Abstract
Knowing the relationship between the physical and physiological characteristics of native forest seeds is essential for the successful recovery of riparian forests. Thus, the work was carried out to analyze the physical and physiological parameters of seeds of native forest species for use in the recovery of riparian forests by direct seeding. Were evaluated the physical quality (water content, mass, the weight of one thousand seeds, and the number of seeds per kilogram), morphometric characteristics (length, width, and thickness), and physiological quality in the laboratory (viability) of Cassia grandis L.f., Enterolobium contortisiliquum (Vell.) Morong., Guazuma ulmifolia Lam., and Libidibia ferrea var. leiostachya (Benth.) LPQueiroz. The experiment in the field was implanted in a randomized block design (RBD) with four blocks, testing seeds treated to overcome the four species dormancy. The direct sowing was in 10 planting lines, each composed of 10 pits (30 x 30 x 30 cm), spaced 2.0 x 1.0 m. E. contortisiliquum seeds, despite having the highest values for physical and morphometric characteristics, and having a high percentage of germination, was the species with the lowest percentage of emergence in the field, being below G. ulmifolia, which has seeds of smaller size and weight, and L. ferrea var. leiostachya which, despite having low germination, was the second with the highest percentage of emergence. The study allowed us to observe that there was no direct relationship between the physical and physiological attributes of forest seeds and their ability to emerge.
Highlights
The germination of a seed is the result of metabolic processes, initiated from a greater intensification of the respiratory activity, resulting from the absorption of water, which degrades the reserve substances generating the consequent production of compounds rich in energy that allow the growth of the embryonic axisFLORESTA, Curitiba, PR, v. 51, n. 2, p. 255-262, abril/jun 2021.Jesus, J
We transported the fruits to the Forest Nursery of the Federal University of Sergipe, where they were dried in the shade and processed
We separated the seeds into lots, composed of different matrices, which were packed in transparent waterproof plastic bags, labeled and stored since 2011, in a cold chamber at the Department of Forest Sciences-University of Sergipe (UFS), at a temperature of 6-9 oC and 60 -65% relative air humidity, where they remained until the time of use in this study
Summary
The germination of a seed is the result of metabolic processes, initiated from a greater intensification of the respiratory activity, resulting from the absorption of water, which degrades the reserve substances generating the consequent production of compounds rich in energy that allow the growth of the embryonic axisFLORESTA, Curitiba, PR, v. 51, n. 2, p. 255-262, abril/jun 2021.Jesus, J. (CARVALHO; NAKAGAWA, 2012), physiological studies are fundamental for understanding this process in different forest species, both in laboratory conditions and in fieldwork. In Brazil, seed tests, such as the viability for plant species evaluation, occur according to the Seed Analysis Rules (BRASIL, 2009) and Instructions for Analysis of Forest Species Seeds (BRASIL, 2013) recommendations. Besides being fundamental to the physiological potential of the seed's knowledge, these analyzes offer information about the viability and vigor of the vegetative material analyzed (SILVA et al, 2014). It is essential to obtain data on the external characteristics of seeds, such as shape, dimensions, and color, which are relevant factors that can assist in the propagation of different plant species (FLORES et al, 2014)
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