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A short period (15-30 min) at 30° C promotes germination of seeds of Lactuca sativa L. cv. Repolhuda in darkness. Far-red light reverses this stimulation, and the escape curves for phytochrome and high-temperature action are quite similar, indicating that the two factors act at a common point in the chain of events leading to germination. It is suggested that high temperature acts by decreasing the threshold of the active, far-red absorbing, form of phytochrome (Pfr) needed to promote germination.
Departamento de Bioquímica, Universidade Federal de Permambuco, 50. 000, Recife, PE, Brasil.
This article was published in the following journal.
The relationship between the phytohormones, gibberellin (GA) and abscisic acid (ABA) and light and temperature on seed germination is still not well understood. Here, we investigated the interaction b...
The success of a biological invasion relies on the environment and is closely linked to factors such as water and temperature. Invasive plant species display different seed characteristics, including ...
Heavy metal pollution, as well as greenhouse effect, has become a serious threat today. Both heavy metal and heat stresses can arrest seed germination. What response can be expected for seed germinati...
The integrative effects of Zn (0, 75, 150 and 200 mg l(-1) ) and temperature (25, 30 and 35 °C) on seed germination of the threatened Brazilian species Dimorphandra wilsonii were evaluated. Zn effe...
Thermogradient tables were first developed in the 1950s primarily to test seed germination over a range of temperatures simultaneously without using a series of incubators. A temperature gradient is p...
When patients have bowel surgery they are sometimes left with a stoma, where the small bowel exits onto the wall of the abdomen, not into the colon. Certain foods have been shown to increa...
Leafy vegetables are a natural source of dietary nitrate, which may reduce systolic blood pressure (BP). However, the evidence has been obtained from studies using nitrate solutions (i.e.,...
One of the most frequently investigated hypothesis of the pathophysiology underlying Seasonal Affective Disorder(SAD) or so called winter depression is a disturbance of circadian rhythms. ...
The purpose of this study is to determine: 1. the effect of ambient temperature on the rate of core temperature change from 1 to 3 hours after induction of anesthesia (linear phase...
The size of the prostate changes due to insertion of the radioactive seeds. We will measure the prostate size, before and after the procedure.
The initial stages of the growth of SEEDS into a SEEDLING. The embryonic shoot (plumule) and embryonic PLANT ROOTS (radicle) emerge and grow upwards and downwards respectively. Food reserves for germination come from endosperm tissue within the seed and/or from the seed leaves (COTYLEDON). (Concise Dictionary of Biology, 1990)
Very young plant after GERMINATION of SEEDS.
A thioredoxin subtype that is ubiquitously found in the plant kingdom. It reduces a variety of seed storage proteins and may play a role in the germination process of seeds.
Emission of LIGHT by a substance as its temperature is raised. It is sometimes called hot light in contrast to LUMINESCENCE.
A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. In seeds without an endosperm, they store food which is used in germination. In some plants, they emerge above the soil surface and become the first photosynthetic leaves. (From Concise Dictionary of Biology, 1990)