Glandular Tissues

Glandular Tissues

 

of plants (plant glandules), formations that perform the function of secreting drops of water or other substances.

There are several groups of glandules, including hydathodes, nectaries, and digestive, oily, resinous, mucous, and gum glandules. In insect-eating plants, the digestive glandules secrete digestive juices. Oily, resinous, mucous, and gum glandules secrete resins, essential oils, and other substances. They may be external or internal. External glandules are common in the bud scales (for example, of poplars or birches), leaves, and stems of many plants (of the family Labiatae and others); these glandules are a type of hair (sometimes called glandular hairs, for example in primroses and dead nettles). Internal glandules most often consist of tightly joined, mainly squamous, epithelial cells surrounding a cavity (intercellular space), into which they discharge the resins, essential oils, and other substances they have secreted. They are often visible (for example, in the leaves of citrus or St. John’s wort) as light, translucent spots. In a number of cases they are long (most often in the stems and roots) and tubular, and for the most part they are connected to one another. Sometimes internal glandules are single cells or groups of cells in which the substances they have elaborated accumulate (most often essential oils). The secretions of glandular tissues may have practical application (for example, oleoresin and essential oils). Some of them are poisonous.

References in periodicals archive ?
As breast development continues the fibrofatty and glandular tissues increase.
The disease causes tenderness in the mammary glands and producing physical, chemical and bacteriological changes in milk and pathological changes in the glandular tissues [2, 3].
2) Possible origins of adenocarcinomas of the external auditory meatus in people include ceruminous or sebaceous glands, direct invasion from the parotid gland, or distant metastasis from other glandular tissues.
Mastitis is inflammation of mammary gland and udder tissue causing changes in glandular tissues affecting quality and quantity of milk.
Mucins are complex carbohydrate secreted by different types of epithelial cells and glandular tissues of alimentary tract.
Strategies for bioengineering the development and metabolism of glandular tissues in plants.
After parenchymal dissection from the pectoral fascia, the glandular tissues were approximated by sutures, and closure was performed without separating the skin from underneath glandular tissue so there is no danger of irradiating thin skin flaps.
However, iodine has many other uses in the body, including maintaining the normal architecture of all the glandular tissues including the breast, ovary, and uterus.
To validate the performance of the proposed method, we set four different sizes of circle areas, which represent the glandular tissues, embedded in the fat.
The seven-time Grand Slam winner was diagnosed with Sjogren syndrome, the disease that affects glandular tissues - most notably the tear and saliva glands.
Benign alterations and malignant tumours originating from glandular tissues (e.
The glandular tissues used for investigations were not affected by the underlying disorders.