1 Absent daddy but i mportant father Nathanaël M.A. Jacquier12 Thomas Widiez1

2025-04-28 1 0 446.81KB 4 页 10玖币

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Absent daddy, but important father

Nathanaël M.A. Jacquier1,2, Thomas Widiez1*

1 Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS,

INRAE, F-69342, Lyon, France.

2 Limagrain, Limagrain Field Seeds, Research Centre, F-63360 Gerzat, France.

Email: thomas.widiez@ens-lyon.fr

PMID: 34887520 DOI: 10.1038/s41477-021-01030-9

Abstract:

Mixing maternal and paternal genomes is the base of plant sexual reproduction, but some so-called

“haploid inducer lines” lead to the formation of seeds with well-developed embryos with solely the

maternal genome. A recent study added a new piece to the puzzle of this enigmatic in planta haploid

embryo induction process.

Like most eukaryotes, plants carry a dual genome of paternal and maternal origins. Sexual

reproduction allows mixing of genetic information, which produces diversity that enables breeding of new

plant varieties with improved agronomic traits. However, plant breeding process often requires

homozygous or inbred lines with fixed genetic material in order to evaluate the performances of various

genetic combinations. To generate these lines in conventional breeding is a time-consuming process which

needs multiple-generation of selfing. The production of doubled haploids plants represents a shortcut to

obtaining lines of genome homozygosity, which could be achieved in two rather than six or more

generations1. Maize breeding has benefited greatly from this doubled haploid technology thanks to the

haploid inducer lines that induce the formation of haploid embryos in seeds1 (Fig. 1a). The embryos

germinate into haploid seedlings carrying a single set of maternal chromosomes1. Recently, haploid inducer

lines have been also elegantly repurposed as powerful tool to deliver genome-editing machinery into

commercial crop varieties that are recalcitrant to transformation techniques1,2. Despite being a powerful

tool in plant breeding and research applications, the molecular basis behind in planta haploid induction

remains fragmentary1. In this issue of Nature Plants, Li et al.3 found that mutating the phospholipase D3

gene (ZmPLD3) can induce maternal haploid embryos, adding a new piece of understanding about this

intriguing and useful biological process.

Genetic architecture of maize haploid inducer lines is complex, and up to now only two molecular

players have been identified by quantitative trait locus (QTL) mapping. The MATRILINEAL/NOT LIKE

DAD/ZmPHOSPHOLIPASE-A1 (MTL/NLD/ZmPLA1) gene was first identified as a key regulator whose

mutation causes haploid induction in maize4–6. Later on, the mutation in the DOMAIN MEMBRANE PROTEIN

gene (ZmDMP) was shown to increase by up to six-fold the haploid induction rate when combined with the

mtl/nld/zmpla1 mutation7. Since MTL/NLD/ZmPLA1 is a pollen specific gene belonging to the phospholipase

family4–6, Li and colleagues conducted data mining into literature to look for other pollen specifically

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摘要：

1Absentdaddy,butimportantfatherNathanaëlM.A.Jacquier1,2,ThomasWidiez1*1LaboratoireReproductionetDéveloppementdesPlantes,UnivLyon,ENSdeLyon,UCBLyon1,CNRS,INRAE,F-69342,Lyon,France.2Limagrain,LimagrainFieldSeeds,ResearchCentre,F-63360Gerzat,France.Email:thomas.widiez@ens-lyon.frPMID:34887520DOI:10.103...

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1 Absent daddy but i mportant father Nathanaël M.A. Jacquier12 Thomas Widiez1

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