Abiotic stress in seed germination and seedlings growth in hybrid and species of eucalyptus

• Grant number: 16/15087-2
• Support type: Scholarships in Brazil - Master
• Effective date (Start): January 01, 2017
• Effective date (End): February 28, 2018
• Field of knowledge: Agronomical Sciences - Forestry Resources and Forestry Engineering
• Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Rinaldo Cesar de Paula
• Grantee: Marcos Cláudio da Silva Virtuoso
• Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Cultivation of Eucalyptus species in Brazil is an important sector of the Brazilian´s economy covering a wide range of environments. The selection for materials for different conditions is one of the objectives of genetic improvement program of this species, but being a perennial plant, it takes many years to achieve results that are satisfactory. Look for ways to streamline the process, such as selecting the juvenile stage can minimize this problem. Thus this study aims to evaluate the effect of temperature, water and salt stress on seed germination and evaluate the performance of seedlings under water stress of species and hybrid of Eucalyptus: Eucalyptus camaldulensis, E. urophylla, E. brassiana, and . grandis, E. saligna and E. urophylla x E. grandis. The research will be divided into four experiments, the first three involve germination in the laboratory and the fourth experiment will be conducted with seedlings will be in the greenhouse. The first experiment will consist of a randomized block design in a factorial 5 x 6, five temperatures (20, 25, 30, 35 and 40 ° C) and the six genotypes. The second will also be a randomized block, but it will be subdivided portion 6 x 6 x 2, with the six genotypes submitted to six water potential (0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa), forming plots and two temperatures chosen from the previous experiment (the optimum temperature and the optimum above) as subplot. The third experiment will have the same arrangement of the above, but involving six potential saline (0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa). The last experiment will be in pots in the greenhouse, and the randomized block design in a factorial 3 x 6, three water regimes (20, 40 and 60% of the maximum soil water retention) and the six genotypes eucalyptus. The variables analyzed in laboratory experiments are: germination, germination speed index, dry mass, shoot length and root number of normal and abnormal plants, germination coefficient and mean germination time. In the greenhouse will be evaluated growth characteristics (collect diameter, plant height, leaf number, leaf area, fresh weight of shoot and root), physiological (photosynthetic rate, transpiration, stomatal conductance, leaf water potential, relative water content and stability of the membrane system) and biochemical (content of soluble and total carbohydrates). The data will be submitted to analysis of variance and F test and means were compared by Tukey test at 5% probability and regression analysis. (AU)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

VIRTUOSO, Marcos Cláudio da Silva. Estresses abióticos na germinação de sementes e no crescimento de mudas de espécies e híbridos de Eucalyptus. 2018. Master's Dissertation - Universidade Estadual Paulista "Júlio de Mesquita Filho" Faculdade de Ciências Agrárias e Veterinárias..