Caracterização de linhagens de cártamo (Carthamus tinctorius L.) em condições de deficiência hídrica e reidratação

• Autor(a) principal: Bortolheiro, Fernanda Pacheco de Almeida Prado [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/136094; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/04-02-2016/000858666.pdf
• topic: Linhagem (Genética); Secas; Plantas oleaginosas - Morfologia; Desidratação (Hídrica); Plantas oleaginosas - Fisiologia; Linkage (Genetics)

Safflower is barely known and explored in Brazil, but has been shown as an interesting alternative for inclusion in crop rotation systems in the Cerrado region. The culture is rustic, tolerant to cold and water deficiency, what make it an option for cultivation in the off-season. The objective of this work was to evaluate the morphology and physiology of six safflower lines under water deficit. The experiment was carried out in a greenhouse in pots contend approximately 300 L of soil. The treatments were arranged in a randomized block design in factorial scheme 6 x 2. The first factor was composed of six lines of safflower (IMA 02, IMA 04, IMA 10, IMA 14, IMA 16 e IMA 21), and the second was the two water regimes (without and with water deficiency). All the boxes were kept at field capacity (FC) to 55 days after seeding (DAS), after the plants were exposed to water deficiency stress for a period of 30 days. The treatment without deficiency (-D) plants were hydrated in 100 field capacity (FC), while in the treatment with deficiency (+D) plants were maintained with 50% FC. After the period of 30 days, the plants were rehydrated for 18 days, in this period were carried out evaluations of leaf water potential, chlorophyll content, relative water content, protoplasmic tolerance, dry mass of root, shoot and flowers, root/shoot ratio, plant height, number of flowers per plant, harvest index, weight of thousand grains and grain yield. There is genetic variability among the six safflower lines for all traits evaluated. The lines IMA 04, IMA 10 and IMA 21 had better recovery of morpho-physiological characteristics after the water deficit and rehydration, in that, the line IMA 14 had better values of number of chapters per plant, relative water content in leaf, and dry matter of the shoot and root; and the line IMA 10 stood out in the variables contents of chlorophyll a, b, total, carotenoids and SPAD index ...