65ª Reunião Anual da SBPC

E. Ciências Agrárias - 1. Agronomia - 4. Fitotecnia

SILICON ACTION ON CONTENT TOTAL CHLOROPHYLL IN PLANTS OF PEPPER EXPOSED TO WATER DEFICIENCY

Emilly dos Santos Pereira - Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amaz Talitha Soares Pereira - Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amaz Daniele Viana da Costa - Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amaz Railan do Nascimento Ferreira - Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amaz Eldenira Barbosa Uchôa - Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amaz Allan Klynger da Silva Lobato - Prof. M.sc./ Orientador- Núcleo de Pesquisa Vegetal Básica e Aplicada, Universid

INTRODUÇÃO:

On worldwide scale, pepper culture has big economic importance it is widely used by the population of several countries. In relation to productive performance of pepper plants, water deficit is a key a limiting factor to achieving adequate yield in protected cultivation or under field conditions. Silicon is considered a benefic element to higher plants with its absorption and deposition in cell walls of several organs such as leaf and stem can promote beneficial effects, and for this reason has been frequently linked to physiological, morphological, nutritional, and molecular aspects in plants.

OBJETIVO DO TRABALHO:

The objective of this study was to investigate the effect of silicon on content total chlorophyll of two Capsicum annuum cultivars exposed to the water deficit

MÉTODOS:

The study was carried out in the Instituto de Ciencias Agrárias (ICA) of the Universidade Federal Rural da Amazonia (UFRA), Belem city, Para state, Brazil (01°27’S and 48°26’W). The plants remained in green house without environment control, and minimum, maximum and medium temperatures were 22.1, 35.5, and 28.4°C, respectively. In this study were used seeds of pepper (Capsicum annuum L.) cvs. Ikeda and Vermelho Gigante. Substrate to plant growth was composed mix of sand and silic in proportion of 2:1, respectively. The container used to the plant growing was pot type Leonard with 2 L capacityThe determination of the photosynthetic pigments was carried out with 25 mg of leaf tissue. The samples were homogenized in the dark and in the presence of 2 mL of acetone at 80% (Nuclear). Subsequently the homogenate was centrifuged at 5.000 g by 10 minutes at 5ºC. The supernatant was removed and the total were quantified using spectrophotometer (Femto, model 700 S), according to the methodology of Lichtenthaler (1987). Data were submitted to variance analysis and when significant differences occurred the Scott-Knott test at 5% level of error probability was applied. Standard errors were calculated in all evaluated points. The statistical analysis was carried out with the SAS software.

RESULTADOS E DISCUSSÃO:

The application of progressive doses of silicon provoked increase in total chlorophyll in Vermelho Gigante cultivar, being reported in concentration of 0.99 mM the value maximum to this parameter. The levels of total chlorophyll presented contrasting behavior in two cultivars, being found positive results only in Vermelho Gigante cultivar. The water restriction normally promotes reduction in chlorophyll content due to inhibition of biosynthesis and degradation of these pigments. The beneficial response linked to silicon can be related to better water use, proportionating higher chlorophyll level, and also higher rigidness structural of tissues and by this reason can mitigate the effects produced by water deficit.

CONCLUSÕES:

Results obtained in this reveal study with Capsicum annuum cultivars submitted to water restriction and silicon application shown different results to two cultivars, with increase in only one Vermelho Gigante cultivar.

Palavras-chave: Capsicum annuum, silicon, water déficit.