Genetic gains with genomic versus phenotypic selection for drought and waterlogging tolerance in tropical maize (Zea mays L.)

Crop Journal

Akashi Sarma¹  Nagendra Sarma Barua¹  Ramesh Kumar Phagna²  Shyam Bir Singh²  Jai Prakash Shahi³  Madhumal Thayil Vinayan⁴  Kaliyamoorthy Seetharam⁴  Reshmi Rani Das⁴  Pervez Haider Zaidi⁴  Raman Babu⁴  Manish Patel⁵ 

[1] Assam Agricultural University, Jorhat 785013, Assam, India;ICAR-Indian Institute of Maize Research, Ludhiana141001, Bihar, India;Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India;International Maize and Wheat Improvement Center (CIMMYT), ICRISAT Campus, Patancheru 502324, Hyderabad, India;Main Maize Research Station, Anand Agriculture University, Anand 388001, Gujarat, India;

关键词: Drought;    Genomic selection;    Maize;    Phenotypic selection;    Waterlogging;   

DOI  :  

来源: DOAJ

【 摘 要 】

Erratic rainfall often results in intermittent drought and/or waterlogging and limits maize (Zea mays L.) productivity in many parts of the Asian tropics. Developing climate-resilient maize germplasm possessing tolerance to these key abiotic stresses without a yield penalty under optimal growing conditions is a challenge for breeders working in stress-vulnerable agro-ecologies in the region. Breeding stress-resilient maize for rainfed stress-prone ecologies is identified as one of the priority areas for CIMMYT-Asia maize program. We applied rapid cycle genomic selection (RCGS) on two multiparent yellow synthetic populations (MYS-1 and MYS-2) to improve grain yield simultaneously under drought and waterlogging conditions using genomic-estimated breeding values (GEBVs). Also, the populations were simultaneously advanced using recurrent phenotypic selection (PS) by exposing them to managed drought and waterlogging and intermating tolerant plants from the two selection environments. Selection cycles per se (C1, C2, and C3) of the two populations developed using RCGS and PS approach and their test-cross progenies were evaluated separately in multilocation trials under managed drought, waterlogging, and optimal moisture conditions. Significant genetic gains were observed with both GS and PS, except with PS in MYS-2 under drought and with GS in MYS-1 under waterlogging. Realized genetic gains from GS were relatively higher under drought conditions (110 and 135 kg ha−1 year−1) compared to waterlogging (38 and 113 kg ha−1 year−1) in both MYS-1 and MYS-2, respectively. However, under waterlogging stress PS showed at par or better than GS as gain per year with PS was 80 and 90 kg ha−1, whereas with GS it was 90 and 43 kg ha−1 for MYS-1 and MYS-2, respectively. Our findings suggested that careful constitution of a multiparent population by involving trait donors for targeted stresses, along with elite high-yielding parents from diverse genetic background, and its improvement using RCGS is an effective breeding approach to build multiple stress tolerance without compromising yield when tested under optimal conditions

【 授权许可】

Unknown