1. TROPICAL FRUITS AND NUTS

2. David S. Seigler Department of Plant Biology University of Illinois Urbana, Illinois USA

3. Tropical Fruits and Nuts: Outline
Importance
Local
World-wide
Botanical
Domestication
Changes -some ancient
Cultivation - propagation - rarely monoculture - why not?

4. Most Important
Bananas
Citrus
Pineapple
Avocado
Mango
Tropical nuts- importance
Coconut
Cashew

5. READING
CHAPTER 4 IN TEXT.

6. Fruits from market in Panama
Courtesy Dr. Carol Augspurger

7. Tropical fruits in a Queensland market

8. Introduction
Many types of tropical fruits. Some exotic and not found commonly in temperate regions of the world.
Others are well-known cultivars such as tomatoes, squash, green peppers and cucumbers.
Most of the other types of tropical crops are perennials that cannot be cultivated in temperate zones of the world.

9. More types of fruits in the tropics than in temperate portions of the world
Few previously known here. The situation has changed in recent years. Many exotic tropical fruits are "in".
In the tropics, most gathered wild or cultivated on a local scale and consumed locally.

10. Bananas, citrus crops, pineapples, mangoes, and avocados are major exceptions.
See the table of tropical fruits and nuts on pg. 76.
Tables of production, p. 77.

11. Bananas
Bananas (Musa sp., Musaceae) are from southeast Asia. The taxonomy is complex. They were early taken to Madagascar and Africa by the Indonesians. In 600 B.C. they were in India. Alexander the Great saw them there. In 1522 in West Africa. To the Americas by 1516.
Other evidence indicates that bananas were also domesticated in east Africa at an early date.

12. Banana plantations in Jamaica

13. Musa sapientum, bananas, Musaceae
Carolina Biological Supply Co.

14. Banana leaves and plantains

15. Most banana species have seeds.
Common cultivars are sterile triploids.
Most bananas in the tropics cooked, but many also are eaten fresh.
Most of bananas in the U.S. are the latter type.

16. Primitive, probably diploid, banana
Balick and Cox, Plants, People, and Culture

17. The rise of bananas as a cultivated crop is linked to the history of the United Fruit Company.
In 1900, the company developed a good transport system to ship bananas to market.
They perfected the conditions to ship the fruits without spoilage and to ripen them at exactly the proper time for market.
They also dominated the politics of many Central American countries.

18. Bananas reproduced vegetatively
Bananas reproduced vegetatively. This leads to many fungal disease problems.
See figures pg. 94.
Musa textilis (abaca) is used as a fiber crop.

19. Citrus crops
Domesticated members of this genus are difficult taxonomically because of selection of mutants and hybridization in agricultural practice.
All have a hesperidium for a fruit. This is basically a berry with a leathery skin (exocarp and mesocarp together) and oil glands.
The endocarp has modified fleshy hairs or juice sacs that are the part we eat.

20. Citrus fruits
The Complete Book of Fruits & Vegetables, F. Bianchini, F. Corbetta, M. Pistola, Crown Publishers, New York, 1973

21. Citrus fruit keeps relatively well
Citrus fruit keeps relatively well. None of this group is native to the low, wet tropical regions of the world.
They seem to prefer dry climates with lots of sunshine.
They cannot tolerate severe frosts well.
The citron (Citrus medica) was the first introduced into Europe.

22. Almost all are propagated vegetatively
Almost all are propagated vegetatively. The orange (Citrus sinensis, Rutaceae) is the most widely cultivated of all of the Citrus crops.
The wild ancestors are not known.
Oranges transferred to the Persian empire. The Moors brought them to Spain. The Spanish and Portuguese introduced them into the New World.
Most U.S. oranges from Florida, Texas and California.
Diagram of orange flowers etc. p. 79.

23. Citrus aurantium or bitter orange used for marmalade and liquors.
Citrus aurantifolia, the lime, from East Indies. The Arabs used them by 1000 A.D. They were introduced into Europe by 12th or 13th century. Used to treat scurvy by the British.
Citrus reticulata, the tangerine was brought to the U.S. and to Europe about From S.E. Asia.

24. Pomello, Citrus grandis, Rutaceae

25. Citrus paradisi, the grapefruit, arose spontaneously in the West Indies. Considered to be a hybrid between the pummelo (C. maxima) and the sweet orange (C. sinensis) by some.
Pink grapefruit (e.g., Ruby Red) are "sports" or somatic mutations.
Ruby Red arose in McAllen, Texas, in 1929 and is propagated vegetatively.

26. Grapefruit, Citrus paradisi, Rutaceae

27. Lemon, Citrus limon, Rutaceae
Citrus limon often associated with Italian descent peoples. Lemons often used for flavoring foods.
Lemon, Citrus limon, Rutaceae

28. Pineapple, Ananas comosus, Bromeliaceae
Widely distributed in the New World when Columbus came.
Pineapples domesticated by the Guaraní Indians of Paraguay.
Pineapples are multiple fruits.
Most modern cultivars parthenocarpic. They set seed without fertilization.
Normally, pineapples are reproduced vegetatively.

29. Pineapple, Ananas comosus, Bromeliaceae

30. Pineapples were taken to many countries by the Portuguese, Spanish, and Dutch.
They were taken to Hawaii by the Dole family.
In the 1970s, Hawaii grew about 1/3 of world's supply. Now about 2%.

31. Avocados (Persea americana, Lauraceae)
Avocados native to Mexico and Central America. Exceptional in that they have lipids instead of sugars or starches. The mesocarp is rich in oil calories per kg.
Avocados appear about 7000 B.C. in Mexico. May have been independently domesticated in at least three different areas.
Introduced into the U.S. by the Spanish, but did not become common until the 1960s.
Today, many are cultivated in Florida and California.

32. Avocados and flowers

33. Avocados, Persea americana, Lauraceae

34. Primitive avocados

35. Mangoes (Mangifera indica, Anacardiaceae)
Mangoes are native to southeast India.
Mangoes taken to the New World by the Portuguese and are now a major crop in many countries.
See pg. 98.
Some people are sensitive to the outside of the fruit.

36. Mangos, Mangifera indica, Anacardiaceae

37. Dates, Phoenix dactylifera, Arecaceae
Dates come from the palm family (Arecaceae or Palmae).
Dates have long been an important food plant. Fruits of wild relatives have been gathered for thousands of years and presumably the cultivated ones arose from these.
Dates are nutritious and contain 75% carbohydrate and 2 percent protein.
Date palms are dioecious, i.e., they have male and female parts on different plants.
By 2300 B.C., agriculturalists had learned how to pollinate them.

38. Collecting pollen and pollinating date palms
Courtesy Dr. Abraham Krikorian

39. Figs (Ficus carica, Moraceae)
Figs are from the Near East. They have been cultivated for thousands of years.
This large genus contains only one important commercial fruit crop.
The fig is frequently mentioned in the Bible and other Near Eastern literature.
Figs are often pollinated by small wasps, although some are parthenocarpic or self-pollinating.
Smyrna figs have only female flowers. Smyrna and Capri figs often grown together to provide pollen source.
See diagram p. 96.

40. Fig, Ficus carica, Moraceae

41. Figs in market

42. A synconium

43. Breadfruit and jackfruit
Breadfruit (Artocarpus atilis, Moraceae) native to Polynesia. Cultivated for thousands of years.
Tall trees with unisexual flowers. Forms a multiple fruit. The part eaten is formed by abortive flowers. See p. 101.
Captain Bligh sent to take them to the West Indies to feed slaves. He set out in the ship Bounty but encountered difficulties. Bligh persevered and went back and finally got breadfruit to the West Indies.
Jackfruit (Artocarpus heterophyllus) has a similar fruit but sweet tasting.

44. Breadfruit, Artocarpus atilis, Moraceae

45. Jack fruit, Artocarpus heterophyllus, Moraceae

46. Pomegranates (Punica granatum, Punicaceae)
Pomegranates native to the Old World.
Also cultivated for thousands of years.
Brought to Spain by the Moors by 800 A.D.
Spanish introduced pomegranates into the New World.
Grown for both ornamentals and fruits.

47. Pomegranate, Punica granatum, Punicaceae

49. The papaya (Carica papaya, Caricaceae)
Papayas are native to Central America or northern South America, but now are cultivated throughout the tropics.
They are in demand in the U.S. mostly for the enzyme papain isolated from the immature fruits.
See p. 100.

50. Papaya, Carica papaya, Caricaceae
Courtesy Dr. Mark McClure

51. More exotic tropical fruits
Members of the genus Annona such as the sweet sop and the cherimoya.
Courtesy Dr. Nancy Hikes

52. Soursop or guanábana, Annona muricata, Annonaceae
They are compound fruits.

53. Star fruit or carambola (Averrhoa carambola, Oxalidaceae) is native to Asia.

54. Kiwi fruit (Actinidia chinensis, Actinidiaceae) are native to Asia
Kiwi fruit (Actinidia chinensis, Actinidiaceae) are native to Asia. They were introduced from New Zealand.

55. Passion fruit (Passiflora edulis, Passifloraceae) native to New World are widely eaten. See p. 103.

56. Guavas (Psidium guayaba, Myrtaceae) (native to S
Guavas (Psidium guayaba, Myrtaceae) (native to S. America) Several other members of this family are also eaten.

57. Hog plum or ciruela, Spondias purpurea, Anacardiaceae

58. Sapotes and sapodillas (most from the Sapotaceae)
Sapotes and sapodillas (most from the Sapotaceae). Mamey colorado, Calocarpum mammosum, Sapotaceae

59. Amecameca market with mameys

60. The akee (Blighia sapida, Sapindaceae) was introduced from Africa to the West Indies with black slaves. The national dish of Jamaica. A number of toxicity problems are associated with this fruit.

61. Lychee, Litchi chinensis, Sapindaceae
The litchi (Litchi chinensis) and the rambutan (Nephelium lappaceum) are members of the Sapindaceae. Both native to Asia.

62. Rambutan, Nephelium lappaceum, Sapindaceae

63. The "mamon tico" or mamoncillo (Melicocca bijuga) is native to Central and South America. Also Sapindaceae.
The mangosteen (Garcinia mangostana, Clusiaceae) is native to Southeast Asia. Although really delicious, it is rarely seen outside of that part of the world.

64. Mangosteen, Garcinia mangostana, Clusiaceae

65. The durian, Durio zebethinus, Bombacaceae, is legendary for its odor
The durian, Durio zebethinus, Bombacaceae, is legendary for its odor. This fruit, native to Southeast Asia, has a creamy texture and is quite sweet in taste.

66. Tropical nut crops
Many nuts have been utilized and some domesticated in the tropics as well as in the temperate portions of the world:

67. The coconut (Cocos nucifera, Arecaceae)
Coconuts widely used in the tropics today.
Yield oil, fiber, drink, and food.
Coconut native to S.E. Asia and early transported to many parts of the world by ocean currents and also by man. The coconut had apparently just arrived in the New World before Columbus.
Each fruit contains one seed. This is one of the largest seeds known.

68. Coconut, Cocos nucifera, Arecaceae

70. Coconut plantation in northern Venezuela

71. Cashew (Anacardium occidentale, Anacardiaceae)
The cashew is the most important tropical fruit that is eaten as a nut.
This fruit is poisonous until heated and the outside portions removed.
See diagrams pg. 105.
Cashews are native to northern South America.

72. Cashew, Anacardium occidentale, Anacardiaceae
Natural History Magazine

73. The "fruit" is also eaten as a fruit, but usually used for making juice.
Now widely escaped and cultivated in arid tropical regions such as India, southern Africa, Mexico, Florida, and the Mediterranean.
India is a major producer.

74. Cashew and consumers
Natural History Magazine

75. Macadamia (Macadamia integrifolia, Proteaceae)
Macadamia nuts are one of few plants from Australia that are cultivated.
They were taken from Australia to Hawaii where most macadamia cultivation is centered.
The climate there is ideal and Hawaii is one of the few places that they can be grown well.

76. Macadamia, Macadamia ternifolia, Proteaceae

77. Brazil nuts (Bertholletia excelsa, Lecythidaceae)
Brazil nuts are native to Brazil. They are borne in a peculiar fashion, see the diagram pg. 106.
Brazil nuts usually collected from wild trees.
They are 66% fat.
Brazil nut oil is used as an edible oil in Brazil.
A major Brazilian export.

78. Brazil nut, Bertholettia excelsa, Lecythidaceae
National Geographic
Courtesy Dr. Carl Bouton