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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 It might be outdated or ideologically biased.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 ?
In this paper, we selected the green part rather than the chlorotic part as the ROI (region of interest) in segmentation because the chlorotic part was small at the beginning of the leaf chlorosis, and its spatial heterogeneity was higher than that of the green part, making it difficult to select a representative region of interest for complete segmentation.
Summing up, 1) the local populations at issue respond to salt stress according to the Munns biphasic model; 2) ion toxicity manifestation is typical of each and every cultivar: necrosis-free chlorosis, chlorosis and necrosis; chlorosis-free leaf curling; 3) the best response to salt stress has been found in the Botosani 1 local population that should be recommended for further research in salinity conditions.
However, when using other methods of inoculation (three days after planting), the treated cuttings showed signs of chlorosis. This result was also observed in treatments inoculated with Serratia sp.
Based on the results of the logistic regression, nutrient addition was a significant predictor of the probability of leaf chlorosis in donor plants (P < 0.001).
Early morning watering will eliminate airborne diseases and problems like leaf curl and chlorosis.
Chlorosis and sporulation similar to that in the field were observed on inoculated plants 14 days post inoculation (Figures 4, 5).
The objective of this study was to determine the inheritance of RWA resistance in this bread wheat cultivar, using a screening method based on differences in the leaf chlorosis of resistant and susceptible types following insect challenge.
- Rebecca Strong, Poole, Dorset YELLOWING 2 signals lime chlorosis. It affects ericaceous plants when there is too much lime in the soil, preventing it from getting iron.
soulangeana are lime tolerant but may display chlorosis (leaf yellowing) if soil pH is too high.