Varietal Differences of Yield, Morphological, and Biochemical Parameters of Allium cepa L. under Precipitation Excess in Different Phenological Phases

Flooding is an important factor, decreasing Allium cepa bulb yield and quality. A comparison, in terms of biometrical biochemical parameters, five cultivars, grown at two different locations, characterized by contrasting conditions water availability, i.e., precipitation excess the end (A) or beginning (B) plant growth, revealed a significant decrease weight, height, diameter, increase oxidative stress such as total antioxidant activity polyphenol content, monosaccharides, proline, malonic dialdehyde condition excessive soil humidity vegetation period (A). Among cultivars studied (Zolotnichok, Zolotie cupola, Black prince, Globus, Myachkovsky), lowest variations above parameters under cycle were recorded Zolotnichok which was accordance with their high adaptability. Cultivar Myachkovsky showed highest differences examined between B conditions. Outer scale demonstrated stability both regions. The participation polyphenols, defense against hypoxia, caused waterlogging, proved correlation coefficients inner (‘r’ from +0.714 to +0.920) latter −0.745 −0.924). High adaptability (Zolotie Zolotnichok, prince) significantly lower MDA inner/outer scales ratio lipids outer/inner compared moderate results provide information regarding peculiarities diverse humidity, should be considered future breeding activities onion genotypes,