Chapter 36 Transport in Vascular Plants

1. Chapter 36Transport in Vascular Plants

2. Chapter 36Transport in Vascular Plants

3. Chapter 36Transport in Vascular Plants Physical forces drive the transport of materials in plants over a range of distances.

4. Chapter 36Transport in Vascular Plants Selective permeability: Transport proteins allow plants to maintain an inner environment that is different from the outer environment.

5. Chapter 36Transport in Vascular Plants Proton pumps: ATP is used to pump H+ ions out of the cell. Transport proteins let them back in, but only if they bring along some other, desirable substance.

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36. Chapter 36Transport in Vascular Plants Water potential: Ψ = Ψs + Ψp For pure water open to the atmosphere, Ψ = 0

37. Chapter 36Transport in Vascular Plants Water potential: Ψ = 0 Ψ = 0

38. Chapter 36Transport in Vascular Plants Water potential: Ψ = 0 Ψ = 0

39. Chapter 36Transport in Vascular Plants Water potential: Ψ = 0 Ψp = 0 Ψs = -0.23 Ψ = -0.23 Water moves from high Ψto low Ψ.

40. Chapter 36Transport in Vascular Plants Water potential: Ψ = 0 Ψp = 0.23 Ψs = -0.23 Ψ = 0 Water moves from high Ψto low Ψ.

41. Chapter 36Transport in Vascular Plants Water potential: In biological membranes, water moves through protein channels called aquaporins.

42. Chapter 36Transport in Vascular Plants Three major “compartments” of plant cells:

43. Chapter 36Transport in Vascular Plants Three major “compartments” of plant cells: Apoplast – cell walls and extracellular space

44. Chapter 36Transport in Vascular Plants Three major “compartments” of plant cells: Apoplast – cell walls and extracellular space Symplastic – cytoplasm of cells connected by plasmodesma

45. Chapter 36Transport in Vascular Plants Three major “compartments” of plant cells: Apoplast – cell walls and extracellular space Symplastic – cytoplasm of cells connected by plasmodesma Vacuole – surrounded by a membrane called the tonoplast.

46. Chapter 36Transport in Vascular Plants Local transport can be…

47. Chapter 36Transport in Vascular Plants Local transport can be… Apoplastic

48. Chapter 36Transport in Vascular Plants Local transport can be… Apoplastic Symplastic

49. Chapter 36Transport in Vascular Plants Bulk transport is for long distances xylem phloem

50. Chapter 36Transport in Vascular Plants Bulk transport is for long distances xylem phloem