EEB 304 Lecture 3 – Plant Manipulation and Naming

1. EEB 304 Lecture 3 – Plant Manipulation and Naming

2. Optional Assignment List the continents that would be included under the designations “Old World” and “New World” Return as hard copy or send by e-mail to receive credit Due Thursday 1/20/11

3. “What’s in a name? That which we call a rose By any other name would smell so sweet.”

4. “What’s in a name? That which we call a rose By any other name would smell so sweet.” Shakespeare, “Romeo and Juliet”

5. Mystery Plant - This plant is a native of the Old World that has multiple uses

6. Mystery Plant • - This plant is a native of the Old World that has multiple uses • It is used for its fibers to make rope, fishnets, clothing, etc.

7. Mystery Plant • - This plant is a native of the Old World that has multiple uses • It is used for its fibers to make rope, fishnets, clothing, etc. • - Because its importance as a source of fibers, it was widely planted in the U.S. midwest during World War II

8. Mystery Plant • - This plant is a native of the Old World that has multiple uses • It is used for its fibers to make rope, fishnets, clothing, etc. • - Because its importance as a source of fibers, it was widely planted in the U.S. midwest during World War II • It is also the source of a psychoactive drug, which has led to its possession and using being considered a criminal offense in the U.S.

9. Mystery Plant • - This plant is a native of the Old World that has multiple uses • It is used for its fibers to make rope, fishnets, clothing, etc. • - Because its importance as a source of fibers, it was widely planted in the U.S. midwest during World War II • It is also the source of a psychoactive drug, which has led to its possession and using being considered a criminal offense in the U.S. • In the 1960s and 1970s, court battles ranged that centered on the name for the plant, with both prosecution and defense enlisting the services of expert botanists.

10. Mystery Plant • - This plant is a native of the Old World that has multiple uses • It is used for its fibers to make rope, fishnets, clothing, etc. • - Because its importance as a source of fibers, it was widely planted in the U.S. midwest during World War II • It is also the source of a psychoactive drug, which has led to its possession and using being considered a criminal offense in the U.S. • In the 1960s and 1970s, court battles ranged that centered on the name for the plant, with both prosecution and defense enlisting the services of expert botanists. • What is the plant? • Why was there a dispute about its name? • What was the legal resolution of the issue about its name?

11. Quiz • A scientific name for an organism consists of how many words? In what language is it written? • What is polyploidy? How common is it in plants? Give an example of a crop species that is polyploid.

12. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species

13. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species Plants eaten regularly by people – ca 2,500 species

14. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species Plants eaten regularly by people – ca 2,500 species Plants in World Commerce – ca 150 species

15. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species Plants eaten regularly by people – ca 2,500 species Plants in World Commerce – ca 150 species Major Economic Importance – ca 20 species

16. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species Plants eaten regularly by people – ca 2,500 species Plants in World Commerce – ca 150 species Major Economic Importance – ca 20 species Crops recently domesticated – 0 species

17. Plant Manipulation – the Raw Material Flowering Plants – ca 300,000 species Plants eaten regularly by people – ca 2,500 species Plants in World Commerce – ca 150 species Major Economic Importance – ca 20 species Crops recently domesticated – 0 species

18. Crops of Major Economic Importance

19. Crops of Major Economic Importance Wheat, Rice, Maize (Corn), and Potatoes – the Big 4

20. Traditional Methods of Plant Manipulation • Selection • Polyploidy • Asexual Reproduction (=cloning) • Inbreeding

21. Variation and Selection Keystone of Evolutionary Theory – “Selection of the Fittest” Natural Selection – wild populations

22. Variation and Selection Keystone of Evolutionary Theory – “Selection of the Fittest” Natural Selection – wild populations Artificial Selection – when done by people

23. Variation and Selection • Keystone of Evolutionary Theory – “Selection of the Fittest” • Natural Selection – wild populations • Artificial Selection – when done by people • Note: For selection to work, there must be variation, and it must be heritable • mutations (natural and induced)

24. Variation and Selection • Keystone of Evolutionary Theory – “Selection of the Fittest” • Natural Selection – wild populations • Artificial Selection – when done by people • Note: For selection to work, there must be variation, and it must be heritable • mutations (natural and induced) • geographic variation

25. Artificial Selection in Cole Crops

26. Polyploidy Eukaryotic organisms, typically 2 sets of chromosomes/nucleus = diploid

27. Polyploidy Eukaryotic organisms, typically 2 sets of chromosomes/nucleus = diploid Gametes – have one set of chromosomes/nucleus (result of meiosis) = haploid

28. Polyploidy Eukaryotic organisms, typically 2 sets of chromosomes/nucleus = diploid Gametes – have one set of chromosomes/nucleus (result of meiosis) = haploid Some plants – cells have >2 sets of chromosomes = polyploid triploid = 3 sets

