Cladophyll


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

cladophyll

[′klad·ə‚fil]
(botany)
A branch arising from the axil of a true leaf and resembling a foliage leaf. Also known as cladode.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cladophyll

 

(also cladode), the modified shoot of plants with a flattened foliaceous stem, which performs the functions of a leaf. The leaves of a cladophyll are severely reduced, forming thorns or falling off early. The cauline nature of a cladophyll is indicated by its position in the axil, which is usually squamose, and by the formation of flowers, which never occurs on true leaves.Cladophylls characterize plants in drought areas and are considered adaptations for decreasing evaporation (their smaller surface and vertical position). They form in various plants, including asparagus and smilax. Sometimes cladophylls that stop growing early and resemble leaves are called phylloclades—for example, Ruscus and Phyllocactus.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In temperate conditions, photosynthetic activity in asparagus is maintained for approximately 4 mo from late spring to late summer and then all cladophyll tissue senesces within a few weeks in the fall.
Both cultivars showed a significant decline in A in senescent cladophyll tissue in April, although most of the senescing cladophylls retained their chlorophyll content.
In the present study, both cultivars had significantly lower net photosynthesis rates in the senescent cladophyll measured in April in comparison with the mature cladophyll measured in March.
Apart from the physiological differences, differences in cladophyll properties are also likely to play a significant role in determining the rate of photosynthesis in the two cultivars.
Each measurement was made by enclosing about 20 to 30 cladophylls in a clear-topped cuvette to make the total photosynthetic area approximately 4 [cm.sup.2].
Chlorophyll fluorescence of cladophylls measured with a portable fluorometer (Mini-PAM-2000, Walz, Germany) was used to assess the photochemical efficiency of photosystem II (PSII).
Freeze-dried cladophylls were used for soluble sugar and starch determination by a phenol-sulfuric acid method (Tissue and Wright, 1995).
The response of photosynthesis to [C.sub.i] in fully expanded and mature cladophylls differed between cultivars, with significant cultivar difference in values of [V.sub.cmax] and [A.sub.sat] observed.