Translocation of Nutrients

Leaves change color because of the translocation of nutrients. Nutrients are stored in the roots an in the Springtime these nutrients move up from the roots. In the Summer leaves are green because of the pigment known as chlorophyll. Chlorophyll is an expensive molecule because it has nitrogen and magnesium in it. It is always being bombarded with light, which carries the energy that is vital to the tree's food-making process, also known as photosynthesis. Leaves manufacture simple sugars from water and carbon dioxide, using the energy that is captured from the sun by chlorophyll. These simple sugars are the sole source of carbohydrates that trees need for growth and development. Next, as fall approaches, chlorophyll is being broken down and replaced at a slower rate. The flow of water and nutrients gradually is being closed off as the days get shorter, which cause a layer of cork cells to form at the base of each leaf. As the supply of chlorophyll reduces, all that is left is accessory pigments, which begin to slowly unmask and begin to show through. The accessory result in the beautiful and vibrant colors of reds, yellows, oranges, purples, and blended combinations of these colors, which we observe during the fall season. But once winter time approaches, chlorophyll is degraded, and beautiful colors begin to fade away, and the nutrients move back into the roots. These nutrients are no longer needed since photosynthesis does not occur in the winter. As a result the trees are bare until the whole process begins again in the spring time.

Category:

Science & Technology

Tags:

• science
• leaves
• tree
• nutrient

[Only1moomin]

Ever considered what happens to the sap at the leaf when 98% of the water drawn through evaporates away? Does it alter the density of the sap at the top of the tree? If not how is this possible? If yes why is it not mentioned in the science literature? Does a denser solution at the top of the tree migrate due to gravity and if so does this cause a return flow of less dense solution in the xylem? Of course it does! Google andrew k fletcher to get the true picture of circulation in trees & plants

[SamuelHammer]

really enjoyed that

sh