PHYSIOLOGICAL AND ENZYMATIC CHANGES DURING SEED MATURATION AND GERMINATION OF Luehea divaricata

Abstract

Luehea divaricata Mart. & Zucc is tree is of great ecological and economic importance. This study investigated the effect of fruit maturation on the germination and vigor of L. divaricata. Fruits were harvested at three maturity stages (unripe or green, brown and open) defined by digital colorimetry and seeds extracted from each stage divided into lots of earliest harvested and stored. Germination test was conducted with four replicates of 25 seeds from each fruit maturity stage in plastic boxes under temperature of 30 ± 2° C. The study was conducted in a 2 x 3 (two lots and three maturity stages) factorial arrangement in a completely randomized design with four replications. Data was submitted to analysis of variance and the means were compared by Tukey at 5%. Germination, germination speed index, average root length and moisture content showed higher values for recently harvested seeds extracted from fruits of all maturity stages compared to stored seeds. LEA protein showed higher activity in seeds from fruits with brown epicarp color of both lots while α-amylase protein activity was higher in the stored seed lot. This shows that better seeds are those that are newly collected fruits and browns.

Maturation and harvest time of Ateleia glazioveana Baill. seeds

“…However, after 28 days, seed germination began to increase as moisture decreased, which continued during maturation, suggesting a possible inverse relationship between the aforementioned variables (Figures 3 and 4). The data obtained in this study are corroborated by Schulz et al (2017), who evaluated germination and moisture content of seeds of Luehea divaricata (Malvaceae), a species characterized by dry and dehiscent fruits, as well as A. glazioveana, and concluded that the increase in germination percentage coincided with the reduction in moisture. Furthermore, the high water content in early development of the seeds is linked to the synthesis and metabolism of reserve substances such as proteins, starch, and lipids.…”

Germination and fungi incidence in Cerejeira-da-mata seeds at different fruit maturation levels and temperatures

“…Seeds removed from fruits that were on the ground, bright red fruits and yellow fruits with red spots exhibited the highest germination speed index, with a mean of 1.02, not different from one another. Evaluating the effect of physiological maturation on the germination of Luehea divaricate, Schulz et al (2017), observed that the germination speed index was highest in seeds obtained from fruits with green coloration than that of brown fruits. Brown-colored fruits corresponded to a stage of maturation more advanced than the that of fruits with green coloration.…”

Momento de colheita de sementes de <i>Albizia hasslerii</i> (Chod.) Burkart em função da cor do fruto

“…A. C. Smith (LOPES; NÓBREGA; MATOS, 2014); Luehea divaricata Mart. (SCHULZ et al, 2017); e Parapiptadenia rigida (Benth.) Brenan (BRAZ et al, 2018).…”