The potato tuber consists mainly of a mass of cells filled with starch and encircled by a thin corky rind.
The plants generally have a rhizome bearing radical leaves, as in asphodel, rarely a stem with a tuft of leaves as in Aloe, very rarely a tuber (Eriospermum) or bulb (Bowiea).
Various experimenters, especially Fenn, have asserted that by engrafting an eye of one variety into the tuber of another, not only will adhesion take place but the new tubers will present great variety of character; this seems to be the case, but it can hardly be considered as established that the variations in question were the result of any commingling of the essences of the two varieties.
In extreme cases every tuber is lost, as the produce will not even pay the cost of lifting.
Metamorphosis.It has already been pointed out that each kind of member of the body may present a variety of forms. For example, a stem may be a tree-trunk, or a twining stem, or a tendril, or a thorn, or a creeping rhizome, or a tuber; a leaf may be a green foliage-leaf, or a scale protecting a bud, or a tendril, or a pitcher, or a floral leaf, either sepal, petal, stamen or carpel (sporophyll); a root may be a fibrous root, or a swollen tap-root like that of the beet or the turnip. All these various forms are organs discharging some special function, and are examples of what Wolff called modification, and Goethe metamorphosis.
LICHEN (lichen Tuber), in medical terminology, a papular disease of the skin, consisting of an eruption in small thickly set, slightly elevated red points, more or less widely distributed over the body, and accompanied by slight febrile symptoms.
When the tuber of a potato begins to germinate the shoots which it puts out derive their food from the accumulated store of nutritive material which has been laid up in the cells of the tuber.
Many of the fruit-bodies have a pleasant flavour and are eaten under the name of truffles (Tuber brumale and other species).
These become brown, finally blackish and greatly contorted until a large scab is formed on the developing tuber, whence the name by which the disease is known - "black scab."
Introduced by Raleigh in 1610, the cultivation of this important tuber developed with extraordinary Depend- rapidity.
Behind the transverse fissure the lower end of the Spigelian lobe is seen as a knob called the tuber papillare, and from tree right of this a narrow bridge runs forward and to the right to join the Spigelian lobe to the right Vena cava in its fossa lobe and to shut off the transverse fissure from that for the vena cava.
The tuber is a fleshy underground stem, furnished with eyes which are either visible, as in the potato and in some familiar kinds of Tropaeolum (T.
The various sclerotia, if kept moist, give rise to the fructifications of the fungi concerned, much as a potato tuber does to a potato plant, and in the same way the reserve materials are consumed.
An orchis found in the mountain yields the dried tuber which affords the nutritious mucilage called salep; a good deal of this goes to India.
The so-called fir-cone potatoes, which are elongated and provided with scales at more or less regular intervals, show also very clearly that the tuber is only a thickened branch with "eyes" set in regular order, as in an ordinary shoot.
A second edition of the Herbal was published in 1636 by Thomas Johnson, with a different illustration from that given in the first edition, and one which in some respects, as in showing the true nature of the tuber, is superior to the first.
The germinating spores are not only able to pierce the leaves and stems of the potato plant, and so gain an entry to its interior through the epidermis, but they are also able to pierce the skin of the tuber, especially in young examples.
where the plant persists by means of a sympodial rhizome, or in Cyclamen by means of a tuber formed from the swollen hypocotyl.
The first signs of this fungus is the appearance of small white tufts of mycelium bursting through the skin of the tuber, the spores of the fungus being carried at the tips of the threads forming these tufts.
Tuber infection is quickly followed by secondary fungal or bacterial infection known as 'wet rot '.
Tuber Pea (Lathyrus Tuberosus) - A pretty low-growing king, with flowers of a bright dark pink.
The usual plan is to transplant just when the flowers are opening, but at this period of growth the plant is forming a tuber for the following year, and if this is in any way injured it dies.
For example, the fleshy stem (tuber) of the potato plant is nutritious; however, its roots, sprouts, and vines are poisonous.
Their Presence causes the appearance of blackish streaks in the stem and a dark ring some little distance below the surface in the tissues of the tuber.
The fungus, Oedomyces leproides, produces large, blackish, irregular warts which sometimes involve the whole surface of the tuber.
Which blight fungicides can be tank-mixed with Harvest to help protect against tuber blight?
If you are relying on visual examination and find any black scurf at all, a Monceren tuber treatment will be cost-effective.
tuber yield in potato crops.
tuber crops which are easier to cultivate or store.
tuber infection is quickly followed by secondary fungal or bacterial infection known as 'wet rot ' .
The under surface of the left lobe is concave for the interior surface of the stomach (see Alimentary Canal: Stomach Chamber), while a convexity, known as the tuber omentale, fits into the lesser curvature of that organ.
The fungus, Sorosporium scabies, which is the cause of the scab, does not penetrate into the flesh of the tuber, nor detract from its edible properties.
Effects of plastic film covers on dry-matter production and early tuber yield in potato crops.
In some areas yams are being replaced by other tuber crops which are easier to cultivate or store.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.