Selection of F4, F5 and F6 soybean breeding lines for high yield and large seed size

Abstract

The first step in a cultivar development is to form a population with genetic variability for the characters of interest. This is done by hybridization of genetically different parents. Hybridization was made to combine the characters of high yield potential, wide adaptability, desirable agronomic characters, and large seed size by using cv. Tanggamus, Sibayak, Argomulyo, Anjasmoro, Panderman and Local Tegal. Amount of 4800 F4 lines originated from five single cross combination were planted in rice field, Sukawening, Garut District, West Java on early dry season 2007. Pedigree method of selection was used. Each line was grown in one row of three meters length and 40 cm between rows. There was a high variability on agronomic characters (plant height, pod number, seed yield and seed size). Amount 1311 F5 lines were selected and grown in the same location on late dry season 2007. Amount of 540 F6 lines were selected and grown in the same location on early rainy season 2007/2008. Sixty-two F7 lines were selected, and 42 lines among them had high yield and large seed size.