Code:
OIV
407
Name: Resistance to potassium deficiency
Category:
,
GROUP OF CHARACTERISTICS,
ORGAN
Subcategory:
POTASSIUM,
ABIOTIC RESISTANCE,
PLANT
Code: OIV 407
Name: Resistance to potassium deficiency
Category: , GROUP OF CHARACTERISTICS, ORGAN
Subcategory: POTASSIUM, ABIOTIC RESISTANCE, PLANT
Primay descriptor priority list
For a quick characterisation of varieties the Genres CT 96 No81 - partners compiled a Primary description priority list. The list encompasses 14 priority one primary descriptors. The chosen descriptors show a good discriminating power between varieties. Most of them are easy to score.
Description
The observations should be carried out starting from the pre-flowering stage preferably in young vineyards under the same cultivation conditions where the symptoms can be more frequent and stronger. Greater expression of the deficiency symptoms can occur in the middle of summer on secondary shoots. Observations should be done on the same environment and, whether the case, the vinifera varieties should be grafted on the same rootstock. Main symptoms: - leaves: chlorosis of the edges followed by necrosis; curling of the leaf edges; the mature leaves turn brown (brunissure) in the upper side, but green in the lower side of the blade; - shoots: low development with short internodes and short shoot length; - bunches: rather abnormal shape; unripe grapes. 1 = High incidence of plants with severe symptoms, above all during the springtime. 3 = Medium high incidence of plants with severe symptoms, above all during the springtime. 5 = Few scattered plants with less intense symptoms. 7 = Few plants with very low symptoms. 9 = No visible symptoms in any plants.Level expression
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