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A form of macrocytic anemia in young females characterized by marked reduction in hemoglobin and a greenish skin color.
(plant pathology)
A disease condition of green plants seen as yellowing of green parts of the plant.
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 It might be outdated or ideologically biased.



a plant disease in which the formation of chlorophyll in the leaves is disrupted and photosynthetic activity is decreased. Characteristic symptoms are premature yellowing and falling of leaves, formation of dwarf leaves, desiccation of shoot apices, and dying off of active roots. Among cultivated plants, fruit and berry crops and ornamentals are most often affected.

The causes of chlorosis are varied. Infectious chlorosis is caused by viruses (for example, raspberry chlorosis and apical chlorosis of tobacco and makhorka), fungi, and other microorganisms. Pests, such as thrips and aphids, are often the carriers of the causative agents of chlorosis. Noninfectious, or functional, chlorosis develops because of unfavorable soil or climatic conditions or because of inadequacy of cultivation practices. In most cases, fruit and berry crops (especially grapes) on carbonate soils suffer from ferrous or calcareous chlorosis. Zinc and magnesium chloroses also occur. A distinctive kind of yellowing occurs on diseased plants: spots appear, and at first yellowing appears only on the lower or upper leaves or only in the intervenous areas. Hereditary chlorosis of plants (variegation, gold-leafedness) is mutagenic and inherited; it is used in the selection of ornamental plants to develop variegated forms.

The prevention of chlorosis entails the application of mineral and mineral fertilizers. Carbonate soils are acidified, interrows of orchards are mulched and planted with ground cover, and pests that are carriers of infection are destroyed. Treatment of noninfectious chlorosis involves applying deficient nutrient elements close to the active zone of the root system and administering nonradical dressings and injections of solutions containing trace elements into the trunks, branches, and roots of fruit trees. Plants suffering from infectious chlorosis are removed.


Dement’eva, M. I. Bolezni plodovykh kul’tur. Moscow, 1962.
Shpota, L. A. Khloroz rastenii v Chuiskoi doline i bor’ba s nim. Frunze, 1968.
Nakaidze, I. A. Pochvennye usloviia i khloroz vinogradnoi lozy v Gruzii. Tbilisi, 1969.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Melon chlorotic leaf curl virus, a new begomovirus associated with Bemisia tabaci infestations in Guatemala.
Moreover, dynamic changes in the local feature (the chlorotic part in the 3rd fully expanded leaf) also differed significantly among the nutrient supply conditions.
The second evidence of coinfection between 'Cotton leaf curl burewala virus' (CLCuBuV), a begomovirus with dicot infecting mastrevirus;'Chickpea chlorotic dwarf virus' (CpCDV) was reported by Manzoor et al.
The top sides of the leaves display the characteristic dark stippling, while the leaf in the back is chlorotic and may soon drop.
Phosphatase activities of both cultivars were similar to that of chlorotic bahia-T9.
Direct injuries are caused by sucking of sap, potentially causing decreased plant vigor, defoliation, wilting, chlorotic spots and premature leaf fall.
Accentuating this impression is a vocabulary that draws a persistent parallel between his family's decline and that of a chlorotic plant.
This technique, including TaqMan real-time PCR, has been widely used for the diagnosis of pathogens such as planta botrytis cinerea [24], sugarcane yellow leaf virus [19], maize chlorotic mottle virus [8], and cucumber vein yellowing virus [25].
treated with 100 mg [L.sup.-1] of Ni showed chlorotic leaves with gray spots that coalesced and became necrotic (Campanharo et al., 2010).
His almost endless sentences are delivered in a patois so uncouth--adjectives like "chlorotic" and "morbose" abound--and so badly pronounced whenever it ventures into foreign terminology (apergu becomes "apercoo") that it resembles a Justice Department position paper.
Anyone with family or friends gardening on the chalk downs of southern England, or similar geological localities, is likely to be given a chlorotic rhododendron, its leaves turning yellow as its chlorophyll-making processes fail on the alkaline soil.