development of sunflower plants under different conditions of water supply
desenvolvimento de plantas de desenvolvimento de plantas de girassol sob diferentes condições de fornecimento de água

Clicks: 295
ID: 152220
2012
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Abstract
Usually lack or excess of water in the soil are harmful to plant development. Therefore, we aimed to evaluate the growth of sunflower plants under different water holding capacity (WHC). The experiment was carried out in a greenhouse; we used sunflower plants (Embrapa 122/V-2000) and four treatments: 60%, 80% and 100% of WHC and a in flooding level, in randomized blocks with four replications. Plants were evaluated weekly between stages V6 to R4. We evaluated the plant height, stem diameter, leaf chlorophyll content, leaves, stems, shoots and roots dry matter, number of leaves, leaf area, and the relationship between roots and shoot dry matter. The results showed that the sunflower plants had greater height and stem diameter when subjected to higher water availability, however, the greatest plant height did not mean a better development of the sunflower. In water stress the chlorophyll increased content was limited, and in treatments with high water availability, the content initially increased, but decreased in latest assessments. With respect to dry matter of stem, root and leaf, number of leaves and leaf area when under 60% of WHC was verified smaller values. For the root/shoot was observed higher values for treatment 60% of WHC. Thus, the better development of these plants was observed when exposed to 80 and 100% of the WHC.

A falta ou excesso de água no solo são prejudiciais ao desenvolvimento das plantas. Assim, o objetivo deste trabalho foi avaliar o crescimento de plantas de girassol em diferentes capacidades de retenção de água (CRA). O experimento foi realizado em casa de vegetação, com a variedade de girassol Embrapa 122/V-2000, sob o delineamento experimental em blocos casualizados com quatro tratamentos (60% CRA, 80% CRA, 100% CRA e condição de alagamento) e quatro repetições. As plantas foram avaliadas semanalmente entre os estádios V6 (caracterizado pela presença de seis folhas com no mínimo 4,0 cm) ao R4 (inicio da florescência). Avaliou-se a altura das plantas, diâmetro de caule, teor de clorofila, matéria seca das folhas, do caule, da parte aérea e das raízes, número de folhas, área foliar, e a relação entre a matéria seca da raiz e da parte aérea. Os resultados mostraram que as plantas de girassol apresentaram maior altura e diâmetro de colmo quando submetidas à maior disponibilidade de água. Nos tratamentos com estresse hídrico o aumento do teor de clorofila foi limitado, e nos tratamentos com maior disponibilidade hídrica o teor inicialmente aumentou, mas, nas últimas avaliações decresceu. Apesar da relação raiz/parte aérea ter apresentado maiores valores para o tratamento 60% da CRA, a área foliar, número de folhas, matéria seca do caule, da raiz, e da folha apresentou menores valores a 60% da CRA. Portanto, o melhor desenvolvimento dessas plantas foi observado quando submetidas a 80 e 100% da CRA.

Reference Key
dutra2012semina:development Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Carla Cristina Dutra;Eber Augusto Ferreira do Prado;Leandro Ramão Paim;Silvana de Paula Quintão Scalon
Journal frontiers in neuroendocrinology
Year 2012
DOI
DOI not found
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/8200
Keywords
Agriculture (General) helianthus annuus

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