Sulfur Fertilization and Waterlogging Stress Resistance : Elucidation of the underlying mechanisms in wheat and rapeseed

The displayed thesis consists of three independent experiments. The first study figured out the drastic effect of waterlogging on S-uptake, growth, yield, and yield quality of inbred (Kredo) and hybrid (Hyvento) wheat cultivars in two crucial stages of growth, namely tillering stage/early waterlogging (Feekes Stage 6) and/or ear emergence stage/late waterlogging (Feekes Stage 10.1). The hybrid (Hyvento) variety showed a lesser decline in S concentration and uptake compared with inbred (Kredo). Waterlogging at Feekes Stage 10.1 could drastically affect S uptake, yields, and protein patterns in both varieties, compared with Feekes Stage 6. In the second experiment, different levels of supplemented S in soil, ranging from no-S to high-S was applied to investigate the S-induced stress resistance of oilseed rape (Brassica napus L.) plants under waterlogging condition. Sulfur supplementation, in soil from medium-S to high-S levels significantly improved the antioxidative defense system and growth. In the third experiment, the effect of S supplementation as foliar-S and/or soil S-fertilized plants on growth, photosynthetic response, antioxidant defense system, and impact on ion homeostasis in Brassica napus plants grown under waterlogging was investigated. Foliar S protected rapeseed plants from waterlogging-induced adversities through restricting ROS-induced cellular damage by raising the activities of antioxidant enzymes, non-enzymatic antioxidants and accumulating lesser Feand Mn, but more P, S, Zn in rapeseedplants.


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