ARS | Publication request: FLOODING TOLERANCE OF 25 CITRUS ROOTSTOCKS GROWING IN A NURSERY

Submitted to: International Society of Citriculture Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 2003
Publication Date: February 15, 2004
Citation: Curti-Diaz, S., Maza-Lopez, I., Guerra-Hernandez, C., Loredo-Salazar, R., Sanchez-Gonzalez, A., Krueger, R. 2004. Flooding tolerance of 25 citrus rootstocks growing in a nursery. International Society of Citriculture Abstracts. p43.

Technical Abstract: The study was carried out in Veracruz, Mexico in 2003 and consisted in subjecting 25 different citrus rootstocks to four levels of flooding. The levels were: 0 (control, with normal watering), 15, 30 and 45 days during which they remained completely flooded. There were four replications of one plant per rootstock. Symptoms that the rootstock presented were registered. The height of the plant and the fresh and dry weight of root and canopy, were measured as well as the percentage of the root rotting and the yellowing of the central leaf vein. The rootstocks were grouped according to the symptoms of damage presented, as follows: Group 1 (without symptoms): Troyer, Yuma, C-35, Sacaton, Rubidoux, Benecke, Carrizo, Flying Dragon and Hiryu. Group 2 (moderate symptoms): "California", Swingle, X-639, Gou Tou Cheng, Amblycarpa and Volkameriana and, Group 3 (severe symptoms): Cleopatra, Sour Orange, Sweet Orange, Depressa, Ranpur, Macrophylla, Sun Chu Sha, Taiwanica, Rough lemon and Sunki. With respect to root weight, it was greatest when there were 15 days of stress, but thereafter it began to diminish because of decay at 30 and 45 days. The yellowing of the central leaf vein was noticed after 32 days of flooding but only on eight rootstocks. The leaf-area of the rootstocks was smaller at 45 days of flooding compared with the control plant. Root decay was severe for Cleopatra (57.5%) and mild for Benecke, C-35, Hiryu and Troyer (less than 5%).