Germination and morphology of seeds and seedlings of Colubrina glandulosa Perkins after overcoming dormancy

Abstract

The objectives of the present study were to morphologically characterize the seeds, study post-seminal development, and report the best treatment to overcoming dormancy of colubrina (Colubrina glandulosa Perkins). Eight replicates of 100 seeds were weighed and the length, width, and thickness of each seed were measured for the physical characterization. External and internal aspects were considered for the morphological description of the seeds. Seven pre-germination treatments were used to overcoming dormancy: (T 1) intact seeds; immersion in sulfuric acid for 60 (T 2) and 90 min (T 3); (T 4) manual scarification in the region opposite the hilum; (T 5) immersion in water at 80°C, followed by standing in the same water outside the heat for 24 hours at room temperature; and immersion in distilled water for 24 (T 6) and 48 hours (T 7). The germinative process was recorded for 19 days in the post-seminal study. The variables analyzed were germination, first count, speed, average germination time, germination uncertainty and synchrony, seedling length, and dry mass. This was a completely randomized designed study, with four replicates of 25 seeds in each treatment. The seeds were morphologically highly variable. The testal and the embryo were the invaginated type. Germination was epigeal and the phanerocotyledonal type. Manual scarification induced maximum germinability in the mean time, resulting in a unimodal distribution of the relative frequency and high synchronization of germination, which allowed for the maximum number of highly vigorous seedlings. These results indicate a treatment for overcoming dormancy in C. glandulosa.

Initial Growth of Cowpea Cultivars With an Increase of 4.8 ° C in Air Temperature / Crescimento Inicial De Cultivares De Feijão-Caupi Com Aumento De 4,8 ° C Na Temperatura Do Ar

“…This high percentage and germination speed may be related to the physiological quality of the seeds, since the greater the vigor, the greater the speed and germination rate (Padua et al, 2010). According to Melo Junior et al (2018), rapid germination favors the establishment of species, since the seeds are exposed to adverse environmental conditions for a long time.…”

“…Cowpea (Vigna unguiculata L.) is considered a key crop in the context of global climate change and food security (Carvalho et al, 2019).Because in addition to representing an accessible nutritional source, with a fundamental role in the balance of diets, due to its low fat content and high carbohydrate content (Gomes et al, 2019), it generates employment and income for family agriculture (Merwad et al, 2018;Rocha et al, 2016), especially in the Brazilian semi-arid region (Melo et al, 2018).…”

Physiological potential of lettuce seeds crespa

“…The results of the germination and emergence tests indicated statistical differences between cultivars, with Itaúna being superior when compared with the others (Table 2), indicating a high physiological potential of the seeds of this plant. However, the results of these tests do not guarantee similar postperformance, even when germination and emergence are high, since seed performance depends on their physiological potential and environmental conditions (Melo Junior et al, 2018).…”

Agricultura Orgânica No Estado De São Paulo

“…Entre os tratamentos pré-germinativos usados para a superação da dormência tegumentar, destacam-se as escarificações química ou mecânica, utilizando ácido sulfúrico (H 2 SO 4 ) e lixa, respectivamente, por apresentarem frequentemente os melhores resultados quanto à alta porcentagem de germinação (OLIVEIRA et al, 2012;ARAUJO et al, 2018). Além de proporcionar maior taxa de germinação, essas modalidades de escarificações também induzem um aumento na velocidade germinativa, pelo fato dessa variável está diretamente associada à velocidade da água que entra e é absorvida, em decorrência do desgaste tegumentar provocado pelas escarificações, acelerando as etapas de embebição, ativação dos processos metabólicos e a germinação (MELO JUNIOR et al, 2018).…”