A New Breeding Strategy towards Introgression and Characterization of Stay-Green QTL for Drought Tolerance in Sorghum

Nasrein Mohamed Kamal, Yasir Serag Alnor Gorafi, Hanan Abdeltwab, Ishtiag Abdalla, Hisashi Tsujimoto and Abdelbagi Mukhtar Ali Ghanim
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Nasrein Mohamed Kamal: Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
Yasir Serag Alnor Gorafi: Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
Hanan Abdeltwab: Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Ishtiag Abdalla: Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Hisashi Tsujimoto: Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
Abdelbagi Mukhtar Ali Ghanim: Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan

Agriculture, 2021, vol. 11, issue 7, 1-19

Abstract: Several marker-assisted selection (MAS) or backcrossing (MAB) approaches exist for polygenic trait improvement. However, the implementation of MAB remains a challenge in many breeding programs, especially in the public sector. In MAB introgression programs, which usually do not include phenotypic selection, undesired donor traits may unexpectedly turn up regardless of how expensive and theoretically powerful a backcross scheme may be. Therefore, combining genotyping and phenotyping during selection will improve understanding of QTL interactions with the environment, especially for minor alleles that maximize the phenotypic expression of the traits. Here, we describe the introgression of stay-green QTL ( Stg 1– Stg 4) from B35 into two sorghum backgrounds through an MAB that combines genotypic and phenotypic (C-MAB) selection during early backcross cycles. The background selection step is excluded. Since it is necessary to decrease further the cost associated with molecular marker assays, the costs of C-MAB were estimated. Lines with stay-green trait and good performance were identified at an early backcross generation, backcross two (BC 2 ). Developed BC 2 F 4 lines were evaluated under irrigated and drought as well as three rainfed environments varied in drought timing and severity. Under drought conditions, the mean grain yield of the most C-MAB-introgression lines was consistently higher than that of the recurrent parents. This study is one of the real applications of the successful use of C-MAB for the development of drought-tolerant sorghum lines for drought-prone areas.

Keywords: sorghum; stay-green; QTL; C-MAB; drought (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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