Chlorosis

Chlorosis is a conditional by chlorophyll deficiency disease symptom ( deficiency ) in land plants, for example, in the grapevine. The disease is manifested by a characteristic pattern of damage.

Chlorosis is usually accompanied with a yellowing of leaves and often with combustion -like leaf injury and can lead to necrosis (death of leaf tissue ). It is usually a sign of a lack of minerals, particularly boron, iron, magnesium, sulfur or nitrogen, and can often also too high a content of sodium chloride in the base close. Also persistent water shortages can lead to chlorosis, because by these, the nutrients are not transported in sufficient quantity.

Possible Causes

• Genetically controlled and energy-dependent aging ( senescence )
• Deficiency diseases (nitrogen, iron, magnesium, calcium, potassium)
• Poisoning by herbicides or biuret
• Abiotic stressors such as lack of water, glare, salt oversupply, the action of strong UV radiation, gamma radiation, ozone
• Strong temperature fluctuations
• Infections with the following inhibition of chlorophyll synthesis Blocking of electron transport in photosystem I or II
• Damage to the membrane system of chloroplasts (eg by lipid oxidation) by toxins ( excreta or merger by engaging in synthesis processes )

Some varieties are particularly vulnerable, for example, Müller -Thurgau, Pinot Noir and Traminer.

Swell

• Gerhart Drews, Günter Adam, Cornelia Heinze: Molecular Plant Virology, Berlin 2004, pp. 16ff ISBN 3-540-00661-3