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Photoblastic response of Japanese katsura tree seed germination [1] Photoblasticism is a mechanism of seed dormancy. Photoblastic seeds require light in order to germinate. [2] Once germination starts, the stored nutrients that have accumulated during maturation start to be digested which then supports cell expansion and overall growth. [3]
When ABA levels are higher than GA then that leads to dormant seeds and when GA levels are higher, seeds germinate. [25] The switch between seed dormancy and germination needs to occur at a time when the seed has the best chances of surviving and an important cue that begins the process of seed germination and overall plant growth is light.
These photoblastic seeds need a period of darkness or light to germinate. In species with thin seed coats, light may be able to penetrate into the dormant embryo. The presence of light or the absence of light may trigger the germination process, inhibiting germination in some seeds buried too deeply or in others not buried in the soil ...
Image Credit: 123RF. Not all seeds sprout at the same rate. While environmental conditions may alter germination time (e.g., if the soil is too cold, tomato seeds may take longer to germinate ...
As the name would suggest this type of response is triggered by very low levels of light and is thought to be mediated by phytochrome A. [1] It can be initiated by fluences as low as 0.0001μmol/m 2 up to about 0.05μmol/m 2. [2] Germination of Arabidopsis can be induced with very low levels of red light, as can oat seedlings. Such low levels ...
Ficus plant grown under a white LED grow light. A grow light is an electric light that can help plants grow. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated (typically a varying combination of red and blue light, which generally appears pink to purple to the human eye).
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