dc.creatorChen, S.
dc.creatorDang, D.
dc.creatorYubo Liu
dc.creatorShuwen Ji
dc.creatorHongjian Zheng
dc.creatorZhao, C.
dc.creatorDong, X.
dc.creatorLi, C.
dc.creatorYuan Guan
dc.creatorAo Zhang
dc.creatorYanye Ruan
dc.date2023-06-22T20:00:12Z
dc.date2023-06-22T20:00:12Z
dc.date2023
dc.date.accessioned2023-07-17T20:10:36Z
dc.date.available2023-07-17T20:10:36Z
dc.identifierhttps://hdl.handle.net/10883/22609
dc.identifier10.3389/fpls.2023.1165582
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7514352
dc.descriptionIntroduction: Drought stress is one of the most serious abiotic stresses leading to crop yield reduction. Due to the wide range of planting areas, the production of maize is particularly affected by global drought stress. The cultivation of drought-resistant maize varieties can achieve relatively high, stable yield in arid and semi-arid zones and in the erratic rainfall or occasional drought areas. Therefore, to a great degree, the adverse impact of drought on maize yield can be mitigated by developing drought-resistant or -tolerant varieties. However, the efficacy of traditional breeding solely relying on phenotypic selection is not adequate for the need of maize drought-resistant varieties. Revealing the genetic basis enables to guide the genetic improvement of maize drought tolerance. Methods: We utilized a maize association panel of 379 inbred lines with tropical, subtropical and temperate backgrounds to analyze the genetic structure of maize drought tolerance at seedling stage. We obtained the high quality 7837 SNPs from DArT's and 91,003 SNPs from GBS, and a resultant combination of 97,862 SNPs of GBS with DArT's. The maize population presented the lower her-itabilities of the seedling emergence rate (ER), seedling plant height (SPH) and grain yield (GY) under field drought conditions. Results: GWAS analysis by MLM and BLINK models with the phenotypic data and 97862 SNPs revealed 15 variants that were significantly independent related to drought-resistant traits at the seedling stage above the threshold of P < 1.02 × 10-5. We found 15 candidate genes for drought resistance at the seedling stage that may involve in (1) metabolism (Zm00001d012176, Zm00001d012101, Zm00001d009488); (2) programmed cell death (Zm00001d053952); (3) transcriptional regulation (Zm00001d037771, Zm00001d053859, Zm00001d031861, Zm00001d038930, Zm00001d049400, Zm00001d045128 and Zm00001d043036); (4) autophagy (Zm00001d028417); and (5) cell growth and development (Zm00001d017495). The most of them in B73 maize line were shown to change the expression pattern in response to drought stress. These results provide useful information for understanding the genetic basis of drought stress tolerance of maize at seedling stage.
dc.languageEnglish
dc.publisherFrontiers Media S.A.
dc.rightsCIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
dc.rightsOpen Access
dc.source14
dc.source1664-462X
dc.sourceFrontiers in Plant Science
dc.source1165582
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectErratic Rainfall
dc.subjectAdverse Impacts
dc.subjectTraditional Breeding
dc.subjectGenome-Wide Association Study
dc.subjectField Drought
dc.subjectDROUGHT TOLERANCE
dc.subjectMAIZE
dc.subjectSEEDLING STAGE
dc.subjectSINGLE NUCLEOTIDE POLYMORPHISM
dc.subjectInstitutional
dc.titleGenome-wide association study presents insights into the genetic architecture of drought tolerance in maize seedlings under field water-deficit conditions
dc.typeArticle
dc.typePublished Version
dc.coverageSwitzerland


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