Lec21.transport - Transport of Water in Plants Transport...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 ± Transport processes ± Short distance ± Processes that work on only a small scale: diffusion ± Within a cell or over a small number of cells ± Long distance ± Movement over many cell lengths ± Non-essential in aquatic plants and non-vascular land plants Transport of Water in Plants Transport of Water in Plants Transport of Water in Plants
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Significance of Water in Plants ± Long distance transport ± Essential for land plants of any size ± Requires evolution of vasculature ± Roots can penetrate and get deeper water sources (and nutrients) ± Stems can raise themselves above the soil for ± Competition for light ± Conspicuousness of flowers and fruits ± Transport of pollen and fruits/seeds ± Channel nutrients to areas where they are needed ± E.g., a leaf providing photosynthates to a growing meristem ± Excellent solvent ± Therefore a good medium for transport of many molecules ± Non-polar molecules have to be modified or packaged ± E.g., seed oils in oleosomes ± adhesive forces ± Under the right conditions cohesion allows water to be “pulled,” i.e., resist large negative pressure potentials ± Adheres to cell walls, interacts with polar molecules and ionically bonded molecules Water: Physiochemical Features
Background image of page 2
3 ± Low compressibility ± Allows for rapid changes in pressure (using osmosis) ± High heat capacity ± Buffers plants somewhat from transient temperature changes b/c they can absorb lots of heat without big changes in temperature Water: Physiochemical Features ± High boiling point ± Allows the plant to experience most
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Lec21.transport - Transport of Water in Plants Transport...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online