Yam plants have thick tubers (generally a development of the base of the stem) which often have thick, almost barklike skin. The long, slender, annual, climbing stems bear lobed or entire leaves that are either alternate or opposite. The unisexual flowers are borne in long clusters.

How many is a tuber of yam?

In commonly cultivated yams, the tubers lie underground and are one (rarely two or three) per plant. These tubers resemble huge, elongated potatoes, typically growing 2-6 ft long (0.6-2 m) and weighing 11-33 lb (5-15 kg).

What are examples of tubers?

Common examples edible of tubers include potatoes, jicama, sunchokes, and yams. Root tubers (like sweet potatoes or cassava) are often mistakenly classified within this category, but because they have swollen roots (rather than stems) they don’t fit the technical bill for what a true tuber is.

Do yams have tubers?

Yams are members of the genus Dioscorea and are in their own special family, Dioscoreaceae. They are tubers, like potatoes, and are mostly cultivated in tropical parts of the world. A number of different yam species are grown for food, and the large tubers range in color from white to yellow, pink, or purple!

What is the tuber of a sweet potato?

Unlike regular potatoes, which are tubers, sweet potatoes are considered to be root vegetables. The root, however, is described as a tuberous root. Both sweet and regular potatoes grow under the soil, but they are very different when it comes to density, taste and nutrition.

How much is a tuber of yam in Nigeria?

A market survey by the News Agency of Nigeria (NAN) on Wednesday in Abuja confirmed this information. A set of yam which consists of five tubers is sold for N5,500 or N6,000 depending on the size of the tuber. The same set of yam was sold before now between N3,000 and N4,000.

What is the maturity period of yam?

In West and Central Africa tubers are planted between February and April, depending on whether in humid forest or on the savanna, and are harvested 180 to 270 days later. Care is needed during harvesting to minimize damage to tubers that lead to rot and a decrease in market value.

Is yam a stem or root tuber?

Potatoes and yams technically have modified belowground stems (“stem tubers”) while sweet potatoes have “root tubers.” monocots (related to grasses and lilies). … Yams can be stored for very long periods of time, making them an important crop for seasons when food is in short supply.

What is the scientific name for yam?

Yam is the name given to several plant species in the genus Dioscorea including Dioscorea alata (white yam), Dioscorea bulbifera (potato yam), Dioscorea cayenensis (yellow yam), Dioscorea esculenta (Asiatic yam) and Dioscorea batatas (Chinese yam) that are grown for their edible tubers.

What is the use of yam?

Yams are consumed as cooked starchy vegetables. They are often boiled and then mashed into a sticky paste or dough, but they may also be fried, roasted, or baked in the manner of potatoes or sweet potatoes, which are unrelated. Men and boys carrying yams at a harvest festival in the Trobriand Islands, Papua New Guinea.

Article first time published on

Why is yam a stem tuber?

Stem tubers form thickened rhizomes (underground stems) or stolons (horizontal connections between organisms); well known species with stem tubers include the potato and yam. Some writers also treat modified lateral roots (root tubers) under the definition; these are found in sweet potatoes, cassava, and dahlias.

What is tuber give two examples?

Vegetables which grow underground on the root of a plant. Tubers are usually high in starch. Examples are kūmara, potatoes, (storage root), yam, taro, Jerusalem artichoke and ulluco.

What are examples of rhizomes?

Rhizomes are simply fleshy underground stems. They grow underground or right at ground level with many growing points or eyes similar to potatoes. Common examples of rhizomes include canna lilies, bearded Iris, ginger and bamboo.

What is the difference between a sweet potato and yam?

In the United States, the terms “yam” and “sweet potato” are used interchangeably, but they are completely different vegetables. Yams are starchy and have a rough, brown exterior. … Sweet potatoes are a New World root vegetable, have a softer, reddish skin, a creamier interior, and often, a darker interior.

What is the difference between a tuber and a root?

Root crops have modified roots to function as storage organs, while tuber crops have modified stems or roots to function as both storage and propagation organs. As such, the modified roots of root crops cannot propagate new crops, whereas the modified stem or roots of tuber crops can propagate new crops.

What is a yam potato?

