An albino corn plant with no chlorophyll (left) beside a normal plant (right)
In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white. The affected plant has little or no ability to manufacture carbohydrates through photosynthesis and may die unless the cause of its chlorophyll insufficiency is treated and this may lead to a plant disease called rusts, although some chlorotic plants, such as the albino Arabidopsis thaliana mutant ppi2, are viable if supplied with exogenous sucrose.[1]
The word chlorosis is derived from the Greek khloros meaning "greenish-yellow", "pale green", "pale", "pallid", or "fresh".
In viticulture, the most common symptom of poor nutrition in grapevines is the yellowing of grape leaves caused by chlorosis and the subsequent loss of chlorophyll. This is often seen in vineyard soils that are high in limestone such as the Italian wine region of Barolo in the Piedmont, the Spanish wine region of Rioja and the French wine regions of Champagne and Burgundy. In these soils the grapevine often struggles to pull sufficient levels of iron which is a needed component in the production of chlorophyll.[2]
^Kubis S, Patel R, Combe J, et al. (August 2004). "Functional specialization amongst the Arabidopsis Toc159 family of chloroplast protein import receptors". Plant Cell. 16 (8): 2059–77. doi:10.1105/tpc.104.023309. PMC 519198. PMID 15273297.
^Wine & Spirits Education Trust "Wine and Spirits: Understanding Wine Quality" pg 16, Second Revised Edition (2012), London, ISBN 9781905819157
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control. Citrus plants can also develop a deficiency condition called chlorosis, characterized by yellowing leaves highlighted by contrasting leaf veins...
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