Germination of Stigmaphyllon blanchetii Seeds in Different Temperatures and Luminosity

Abstract

The objective of the present work was to study the influence of temperature and light on germination of seeds of Stigmaphyllon blanchetii, popularly known as rat tail. The first stage of the research evaluated the effect of three constant temperatures (20 oC, 25 oC and 30 oC) and an alternating temperature (20-30 oC). In the second stage, for simulation of different types of light, four conditions of luminosity (white, red, far red and absence of light) were used. The temperatures that provided the best germination and development for S. blanchetii are the constant (30 oC) and the alternating (20-30 oC) ones. The seeds germinated both in the presence and absence of light, but there was greater germination and seedling development in the absence of light; thus they were classified as preferential negative photoblastic seeds.

Light intensity and sowing depth on the emergence and development of weeds

“…The different light intensities were obtained using agricultural screens manufactured with black polyethylene (Sombrite ® ), which allow the passage of 70, 50, and 30% emergence. It is important to highlight that light is necessary for germination of a large number of weed species (Silva et al, 2019). Thus, some species have seeds that germinate only under rapid exposure to light and others that start this process after a long period of exposure, plus, seeds in which germination is triggered only in the dark and indifferent to light (Guimarães et al, 2018).…”

“…Light controls the beginning of the germination of photosensitive seeds and phytochromes are responsible for the perception and transduction of the light signal. This chromoprotein has two basic forms: an inactive form, which is activated by absorbing red light, inducing the production of Ga 3 and triggering the beginning of germination, and an active form, which is inactivated when illuminated with far-red light, with consequent production abscisic acid (ABA), inducing seeds to a state of dormancy (Silva et al, 2019). In addition to this, the perception of light quality occurs through phytochrome.…”

Germinação de sementes de Amaranthus deflexus L. submetidas a diferentes condições de tempera-tura e estresse salino

“…Ataíde et al (2016) found higher GSI in Melanoxylon brauna when grown at 30 ºC. For the species Stigmaphyllon blanchetii, the constant temperature of 30 ºC and alternating temperatures of 20-30 ºC provided an increase in GSI and germination percentage (E. M. Silva et al, 2019).…”

“…M. L. M. D. Silva et al (2016) also reported that water stress was harmful at any level, regardless of temperature, for the germination of Chorisia glaziovii. In the species Stigmaphyllon blanchetii, the constant temperature of 30 ºC and the alternating temperatures of 20-30 ºC provided better germination and seedling development (E. M. Silva et al, 2019).…”

Sowing depth and light intensity in the emergence and development of monocotyledonous weeds

“…It controls the beginning of germination of photosensitive seeds, and phytochromes are responsible for the perception and transduction of light signals. This chromoprotein has two basic forms: an inactive form, which is activated by absorbing red light, inducing the production of GA3 and triggering the beginning of germination; and an active form, which is inactivated when illuminated with far-red light, resulting in the production of abscisic acid (ABA), inducing a state of dormancy in seeds (Silva et al 2019).…”