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(单词翻译:双击或拖选)
By Cathy Majtenyi
Nairobi
31 May 2006
Members of a community group in Kwale District on Kenya's coast show off some of the many local dishes that can be made with the beta-carotene-rich sweet potato
The orange-fleshed sweet potato is rich in beta-carotene and helps to eliminate Vitamin A deficiencies in children and adults, a major health concern in Africa. While widely available in the West, this type of potato is not as common in Africa. During the past year, researchers from Kenya and other countries have introduced a new, bio-fortified1 type of orange-fleshed sweet potato as a way of reducing Vitamin-A deficiencies.
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It is orange-fleshed sweet potato day at Lukore Primary School in the Shimba Hills of Kenya's coastal2 district of Kwale.
A visiting delegation3 of researchers, government officials and journalists is being treated to a variety of entertainment, all celebrating the virtues4 of the humble5 orange-fleshed sweet potato, which is among the highest natural sources of beta-carotene, a precursor6 to Vitamin A.
Jackson Nzivo Mwaniki, a teacher at Lukore Primary School, stands in front of a plot where he and students grow sweet potatoes
In the school's compound is a small plot with rows and rows of orange-fleshed sweet potato plants. Teacher Jackson Nzivo Mwaniki explains that he and the students plant orange sweet potatoes and distribute the vines to parents and other homesteads in the area.
Mwaniki says that his school was chosen last year mainly because of the school uniform that the students wear, and that local residents are happy with the orange sweet potato.
"The shorts and skirts are green, while the shirts are orange," he said. "That is why it [the school] was given first priority. When they chose us, they saw even the area itself, it is a potato-growing area. When it was introduced to this area, they welcomed it very highly. The children were very happy about it, and they even started planting [the sweet potato vines] in their homes."
Lukore Primary School is one of several demonstration7 sites that researchers have chosen in the district to educate residents about the nutritional8 value of the orange-fleshed sweet potato and encourage them to include the food in their diets.
According to the World Health Organization, children who suffer from vitamin-A deficiency suffer a dramatically increased risk of death and illness as a consequence. In communities where the deficiency exists, improving vitamin-A status can, on average, reduce young child mortality by 23 percent and measles9 mortality by 50 percent.
Students at Lukore Primary School in Kwale perform dances, skits10, poems, and even rap songs to pay homage11 to the sweet potato
About 45 schools in the Kwale district grow and distribute the vines to households. Roughly 40 percent of households in the district grow the orange-fleshed sweet potato.
Sammy Agili is a sweet potato breeder with the Nairobi office of the International Potato Center. He says that last year his center and the Kenya Agricultural Research Institute introduced eight varieties of orange-fleshed sweet potatoes into Kwale District.
Up until then, people grew and ate predominantly white-fleshed sweet potatoes.
Agili explains that scientists are able to breed into the sweet potato varieties different levels of beta-carotene, sugar, and what is known as dry matter content (DM), which determines how moist or dry the sweet potato is.
"Consumers have different likes," he said. "For example, the children would like those varieties that are low DM and high sugar content. Now when you look at the mothers, their preference is quite different from men also. Men would like those varieties that have high DM, but slightly low sugar content. So we had a range of varieties which we introduced to them to select."
Agili says Kwale District has one of the highest malnutrition12 and Vitamin-A deficiency rates in Kenya, and that by introducing the different varieties of the orange-fleshed sweet potato, scientists are hoping to improve the area's nutritional situation.
One of several posters at Lukore Primary School that pays homage to the sweet potato
Young children and pregnant and lactating women are most affected13 by Vitamin-A deficiency, which weakens the immune system and increases the chances of getting measles, malaria14, diarrhea and eye conditions. About 70 percent of pre-school children in Kenya are believed to be Vitamin-A deficient15, one of the highest rates in Sub-Saharan Africa.
Scientists are able to breed desirable nutritious16 characteristics into the orange-fleshed sweet potato through a process called "bio-fortification".
Bonnie McClafferty is communications coordinator17 for Harvest Plus, an U.S.-based international research program that aims to decrease malnutrition by increasing the levels of vitamins and minerals in crops.
McClafferty explains that most poor people cannot afford to purchase a large variety of foods that may contain different vitamins and minerals, nor buy vitamin supplements, nor purchase food that is commercially fortified such as iodized salt.
"The concept of bio-fortification is that you use the powers of modern agricultural plant breeding to breed nutrition directly into the staple18 foods that poor people eat," she said. "The reason why this is important is that the predominant food of the undernourished are staple foods, up to 70 percent of the diet consists of either wheat or maize19 or cassava or beans, yet there is not a lot of micronutrients in those staple foods."
The International Potato Center's Agili says researchers will need to do follow-up studies in a year or two to see the impact of the orange-fleshed sweet potato on Kwale District's nutritional situation.
1 fortified | |
adj. 加强的 | |
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2 coastal | |
adj.海岸的,沿海的,沿岸的 | |
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3 delegation | |
n.代表团;派遣 | |
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4 virtues | |
美德( virtue的名词复数 ); 德行; 优点; 长处 | |
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5 humble | |
adj.谦卑的,恭顺的;地位低下的;v.降低,贬低 | |
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6 precursor | |
n.先驱者;前辈;前任;预兆;先兆 | |
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7 demonstration | |
n.表明,示范,论证,示威 | |
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8 nutritional | |
adj.营养的,滋养的 | |
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9 measles | |
n.麻疹,风疹,包虫病,痧子 | |
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10 skits | |
n.讽刺文( skit的名词复数 );小喜剧;若干;一群 | |
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11 homage | |
n.尊敬,敬意,崇敬 | |
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12 malnutrition | |
n.营养不良 | |
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13 affected | |
adj.不自然的,假装的 | |
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14 malaria | |
n.疟疾 | |
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15 deficient | |
adj.不足的,不充份的,有缺陷的 | |
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16 nutritious | |
adj.有营养的,营养价值高的 | |
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17 coordinator | |
n.协调人 | |
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18 staple | |
n.主要产物,常用品,主要要素,原料,订书钉,钩环;adj.主要的,重要的;vt.分类 | |
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19 maize | |
n.玉米 | |
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