Research on breeding and testing of hybrid waxy maize variety QT559 in Quang Ngai province

Abstract

The results of evaluating the ability to combine pure lines in the three crops of summer-autumn 2021, winter 2021, winter - spring 2021 - 2022, have determined that line N59 has a high ability to combine with line N7C, with corresponding GCA values. through cases: 17.93; 3.70; 19.90. The N59 x N7C hybrid combination has high true heterosis (Hb) and high standard heterosis (Hs), respectively across crops: 120.5%, 35.1%, 93.7%, 5.9%, 120.9%, 33.3%. The hybrid combination N59//N7C was named like QT559. Results of a small-scale trial in Quang Ngai in the summer -autumn 2023 and the winter-spring 2023 - 2024, with a fresh corn harvest time of 76 days (winter -spring crop) and 65 days (summer - autumn crop); fresh corn yield is 10.77 - 10.83 tons/ha, average 10.80 tons/ha, exceeding MX6 variety by 23.2%; the quality is fresh and chewy, the taste is stronger than MX6; sheath blight disease (score 1 - 2), large leaf spot disease (score 2), stem rot disease (score 1 - 2); stiff tree, good fall resistance, has many prospects in Quang Ngai province.