and lipid peroxidation. However, the difference in vigour between the samples
were not sufficiently large so that manifest themselves in the field, for the establishment of
the crop. As environmental conditions become less favorable, as in an early planting season or
in the conventional tillage is a major contribution of the products on the agronomic
performance, not reflecting, however, on yield.