ZmCCT haplotype H5 improves yield, stalk-rot resistance, and drought tolerance in maize

ABSTRACT: The ZmCCT locus underlies both stalk-rot resistance and photoperiod sensitivity in maize (Zea mays L.). We previously introduced nine resistant ZmCCT haplotypes into seven elite but susceptible maize inbred lines (containing the haplotype H1) to generate 63 backcross families. Here, we continued backcrossing, followed by selfing, to develop 63 near-isogenic lines (NILs). We evaluated 22 of these NILs for stalk-rot resistance and flowering time under long-day conditions. Lines harboring the haplotype H5 outperformed the others, steadily reducing disease severity, while showing less photoperiod sensitivity. To demonstrate the value of haplotype H5 for maize production, we selected two pairs of NILs, 83B28H1/83B28H5 and A5302H1/A5302H5, and generated F1 hybrids with the same genetic backgroun

SUBMITTER: Tong L 

PROVIDER: S-EPMC9421135 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature