Lecture 28 Other Tropical Starch Crops

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Lecture 28Other Tropical Starch Crops
Sweet potato Ipomoea batatas, Convolvulaceae
New World Origin, has become naturalized in the
Pacific. One theory is that it was carried by Pol
ynesian travelers from Easter Island, but more
likely it came from the Philippines where it was
introduced by the Spanish conquistadors.
Adapted to tropical lowlands and an important
food in Asia. In tropics most cultivars are white
fleshed. Has now has become an important tempera
te crop.
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Sweet Potato 2001 World Production
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Morphology of the sweetpotato plant.
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Potato Solanum tuberosum, Solanaceae
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Also known incorrectly as Irish potato (but is
not from Ireland) and white potato (but there are
yellow and red types). A tropical highland crop
but now the most important temperate tuber
vegetable. Still grown in tropical highlands. Cr
op is very sensitive to daylength.
S. tuberosum (4x, a tetraploid) tubers in short
days and long days a long day selection of S.
andiginum) S. andiginum (4x) tubers only in sho
rt days S. demissum (6x) small and colorful pot
atoes of Peru S. phureja (2x) S. stenotomum (2
x)
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Potato 2001 World Production
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Plant and flowers of potato.
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The potato tuber is an underground stem.The eyes
are buds.
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Potato blight
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Minor Peruvian Root Crops Inca crops in a market
in Ipiales, Colombia
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Collection of Peruvian Root Crops
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Ulluco Ullucus tuberosus
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Oca, Oxalis tuberosus
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Palms and Cycads
The stems of Cycads and Palms are a source of
carbohydrates inside the stem.
They are harvested by cutting down the tree and
scraping the stem. Sago Metroxylon sagu, Palmace
ae An enormous palm, originated in Malaysia. Gro
ws 10 to 15 years before it flowers, during this
period it accumulates starch. It is not widesprea
d but found now in New Guinea.
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Cycad cone
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Cycads
Male
Female
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