Soybean variety 75408-57N

#This invention relates generally to the field of soybean breeding. In particular, the invention relates to a soybean variety designated 75408-57N that includes plants, plant parts, and seeds of soybean variety 75408-57N. Methods for producing soybean plants by crossing soybean variety 75408-57N with itself or any different soybean plant are an integral part of this invention as are the resultant soybean plants, including the plant parts and seeds. This invention further relates to methods for producing 75408-57N-derived soybean plants and to methods for regenerating such plants from tissue cultures of regenerable cells as well as the plants obtained therefrom. Methods for producing a soybean plant containing in its genetic material one or more transgenes and to the transgenic soybean plants produced by that method are also a part of this invention.

#Soybean (Glycine max) is a major grain crop valued for the high levels of oil and protein found in soybean seed. Soybean breeding has resulted in significant improvements in yield potential, stability of yield, adaptation of the species to mechanical harvest, and yield protection through improved disease resistance.

#Due to the nature of plant science agriculture, broadly defined as a manipulation of available plant resources to meet the needs of the growing human population, the environment in which plants are grown for agricultural production continuously offers new obstacles to agricultural production. Each new variety, or cultivar, released to agricultural production is selected for the purpose of increasing yield resulting from increased disease resistance to prevalent diseases, or from direct or indirect improvement in yield potential or efficiency of production. Development of stable, high yielding varieties with superior characteristics is an ongoing goal of soybean breeders.

#In the claims, descriptions, and tables that follow, numerous terms are used and are defined as follows:

#Aerial Web Blight caused by the fungus, Rhizoctonia solani, is visually scored from 1 to 9 based on the severity of fungal spots on vegetative tissue. A score of 1 indicates the most tolerant (no symptoms) and a score of 9 indicates the most susceptible.

#Brown Stem Rot (BSR) caused by the fungus, Phialophora gregata, is visually scored from 1 to 9 based on the severity of interveinal leaf chlorosis (yellowing) and necrosis of stems. A score of 1 indicates the most resistance (no symptoms) and a score of 9 indicates the most susceptible.