Guttation

enUK

guttation

[‚gə′tā·shən] (botany) The discharge of water from a plant surface, especially from a hydathode.

Guttation

the exudation of water droplets by plant leaves, occurring when more water is absorbed by the roots than is evaporated by the leaves. It is observed mainly at night, in the early morning, or when plants are placed in a humid atmosphere; it is often observed in young sprouts, such as those of grains, whose root-system development overtakes the development of the evaporative surfaces of their leaves. The drops of water are secreted through water stomata under the action of root pressure, by the force of water pressing into the stems and leaves. Guttation is a physiological process connected with the life processes of the plant; if wheat sprouts are placed under a cone inside of which there is chloroform vapor, guttation ceases. Secretions of guttation always contain a number of mineral substances. Evidently guttation rids the plant of excess salts, mainly calcium.

guttation

Fig. 184 Guttation . Transverse section of a saxifrage leaf.

guttation

the emergence of water from the endings of leaf veins, usually occurring at night when TRANSPIRATION is low or absent. Guttation is thus a method of exuding excess water and involves special water pores called HYDATHODES at leaf tips which, unlike normal STOMATA, are not able to control their aperture size. The process is common in low-growing plants such as grasses.

单词	guttation
释义	guttation enUK gut·ta·tion G0322800 (gŭ-tā′shən)n. The exudation of water from leaves as a result of root pressure. gut•ta•tion (gʌˈteɪ ʃən) n. a process in which water in liquid form is given off by plants. [1885–90; < German; see gutta, -ation] Guttation enUK guttation [‚gə′tā·shən] (botany) The discharge of water from a plant surface, especially from a hydathode. Guttation the exudation of water droplets by plant leaves, occurring when more water is absorbed by the roots than is evaporated by the leaves. It is observed mainly at night, in the early morning, or when plants are placed in a humid atmosphere; it is often observed in young sprouts, such as those of grains, whose root-system development overtakes the development of the evaporative surfaces of their leaves. The drops of water are secreted through water stomata under the action of root pressure, by the force of water pressing into the stems and leaves. Guttation is a physiological process connected with the life processes of the plant; if wheat sprouts are placed under a cone inside of which there is chloroform vapor, guttation ceases. Secretions of guttation always contain a number of mineral substances. Evidently guttation rids the plant of excess salts, mainly calcium. guttation enUK Fig. 184 Guttation . Transverse section of a saxifrage leaf. guttation the emergence of water from the endings of leaf veins, usually occurring at night when TRANSPIRATION is low or absent. Guttation is thus a method of exuding excess water and involves special water pores called HYDATHODES at leaf tips which, unlike normal STOMATA, are not able to control their aperture size. The process is common in low-growing plants such as grasses.
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guttation

gut·ta·tion

gut•ta•tion

Guttation

guttation

Guttation

guttation

guttation