Vol. 10, Issue 11 (2021)

Author(s):
GT Basavaraja, BS Gill, Harshiya Banu, GK Naidu, Shalini N Huilgol and PG Suresha

Abstract:
In the present study, the segregating material developed from four crosses were stabilized and screened for five years (2016-2020) at two hotspots Dharwad and Ludhiana for resistance to rust and Yellow mosaic disease (YMD) respectively by Shuttle breeding. Among four crosses involved, two highly resistant varieties for rust and YMD, cross SL 979 x DSb 21 exhibited resistant reaction to both the diseases. In the said crosses one promising line viz., DLSb 1 (SL 979 x DSb 21) with maturity duration 90-95 days. The line recorded 14.3 per cent higher yield (2264 kg/ha) over the best check DSb 21 (1980 kg/ha) in station trial over the years (2019 and 2020). Therefore, the soybean line DLSb 1 was developed for multiple disease resistant and tested under Co-ordinated trial (IVT) during kharif 2020 across all zones of India and secured second rank under Central zone for yield and it exhibited moderately resistant reaction to rust at Dharwad and highly resistant reaction to YMD at hotspots viz., Ludhiana, Delhi and Jabalpur. The line exhibited 9.8 per cent higher yield (2658 kg/ha) over the check JS 20-116 (2420 kg/ha) in Central Zone. This line Dharwad Ludhiana Soybean 1 (DLSb 1) will be useful for future plant breeding programme in the development of variety for multiple disease resistance.