Physiology
Chapter 2 : Circulatory system
Focus:
Plants transport systems Water and mineral uptake Xylem and transport Phloem, sugar and translocation
Keong BP
An overview of plant transport system
Keong BP
Water and minerals uptake
1. Bulk Flow Transport via Xylem. 2. Transport of Water and Minerals into Xylem. 3. Absorption of Water and Minerals by Root Cells
Keong BP
3. Absorption of Water and Minerals by Root Cells
Keong BP
Water and mineral uptake by the root hairs through apoplastic and symplastic route
Keong BP
Transmembrane route, water and solutes move in and out along the continuum
Keong BP
Movement of water and mineral via apoplastic route is blocked by Casparian strip but movement of water and mineral via symplastic route continues and ended in xylem vessels.
Keong BP
Water and mineral are now ready for upward transport into the shoot system.
Keong BP
2. Transport of Water and Minerals into Xylem.
Cohesion of water molecules and adhesion of water molecules with hydrophilic walls of xylem cells assists in movement of sap from down to upward in the stem.
Keong BP
1. Bulk Flow Transport via Xylem.
The air in these spaces is saturated with water vapour, that is higher water potential.
c b
a Air outside leaf is drier, that is, it has lower water potential
Keong BP
a. Water vapour diffuses from the moist air spaces of the leaf to the drier air outside via stomata. b. The loss of water is compensated by drawing water from mesophyll cells into the spaces of mesophyll. c. Subsequently, loss of water in the mesophyll cells are replenished by drawing out of water from xylem.
Keong BP
Low water potential
Transpiration pull
Adhesion and Cohesion
High water potential
Keong BP
Xylem and transport
Xylem: There are two types of water-conducting cells of xylem, tracheids and vessel element. Tracheids could be found in nearly all of the vascular plants. Vessels element could be
Focus:
Plants transport systems Water and mineral uptake Xylem and transport Phloem, sugar and translocation
Keong BP
An overview of plant transport system
Keong BP
Water and minerals uptake
1. Bulk Flow Transport via Xylem. 2. Transport of Water and Minerals into Xylem. 3. Absorption of Water and Minerals by Root Cells
Keong BP
3. Absorption of Water and Minerals by Root Cells
Keong BP
Water and mineral uptake by the root hairs through apoplastic and symplastic route
Keong BP
Transmembrane route, water and solutes move in and out along the continuum
Keong BP
Movement of water and mineral via apoplastic route is blocked by Casparian strip but movement of water and mineral via symplastic route continues and ended in xylem vessels.
Keong BP
Water and mineral are now ready for upward transport into the shoot system.
Keong BP
2. Transport of Water and Minerals into Xylem.
Cohesion of water molecules and adhesion of water molecules with hydrophilic walls of xylem cells assists in movement of sap from down to upward in the stem.
Keong BP
1. Bulk Flow Transport via Xylem.
The air in these spaces is saturated with water vapour, that is higher water potential.
c b
a Air outside leaf is drier, that is, it has lower water potential
Keong BP
a. Water vapour diffuses from the moist air spaces of the leaf to the drier air outside via stomata. b. The loss of water is compensated by drawing water from mesophyll cells into the spaces of mesophyll. c. Subsequently, loss of water in the mesophyll cells are replenished by drawing out of water from xylem.
Keong BP
Low water potential
Transpiration pull
Adhesion and Cohesion
High water potential
Keong BP
Xylem and transport
Xylem: There are two types of water-conducting cells of xylem, tracheids and vessel element. Tracheids could be found in nearly all of the vascular plants. Vessels element could be