User talk:Nhip1/sandbox

Plants are sensitive to light; the intensity of light can monitor the growth of plants. Therefore, it is important for plants to be able to detect and regulate their growth based on the amount of light that they receive. Like human, plants also propose a behavior of protection themselves from sunburn. Arabidopsis thaliana is a small flowering plant that has been a great model for studies and researchers. They are short-live plants and have an efficient ability in growth and reproduction, which is good model for the studying of UV protection in plants.

An adequate amount of sunlight promotes photosynthesis in plants; however, too intense amount of sunlight can lead to damaging plants. Plants put out specific photoreceptors for different wavelength, this is to ensure that plants can capture all the possible sunlight and utilize it for growth. Yet, they also experience sunburn from UV light. Indeed, having a mechanism to protect themselves from damaging is crucial for their surviving, especially against UV-B light. When plants detect an accumulation of UV-B light, the UV resistant locus8 (UVR8) photoreceptors starts a signal cascade in which upregulating gene expression that are importance for protecting plants from such intense light conditions. The signal cascade starts off by having UV-B light turn inactive homodimer form to active monomeric form, which then binds to COP1. Free-COP1 inhibits HY5; yet, when COP1 binds to UVR8, this stabilizes bZIP and allowing more gene expression downstream. In return, proteins that are necessary for DNA repair, UV-B receptor, and others proteins that help capture sunlight and repair damaging in plant tissue are being synthesized.

They have two group of samples: one is the control that contain normal UVR8 expression and the other is UVR8 mutant. Growth the plants in the same conditions to see how they respond to UV-B light. The results show that control plans reveal normal expression of other protein that are involved in DNA damage repair, and antioxidant pathway. However, they didn’t see the same outcomes as the control group, so their conclusion is UBR8 plays important role in protecting plants from UV damage.

In particularly, plants are sessile organisms, and evolution had led plants to develop such abilities to thrive through the change of environments. Acquiring the ability to protect themselves from sunlight damaging reveals their ability to sense environments’ changes and responds to the conditions.