What are Photosynthates examples?
The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks. For example, the highest leaves will send photosynthates upward to the growing shoot tip, whereas lower leaves will direct photosynthates downward to the roots.
What are Photosynthates used for?
Photosynthate has four major fates or uses: growth, storage, expenditure for tissue maintenance [mostly protein turnover (Penning de Vries et al., 1974) and ion balance against leakage], and expenditure for operation (root ion uptake, especially).
Are flowers Photosynthate sinks?
Developmental stage plays a large role in partitioning, organs that are young such as meristems and new leaves have a higher demand, as well as those that are entering reproductive maturity—creating fruits, flowers, and seeds. Many of these developing organs have a higher sink strength.
How does Photosynthate flow?
Translocation: Transport from Source to Sink. Photosynthates are produced in the mesophyll cells of photosynthesizing leaves. From there, they are translocated through the phloem where they are used or stored. Photosynthates move through plasmodesmata to reach phloem sieve-tube elements (STEs) in the vascular bundles.
What does Photosynthate mean?
photosynthesis
: a product of photosynthesis.
Why is the upper part of the leaf greener than the lower part?
The upper surface of leaf is greener than its lower surface because of the presence of mesophyll cells which contains chlorophyll. Due to more amount of chlorophyll on the upper surface more light energy is trapped hence more amount light of green wavelength is reflected.
Why do leaves get water and sugar out?
Answer: Leaves contain water which is necessary to convert light energy into glucose through photosynthesis. Photosynthesis is the process by which plants use light energy to convert carbon dioxide and water into sugars.
What is photo assimilation?
In botany, a photoassimilate is one of a number of biological compounds formed by assimilation using light-dependent reactions. This term is most commonly used to refer to the energy-storing monosaccharides produced by photosynthesis in the leaves of plants. Only NADPH, ATP and water are made in the “light” reactions.
What is a midrib of a leaf?
Hint: Midrib is the central, thicker, linear structure, which runs from the plant thallus or lamina, and the Midrib is usually seen in the true leaves, as the vein running from the leaf base to the apex, its main functions are to provide support and it is a translocative vessel.
Why can a root be both a source and a sink?
Belowground organs of plants (e.g. roots and rhizomes) are sinks during plant growth since they cannot perform photosynthesis. Some organs are both a source and sink. Leaves are sinks when growing and sources when photosynthesizing.
When would a seed be a sink?
Water test: Take your seeds and put them in a container of water. Let them sit for about 15 minutes. Then if the seeds sink, they are still viable; if they float, they most likely will not sprout.