Abstract
This study examined the effects of plant mineral content on different cycles of recurrent selection of the flood- tolerant, open-pollinated maize variety BRS 4154 - Saracura, under soil flooding. Experiments with the main treatments flooded or unflooded were conducted in Sete Lagoas, MG - Brazil. Samples of the cycles 1, 5, 9 and 15 were sown in a randomized block design. The open-pollinated variety BR 107 and single-cross hybrid BRS 1010 were used as flood- susceptible controls. The stress caused by water excess in the soil reduced the nitrogen content in the cycles 5 and 9, and calcium in cycle 15; but increased potassium in cycle 1. However, it did not significantly influence the content of phosphorus, magnesium, sulfur, zinc, and copper. Additionally, recurrent selection under flooding diminished potassium and calcium content along the cycles.
Highlights
Anoxic conditions in the rhyzosphere are a result of overflowing rivers, over-irrigation, inadequate drainage, and full impoundment of reservoirs (Herschbach et al 2005)
Low soil oxygen concentration or total absence of oxygen affect the nutrient uptake, synthesis and translocation of growth regulators, as well as photosynthesis, respiration and carbohydrate partitioning, decreasing the yield of crops grown in soil with inadequate drainage or subjected to transient flooding (Ferrer et al 2005)
Plant species with tolerance or even resistance to hypoxia develop morphological and biochemical adaptation mechanisms which may be useful criteria for the selection of genotypes with increased tolerance to waterlogging (Ferrer et al 2005)
Summary
Anoxic conditions in the rhyzosphere are a result of overflowing rivers, over-irrigation, inadequate drainage, and full impoundment of reservoirs (Herschbach et al 2005). Recent studies have identified tropical maize cultivars with some degree of tolerance to hypoxia This has been attributed to biochemical and physiological adaptations that lead to stomatal closure during the stress period, as well as morphological modifications, including formation of adventitious roots, aerenchymas and root porosity thereby facilitating the aeration of flooded tissue in tolerant plants (Drew et al 1979, Kleiman et al 1992, Vignolio et al 1999, Dantas et al 2000, Romero et al 2003, Mano et al 2006, Mano and Omori 2007, Mano et al 2007)
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