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单倍型可提高玉米的产量、抗茎腐病能力和耐旱性。

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

作者信息

Tong Lixiu, Yan Mingzhu, Zhu Mang, Yang Jie, Li Yipu, Xu Mingliang

机构信息

State Key Laboratory of Plant Physiology and Biochemistry, College of Agronomy and Biotechnology, National Maize Improvement Center, Center for Crop Functional Genomics and Molecular Breeding, China Agricultural University, Beijing, China.

Food Crops Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, China.

出版信息

Front Plant Sci. 2022 Aug 15;13:984527. doi: 10.3389/fpls.2022.984527. eCollection 2022.

DOI:10.3389/fpls.2022.984527
PMID:36046586
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9421135/
Abstract

The locus underlies both stalk-rot resistance and photoperiod sensitivity in maize ( L.). We previously introduced nine resistant haplotypes into seven elite but susceptible maize inbred lines (containing the haplotype ) 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 outperformed the others, steadily reducing disease severity, while showing less photoperiod sensitivity. To demonstrate the value of haplotype for maize production, we selected two pairs of NILs, 83B28 /83B28 and A5302 /A5302 , and generated F hybrids with the same genetic backgrounds but different alleles: 83B28 × A5302 , 83B28 × A5302 , 83B28 × A5302 , and 83B28 × A5302 . We performed field trials to investigate yield/yield-related traits, stalk-rot resistance, flowering time, and drought/salt tolerance in these four hybrids. 83B28 × A5302 performed the best, with significantly improved yield, stalk-rot resistance, and drought tolerance compared to the control (83B28 × A5302 ). Therefore, the haplotype has great value for breeding maize varieties with high yield potential, stalk-rot resistance, and drought tolerance.

摘要

该基因座影响玉米（Zea mays L.）的茎腐病抗性和光周期敏感性。我们之前将9种抗性单倍型导入7个优良但感病的玉米自交系（含有该单倍型），以产生63个回交家系。在此，我们继续进行回交，随后自交，以培育63个近等基因系（NILs）。我们在长日照条件下评估了其中22个NILs的茎腐病抗性和开花时间。携带该单倍型的品系表现优于其他品系，病情严重程度稳步降低，同时光周期敏感性较低。为了证明该单倍型对玉米生产的价值，我们选择了两对NILs，83B28Ht1/83B28Ht2和A5302Ht1/A5302Ht2，并产生了具有相同遗传背景但不同Ht等位基因的F1杂种：83B28Ht1×A5302Ht1、83B28Ht1×A5302Ht2、83B28Ht2×A5302Ht1和83B28Ht2×A5302Ht2。我们进行了田间试验，以研究这四个杂种的产量/产量相关性状、茎腐病抗性、开花时间和耐旱/耐盐性。83B28Ht1×A5302Ht1表现最佳，与对照（83B28Ht2×A5302Ht2）相比，产量、茎腐病抗性和耐旱性显著提高。因此，该Ht单倍型对培育具有高产潜力、茎腐病抗性和耐旱性的玉米品种具有重要价值。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/f389e10f48e4/fpls-13-984527-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/09015997380e/fpls-13-984527-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/cf672e9ec742/fpls-13-984527-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/cd6e103a4ba2/fpls-13-984527-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/54cb5299b73a/fpls-13-984527-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/6f6bf8f07a6c/fpls-13-984527-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/b7bd08154d9a/fpls-13-984527-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/f389e10f48e4/fpls-13-984527-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/09015997380e/fpls-13-984527-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/cf672e9ec742/fpls-13-984527-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/cd6e103a4ba2/fpls-13-984527-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/54cb5299b73a/fpls-13-984527-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/6f6bf8f07a6c/fpls-13-984527-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/b7bd08154d9a/fpls-13-984527-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cb23/9421135/f389e10f48e4/fpls-13-984527-g007.jpg

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