Orange Sweet Potato – Orange sweet potatoes are commonly labeled as yams. This variety is also called the soft sweet potato and has reddish-brown skin with bright, orange flesh. Popular varieties of soft sweet potatoes are the Jewel Yam and Garnet Yam.

What are the diseases of yam?

The field and storage diseases are presented, anthracnose is regarded as the most widely spread of all the field diseases, while yam mosaic virus disease is considered to cause the most severe losses in yams. Dry rot is considered as the most devastating of all the storage diseases of yam.

How can I increase my yam yield?

Some approaches to producing quality seed of yam are as follows: farmers select small whole tubers from a ware crop harvest; stimulate the production of seed tubers by ‘milking’ ware tubers while the leaves of the plant are still green (double harvest system); cut ware tubers into setts about the same sizes as regular …

Which state is the highest producer of yam in Nigeria?

Taraba is the top region by production of yam in Nigeria. As of 2005, production of yam in Taraba was 3,162 1000 metric tons that accounts for 12.89% of Nigeria’s production of yam.

How much is a bag of garri in Nigeria 2020?

Across different markets in Nigeria like in Lagos, Enugu, Aba, Delta, Benin, Ibadan, Ogun, Abuja, Port-hacourt, Imo, Benue and other states, Garri sells for different prices in these various states but the average price of Garri is ₦400 per kg, ₦1,000 per paint and ₦39,000 per 100 kg bag in Nigeria.

Where can I buy cheap yam in Nigeria?

Yes yam is cheap in Taraba but you have to buy in bulk and not few because you will spend more money to transport them down. Nasarawa State is another best place to source for yam, they have Agyeragu market and yam store in Lafia. In Abuja, Bwari market is a good place to buy yam at a very cheap price.

Which part of yam is edible?

Yams are cultivated for the consumption of their starchy tubers in many temperate and tropical world regions. The tubers themselves are also called “yams”, having numerous cultivars and related species.

What is economic importance of yam tuber?

Without yam in the market, millions of African families may starve. your hips and waistline. Yams are also a good source of manganese, a trace mineral that helps with carbohydrate metabolism and is a co factor in a number of enzymes important in energy production and antioxidant defenses.

What is tuber in plant?

tuber, specialized storage stem of certain seed plants. Tubers are usually short and thickened and typically grow below the soil. … As modified stems, most tubers bear minute scale leaves, each with a bud that has the potential for developing into a new plant.

What is a rhizome in plants?

rhizome, also called creeping rootstalk, horizontal underground plant stem capable of producing the shoot and root systems of a new plant. … In plants such as water lilies and many ferns, the rhizome is the only stem of the plant.

How do tubers work?

Tubers, such as potatoes, are fleshy underground storage structures composed of enlarged parts of the stem. A tuber functions in asexual propagation as a result of the tiny scale leaves equipped with buds that grow on its surface. Each of these buds can form a new plant, genetically identical to the parent.

Is yam good for fertility?

Yes, yams. Apparently it contains phytoestrogen, an estrogen compound that increases a woman’s Follicle Stimulating Hormone (FSH), and may induce a higher rate of ovulation.

Is yam good for pregnancy?

Good to Eat When Pregnant: Sweet Potato Sweet potatoes are high in beta carotene, a compound vital for healthy fetal development. Likewise, they contain plenty of fiber, which is known to improve digestive health and reduce blood sugar spikes.

Does yam increase blood sugar?

Its high fibre content contributes to a glycemic index of 54, significantly lower than that of potatoes having a glycemic index of 80. This makes yam better suited for weight watchers, diabetics and those with heart disease as it does not create sharp increase in insulin response.

What is the difference between root tuber and stem tuber?

The main difference between stem tuber and root tuber is that the stem tuber is a swollen stem whereas the root tuber is a swollen root. For example, potatoes are stem tubers while dahlias are root tubers.

What is the difference between a tuber and a tuberous root?

Tubers are modified shoots, whereas tuberous roots are modified roots. The common feature, and hence the similar names, derives from the fleshy nature of both organs. Tubers and tuberous roots function in water and food storage, but only tubers are involved in vegetative…