Development of an 8-Parent MAGIC Population and Construction of their intensively -selected Multi-Genotype Varieties in Rabi Sorghum [Sorghum bicolor (L.) Moench]

Abstract

Two set of MAGIC founder lines were used to develop 8 parent MAGIC populations, first set includes M35-1(M1), DSV5 (M3),CSV 216 (M4),CSV29R (M5),CRS 20 (M6), Sel.3 (M7), CRS 4 (M8) and the parents viz. CSV 26, Phule Suchitra, CSV 14R, CRs 4, PKV Kranti, Solapur Dagdi, DSV 4, Phule Revati forms the second set. Selected founder lines are from different Rabi sorghum growing areas including Parbhani, rahuri, Solapur, Vijayapura, Dharwad and Gulbarga districtrs of Maharashtra and Karnataka. These two sets consists of three types of varieties (1) High grain & Fodder-quality type (2) High Yielding type (3) Shoot fly and Charcoal rot tolerant type. we are employing two strategies for the development of MAGIC populations .In the first strategy , we made convergent crosses among set 1-8 parental lines and synthesized four single crosses viz. M35-1 x CSV 29R, Parbhani Moti x CRS 20, DSV 5 x Sel.3, and CSV 216R x CRS 4 during Rabi 2015-16. In Kharif 2016, two double crosses were generated from four single crosses and these DCs are planted for 3rd round of hybridization for evolving different plant lines in current rabi season (2016-17). Where as in second strategy , other set of lines were mated in a Half diallel fashion and generated 28 two way recombinants during Rabi 2015-16. Intercrssing among 28 two way crosses is being done during Rabi 2016-17. The double crosses are to be generated in such a way that no single parent should involve more than once and 72 such double crosses are pair-wise mated to evolve different plant lines in subsequent seasons. Different plant lines derived from 3rd round of hybridization are selfed and evaluated for rabi adaptive traits In the later stabilized generations , categorization and construction of various types of multi-genotype varieties . from the superior lines to be done , besides evaluating and comparing their performance with that of its component lines.