29. Polyploidy Eukaryotic organisms, typically 2 sets of chromosomes/nucleus = diploid Gametes – have one set of chromosomes/nucleus (result of meiosis) = haploid Some plants – cells have >2 sets of chromosomes = polyploid triploid = 3 sets tetraploid = 4 sets

30. Polyploidy Eukaryotic organisms, typically 2 sets of chromosomes/nucleus = diploid Gametes – have one set of chromosomes/nucleus (result of meiosis) = haploid Some plants – cells have >2 sets of chromosomes = polyploid triploid = 3 sets tetraploid = 4 sets pentaploid = 5 sets hexaploid = 6 sets etc.

31. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit

32. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit • “Even” polyploids (4x, 6x, 8x) – often fertile • organs can be larger, including fruits, seeds

33. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit • “Even” polyploids (4x, 6x, 8x) – often fertile • organs can be larger, including fruits, seeds • heterosis fixed

34. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit • “Even” polyploids (4x, 6x, 8x) – often fertile • organs can be larger, including fruits, seeds • heterosis fixed • Many crop plants are polyploid – see text, Table 1.1 • Coffee, Cotton, Potato, Strawberry, Sugar cane, Tobacco, Wheat

35. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit • “Even” polyploids (4x, 6x, 8x) – often fertile • organs can be larger, including fruits, seeds • heterosis fixed • Many crop plants are polyploid – see text, Table 1.1 • Coffee, Cotton, Potato, Strawberry, Sugar cane, Tobacco, Wheat • Even some crops that appear to be diploid are ancient polyploids: • Corn, sunflower

36. Polyploidy continued • “Odd” polyploids (3x, 5x, 7x) – usually sterile • advantage for seedless fruit • “Even” polyploids (4x, 6x, 8x) – often fertile • organs can be larger, including fruits, seeds • heterosis fixed • Many crop plants are polyploid – see text, Table 1.1 • Coffee, Cotton, Potato, Strawberry, Sugar cane, Tobacco, Wheat • Even some crops that appear to be diploid are ancient polyploids: • Corn, sunflower “Whole Genome Duplication” - WGD

37. Hybrid sterility

38. Polyploidy can overcome hybrid sterility

39. Inbreeding Most Plants are Outcrossing – gametes from different individuals

40. Inbreeding • Most Plants are Outcrossing – gametes from different individuals • Some plants, particularly weeds and crop plants, are inbreeding • self-fertilization • self-compatibility

41. Inbreeding • Most Plants are Outcrossing – gametes from different individuals • Some plants, particularly weeds and crop plants, are inbreeding • self-fertilization • self-compatibility • Forced Inbreeding: • increased homozygosity • inbreeding depression

42. Inbreeding • Most Plants are Outcrossing – gametes from different individuals • Some plants, particularly weeds and crop plants, are inbreeding • self-fertilization • self-compatibility • Forced Inbreeding: • increased homozygosity • inbreeding depression • Crossing between homozygous lines  Heterosis (hybrid vigor) • uniformity

43. Inbreeding • Most Plants are Outcrossing – gametes from different individuals • Some plants, particularly weeds and crop plants, are inbreeding • self-fertilization • self-compatibility • Forced Inbreeding: • increased homozygosity • inbreeding depression • Crossing between homozygous lines  Heterosis (hybrid vigor) • uniformity • need to produce new seed each year

44. Asexual Reproduction Asexual Reproduction  new plants identical to parent (clones)

45. Asexual Reproduction • Asexual Reproduction  new plants identical to parent (clones) • Applications of Asexual Reproduction: • vegetative propagation (cuttings, rhizome pieces etc.) • grafting

46. Naming of Plants Scientific Hierarchy of Classification (See Table 1.5, page 35) Kingdom Phyta “plants” Division Anthophyta “flowering plants” Class Magnoliopsida “dicots” Order Fabales “bean order” Family Fabaceae “bean family” Genus Phaseolus* “beans” Species P. vulgaris* “common bean” *Name written in Latin

47. Species Names – Binomial Nomenclature Prior to Linnaeus – use of Phrase Names

48. Species Names – Binomial Nomenclature Prior to Linnaeus – use of Phrase Names Linnaeus – each species called by genus name + species epithet = binomial

49. Species Names – Binomial Nomenclature Prior to Linnaeus – use of Phrase Names Linnaeus – each species called by genus name + species epithet = binomial Species – only category that is thought to be discrete, objective

50. Species Names – Binomial Nomenclature Prior to Linnaeus – use of Phrase Names Linnaeus – each species called by genus name + species epithet = binomial Species – only category that is thought to be discrete, objective Species name – consists of genus + species epithet, written in Latin