Development of environment-sensitive genic male sterile lines and two-line hybrid rice

摘要

Five environment-sensitive genic male sterile (EGMS) lines and six two-line hybrid rice varieties have been developed and released in the past six years.Hua102S, Hua103S, and Hua104S had very early growth duration, 77–81 days from seeding to heading in the spring season and 58–64 days in the summer season at Wuhan. They were used for developing first-crop two-line hybrids in central China. Hua888S had early growth duration, 83 and 63 days from seeding to heading in the spring and summer seasons, which was used for developing second two-line rice hybrids. Hua201S was a line with medium growth duration, 102 and 73 days from seeding to heading in the spring and summer seasons for developing a single-crop hybrid. Hua201S was photothermosensitive,and its critical temperature and photoperiod points of fertility alteration were 23.5 °C and 13.5 h, respectively. Other four-line hybrids were thermosensitive, and their critical temperature points of fertility alteration were 23.5 °C. Hua-liangyou103, Hua-liangyou105, and Hua-liangyou106 had very short growth duration, with 105–110 days from seeding to harvest, and 6.75 t ha–1 of yield for the first crop. Hua-liangyou8885 was used for a second crop,with 115 days from seeding to harvest and 7.0 t ha–1 of yield. Hua-liangyou1206 was a high-yielding hybrid for one crop and it had 8.6 t ha–1 of yield and 135 days of life cycle.