吐水(guttation) 从未受伤的叶片尖端或边缘的水孔向外溢出液滴的现象。 吐水也是由 根压 引起的。 作物生长健壮，根系活动较强，吐水量也较多，所以，吐水现象可以作为根系生理活动的指标，并能用以判断苗长势的好坏。

Guttation is the phenomenon of water loss in the form of liquid from the edges, surface, or tips of uninjured leaves ( compare with transpiration , where water loss occurs in the form of vapours from the leaves) in a wide range of plant species including angiosperms, gymnosperms, algae, …

Guttation happens when there is excessive water in the soil and there is an absence of water loss through transpiration. Guttation is likely to occur during the night, hence the guttation droplets are seen in the mornings.

Guttation is the exudation of drops of xylem and phloem sap on the tips or edges of leaves of some vascular plants, such as grasses, and also a number of fungi. Ancient Latin gutta means "a drop of fluid", whence modern botany formed the word guttation to designate that a plant exudes drops of fluid onto the outer surface of the plant, when the ...

On evaporation, the solutes that remain at the margins or tips of leaves cause salt burning, which is often called “ guttation burn.” The liquid drops that are exuded from the leaves always pass out through hydathodes and as such may have physiological implications in plants (Heringa, 1971).

2014年1月1日 · On evaporation, the solutes that remain at the margins or tips of leaves cause salt burning, which is often called “guttation burn.” The liquid drops that are exuded from the leaves always pass out through hydathodes and as such may have physiological implications in plants ( Heringa, 1971 ).

2016年5月13日 · In view of complicated nature of guttation, the interplay of phytohormones produced in the roots and shoots in long-distance signaling evidenced by variations in xylem sap cytokinin concentrations, shoot auxin level, auxin transport and auxin response seem to be operative for induction of natural guttation (Aloni, 2001; Aloni et al., 2005 ...

2020年5月12日 · In leaves, fluid excretion, that is, guttation, serves varied purposes and is mediated by hydathodes, that is, mouths without lips. The importance of guttation for plants can be identified by the fact that it might serve as a pressure-release valve in precipitation and continuous absorption of water, with resultant progressive development of ...

2024年2月1日 · The daily and seasonal occurrence of plant guttation varies significantly, as shown for highbush blueberries, which had increased amounts of guttation during active shoot growth and expansion and early fruit development [15].

2013年1月1日 · Guttation is the process of liquid exudation from hydathodes situated on the tip, along the margins and adaxial and abaxial surfaces of leaves. Hydathodes, also known as water stomata or water pores, unlike stomata, are always open representing the path of least resistance to the liquid outflow from them.