Qualidade fisiológica de sementes de paineira em função do estádio de maturação, temperaturas cardinais e estresse salino
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Data
2011-07-11
Autores
Lemes, Eliane de Queiroz
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Universidade Federal do Espírito Santo
Resumo
The objective of this work to study the physiological maturity of seed cotton tree (Ceiba speciosa St. Hil.) In the highlands of the study Caparaó These germination of seeds under different temperatures and assess the germination behavior of seed cotton tree and the development of normal and abnormal seedlings under different conditions of salinity stress simulated with NaCl. The Studies Were Conducted in the mountainous region Caparaó municipality Guaçui - ES, where the trees Were Followed tagged on anthesis and the filling of fruit and seed development until it is fully ripe, fruit collection occurred weekly Conducted and Technology and the Laboratory of Seed Analysis Centre of Agricultural Sciences where UFES They Were Evaluated biometric characteristics of fruits and seeds, the color of fruit and seeds, humidity, fresh weight, dry weight and seed germination. To study the cardinal temperatures for germination tests Were Conducted with four sub-samples of 25 seeds in Petri dishes Placed lined with paper germitest, Kept in BOD chambers, where we tested the Following constant temperatures: 05, 07, 10, 15, 20, 25, 30, 35, 40 and 45 ° C. To Assess the germination and seedling development in different Concentrations of NaCl Treatments consisted of the osmotic potential: 0.0 (control), -0.2, -0.4, -0.6 and -0.8 MPa. The germination and seed vigor Were Evaluated for germination, first count, germination speed index average time of germination, relative frequency of germination, shoot length and root length, fresh and dry weight of seedlings and morphological characterization of normal and abnormal seedlings. The experimental design was Completely randomized design with four replications of 25 seeds. Regression equations were adjusted for the main characteristics evaluated, the data expressed in percentages were transformed into arc-sin v x/100 and averages compared by Scott - Knott and Tukey 5% level of probability. The harvest of seeds of Ceiba speciosa can be started at 163 days (22 weeks) after anthesis, at this stage the seeds were presented with dark brown and with a moisture content of approximately 37% and germination 87%. Seeds collected in the mountainous region of Caparaó presented wide range of germination between the temperatures and the optimum temperature for this species to 25 and 30 ° C. Salinity Caused a Decrease in the values of variables in the germination test. The Paineira is Considered glycophyte with maximum tolerance to NaCl up to -0.6 MPa
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Ceiba speciosa , Seeds , Germination , Seedling salinity , Ceiba speciosa , Plântulas
Citação
LEMES, Eliane de Queiroz. Qualidade fisiológica de sementes de paineira em função do estádio de maturação, temperaturas cardinais e estresse salino. 2011. 80 f. Dissertação (Mestrado em Ciências Florestais) — Universidade Federal do Espírito Santo, Centro de Ciências Agrárias, Jerônimo Monteiro, 2011.