Maize biology: From functional genomics to breeding application

Yan, Jianbing; Tan, Bin

doi:10.1111/jipb.12819

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Maize is the most important C4 crop, and salt stress is one of the major environmental stressor restricting maize production worldwide (Hake and Ross‐Ibarra, 2015 ; Hanks et al ., 1978 ; Yan and Tan, 2019 ). Natural maize populations show vastly diverse of salt stress tolerance (Luo et al ., 2019 , 2021 ; Zhang et al ., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

A teosinte‐derived allele of an HKT1 family sodium transporter improves salt tolerance in maize

Zhang

Liang

et al. 2022

Plant Biotechnology Journal

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The sodium cation (Na + ) is the predominant cation with deleterious effects on crops in saltaffected agricultural areas. Salt tolerance of crop can be improved by increasing shoot Na + exclusion. Therefore, it is crucial to identify and use genetic variants of various crops that promote shoot Na + exclusion. Here, we show that a HKT1 family gene ZmNC3 (Zea mays L. Na + Content 3; designated ZmHKT1;2) confers natural variability in shoot-Na + accumulation and salt tolerance in maize. ZmHKT1;2 encodes a Na + -preferential transporter localized in the plasma membrane, which mediates shoot Na + exclusion, likely by withdrawing Na + from the root xylem flow. A naturally occurring nonsynonymous SNP (SNP947-G) increases the Na + transport activity of ZmHKT1;2, promoting shoot Na + exclusion and salt tolerance in maize. SNP947-G first occurred in the wild grass teosinte (at a allele frequency of 43%) and has become a minor allele in the maize population (allele frequency 6.1%), suggesting that SNP947-G is derived from teosinte and that the genomic region flanking SNP947 likely has undergone selection during domestication or post-domestication dispersal of maize. Moreover, we demonstrate that introgression of the SNP947-G ZmHKT1;2 allele into elite maize germplasms reduces shoot Na + content by up to 80% and promotes salt tolerance. Taken together, ZmNC3/ZmHKT1;2 was identified as an important QTL promoting shoot Na + exclusion, and its favourable allele provides an effective tool for developing salt-tolerant maize varieties.

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Section: Introductionmentioning

confidence: 99%

A teosinte‐derived allele of an HKT1 family sodium transporter improves salt tolerance in maize

Zhang

Liang

et al. 2022

Plant Biotechnology Journal

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“…Genetic analyses have identified a set of quantitative trait loci (QTLs) controlling KNR variation 6 . Characterization of these KNR QTLs may provide genetic and molecular knowledge of inflorescence development that can enhance breeding efforts for improving grain yield [7][8][9][10] . Nonetheless, no natural causal variants associated with KNR have been elucidated.…”

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confidence: 99%

A serine/threonine protein kinase encoding gene KERNEL NUMBER PER ROW6 regulates maize grain yield

Jia

et al. 2020

Nat Commun

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Increasing grain yield of maize (Zea mays L.) is required to meet the rapidly expanding demands for maize-derived food, feed, and fuel. Breeders have enhanced grain productivity of maize hybrids by pyramiding desirable characteristics for larger ears. However, loci selected for improving grain productivity remain largely unclear. Here, we show that a serine/threonine protein kinase encoding gene KERNEL NUMBER PER ROW6 (KNR6) determines pistillate floret number and ear length. Overexpression of KNR6 or introgression of alleles lacking the insertions of two transposable elements in the regulatory region of KNR6 can significantly enhance grain yield. Further in vitro evidences indicate that KNR6 can interact with an Arf GTPase-activating protein (AGAP) and its phosphorylation by KNR6 may affect ear length and kernel number. This finding provides knowledge basis to enhance maize hybrids grain yield.

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“…Maize is estimated to account for more than half of future cereal demand growth. Thus, there is a huge stream of innovation for maize breeders when trying to significantly increase maize productivity in an environmentally sensitive way ( Yan and Tan, 2019 ). Since 2013, maize has become the largest crop in China in terms of planting area and production.…”

Section: Introductionmentioning

confidence: 99%

Multi-trait selection for mean performance and stability of maize hybrids in mega-environments delineated using envirotyping techniques

Yue

Olivoto

et al. 2022

Front. Plant Sci.

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Under global climate changes, understanding climate variables that are most associated with environmental kinships can contribute to improving the success of hybrid selection, mainly in environments with high climate variations. The main goal of this study is to integrate envirotyping techniques and multi-trait selection for mean performance and the stability of maize genotypes growing in the Huanghuaihai plain in China. A panel of 26 maize hybrids growing in 10 locations in two crop seasons was evaluated for 9 traits. Considering 20 years of climate information and 19 environmental covariables, we identified four mega-environments (ME) in the Huanghuaihai plain which grouped locations that share similar long-term weather patterns. All the studied traits were significantly affected by the genotype × mega-environment × year interaction, suggesting that evaluating maize stability using single-year, multi-environment trials may provide misleading recommendations. Counterintuitively, the highest yields were not observed in the locations with higher accumulated rainfall, leading to the hypothesis that lower vapor pressure deficit, minimum temperatures, and high relative humidity are climate variables that –under no water restriction– reduce plant transpiration and consequently the yield. Utilizing the multi-trait mean performance and stability index (MTMPS) prominent hybrids with satisfactory mean performance and stability across cultivation years were identified. G23 and G25 were selected within three out of the four mega-environments, being considered the most stable and widely adapted hybrids from the panel. The G5 showed satisfactory yield and stability across contrasting years in the drier, warmer, and with higher vapor pressure deficit mega-environment, which included locations in the Hubei province. Overall, this study opens the door to a more systematic and dynamic characterization of the environment to better understand the genotype-by-environment interaction in multi-environment trials.

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Maize biology: From functional genomics to breeding application

Cited by 8 publications

References 21 publications

A teosinte‐derived allele of an HKT1 family sodium transporter improves salt tolerance in maize

A teosinte‐derived allele of an HKT1 family sodium transporter improves salt tolerance in maize

A serine/threonine protein kinase encoding gene KERNEL NUMBER PER ROW6 regulates maize grain yield

Multi-trait selection for mean performance and stability of maize hybrids in mega-environments delineated using envirotyping techniques

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