1. Chapter 39 Plant Responses to External and Internal Signals

2. Getting from a signal to a response involves three steps: Reception Transduction Response Chapter 39 Plant Responses to External and Internal Signals

3. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli

4. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli

5. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli

6. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli

7. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli

8. Reception Chapter 39 Plant Responses to External and Internal Signals Proteins change in response to specific stimuli.

9. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

10. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

11. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

12. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

13. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

14. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

15. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

16. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

17. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

18. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

19. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

20. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

21. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

22. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

23. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

24. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

25. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

26. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

27. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

28. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

29. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

30. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

31. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

32. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

33. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

34. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals

35. Transduction Chapter 39 Plant Responses to External and Internal Signals Second messengers transfer and amplify signals.

36. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

37. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

38. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

39. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

40. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

41. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

42. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

43. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

44. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

45. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

46. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

47. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

48. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

49. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

50. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

51. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

52. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

53. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes

54. Response Chapter 39 Plant Responses to External and Internal Signals Activation of enzymes.

55. Plant Hormones: Chapter 39 Plant Responses to External and Internal Signals

56. Plant Hormones: Auxin Produced in apical meristem Stimulates cell elongation Causes phototropism. Chapter 39 Plant Responses to External and Internal Signals

57. Plant Hormones: Cytokinins Produced in growing tissues Stimulates cell division. Chapter 39 Plant Responses to External and Internal Signals

58. Plant Hormones: Gibberellins Stimulates growth in leaves and stems. Chapter 39 Plant Responses to External and Internal Signals

59. Plant Hormones: Brassinosteroids Chemically similar to animal sex hormones Stimulates cell elongation and division. Chapter 39 Plant Responses to External and Internal Signals

60. Plant Hormones: Abscisic acid Maintains dormancy in seeds. Chapter 39 Plant Responses to External and Internal Signals

61. Plant Hormones: Ethylene Ripens fruit. Chapter 39 Plant Responses to External and Internal Signals

62. Plant Hormones: Remember these two: Auxin Ethylene Chapter 39 Plant Responses to External and Internal Signals

63. Responses to light Chapter 39 Plant Responses to External and Internal Signals

64. Responses to light Blue light is responsible for phototropism Chapter 39 Plant Responses to External and Internal Signals

65. Responses to light Blue light is responsible for phototropism Red light stimulates germination Chapter 39 Plant Responses to External and Internal Signals

66. Responses to light Blue light is responsible for phototropism Red light stimulates germination Far-red light inhibits germination and causes a plant to grow taller Chapter 39 Plant Responses to External and Internal Signals

67. Responses to light Blue light is responsible for phototropism Red light stimulates germination Far-red light inhibits germination and causes a plant to grow taller Why? Chapter 39 Plant Responses to External and Internal Signals

68. Biological Clocks Chapter 39 Plant Responses to External and Internal Signals

69. Biological Clocks Circadian rhythm is the 24-hour cycle of an organism Chapter 39 Plant Responses to External and Internal Signals

70. Biological Clocks Circadian rhythm is the 24-hour cycle of an organism. Photoperiodism is the physiological response to seasonal changes in light. Chapter 39 Plant Responses to External and Internal Signals

71. Photoperiodism Plants that bloom in fall or winter need short days to bloom Chapter 39 Plant Responses to External and Internal Signals

72. Photoperiodism Plants that bloom in fall or winter need short days to bloom Plants that bloom in spring or early summer need long days. Chapter 39 Plant Responses to External and Internal Signals

73. An experiment: Chapter 39 Plant Responses to External and Internal Signals

74. An experiment: Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

75. An experiment: Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants 24 hours

76. An experiment: Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

77. An experiment: Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

78. What happens if we interrupt the night with a brief flash of light?

79. Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

80. What’s your conclusion? Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

81. Another experiment: Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

82. Red light Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

83. Red and far red Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

84. Red, far red, red Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

85. Red, far red, red, far red Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

86. Conclusions? Chapter 39 Plant Responses to External and Internal Signals short day plants long day plants

87. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

88. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals statoliths

89. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

90. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

91. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

92. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

93. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

94. Other Stimuli: Gravity (gravitropism) Chapter 39 Plant Responses to External and Internal Signals

95. Other Stimuli: Gravity (gravitropism) Touch (thigmomorphogenesis and thigmotropism) Chapter 39 Plant Responses to External and Internal Signals

96. Other Stimuli: Gravity (gravitropism) Touch (thigmomorphogenesis and thigmotropism) Environmental stresses. Chapter 39 Plant Responses to External and Internal Signals

97. Herbivores Chapter 39 Plant Responses to External and Internal Signals

98. Herbivores Chapter 39 Plant Responses to External and Internal Signals

99. Herbivores Chapter 39 Plant Responses to External and Internal Signals

100. Herbivores Chapter 39 Plant Responses to External and Internal Signals

101. Herbivores Chapter 39 Plant Responses to External and Internal Signals

102. Herbivores Chapter 39 Plant Responses to External and Internal Signals

103. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva

104. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction

105. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

106. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

107. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

108. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

109. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

110. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

111. Herbivores Chapter 39 Plant Responses to External and Internal Signals wound chemical in saliva signal transduction synthesis of volatile attractants

112. Pathogens Chapter 39 Plant Responses to External and Internal Signals

113. Pathogens Chapter 39 Plant Responses to External and Internal Signals bacteria

114. Pathogens Chapter 39 Plant Responses to External and Internal Signals bacteria Plant recognizes specific pathogen

115. Pathogens Chapter 39 Plant Responses to External and Internal Signals bacteria Plant recognizes specific pathogen Signal transduction

116. Pathogens Chapter 39 Plant Responses to External and Internal Signals bacteria Plant recognizes specific pathogen Signal transduction Diseased tissue is sealed off and killed

117. Pathogens Chapter 39 Plant Responses to External and Internal Signals Dying cells release salicylic acid Plant recognizes specific pathogen Signal transduction Diseased tissue is sealed off and killed

118. Pathogens Chapter 39 Plant Responses to External and Internal Signals Dying cells release salicylic acid Plant recognizes specific pathogen Signal transduction Diseased tissue is sealed off and killed Signal transduction Systemic acquired resistance

119. Any questions?. Chapter 39 Plant Responses to External and Internal Signals