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This volume presents recent research achievements concerning the molecular genetic basis of agronomic traits in rice. Rice (Oryza sativa L.) is the most important food crop in the world, being a staple food for more than half of the world’s population. Recent improvements in living standards have increased the worldwide demand for high-yielding and high-quality rice cultivars. To achieve improved agricultural performance in rice, while overcoming the challenges presented by climate change, it is essential to understand the molecular basis of agronomically important traits. Recently developed techniques in molecular biology, especially in genomics and other related omics fields, can reveal the complex molecular mechanisms involved in the control of agronomic traits. As rice was the first crop genome to be sequenced, in 2004, molecular research tools for rice are well-established, and further molecular studies will enable the development of novel rice cultivars with superior agronomic performance.

Research & information: general --- Biology, life sciences --- Technology, engineering, agriculture --- chloroplast RNA splicing and ribosome maturation (CRM) domain --- intron splicing --- chloroplast development --- rice --- rice (Oryza sativa L.), grain size and weight --- Insertion/Deletion (InDel) markers --- multi-gene allele contributions --- genetic variation --- rice germplasm --- disease resistance --- microbe-associated molecular pattern (MAMP) --- Pyricularia oryzae (formerly Magnaporthe oryzae) --- Oryza sativa (rice) --- receptor-like cytoplasmic kinase (RLCK) --- reactive oxygen species (ROS) --- salinity --- osmotic stress --- combined stress --- GABA --- phenolic metabolism --- CIPKs genes --- shoot apical meristem --- transcriptomic analysis --- co-expression network --- tiller --- nitrogen rate --- rice (Oryza sativa L.) --- quantitative trait locus --- grain protein content --- single nucleotide polymorphism --- residual heterozygote --- rice (Oryza sativa) --- specific length amplified fragment sequencing --- Kjeldahl nitrogen determination --- near infrared reflectance spectroscopy --- heterosis --- yield components --- high-throughput sequence --- FW2.2-like gene --- tiller number --- grain yield --- CRISPR/Cas9 --- genome editing --- off-target effect --- heat stress --- transcriptome --- anther --- anthesis --- pyramiding --- bacterial blight --- marker-assisted selection --- foreground selection --- background selection --- japonica rice --- cold stress --- germinability --- high-density linkage map --- QTLs --- seed dormancy --- ABA --- seed germination --- chromosome segment substitution lines --- linkage mapping --- Oryza sativa L. --- chilling stress --- chlorophyll biosynthesis --- chloroplast biogenesis --- epidermal characteristics --- AAA-ATPase --- salicylic acid --- fatty acid --- Magnaporthe oryzae --- leaf senescence --- quantitative trait loci --- transcriptome analysis --- genetic --- epigenetic --- global methylation --- transgenic --- phenotype --- OsNAR2.1 --- dwarfism --- OsCYP96B4 --- metabolomics --- NMR --- qRT-PCR --- bHLH transcription factor --- lamina joint --- leaf angle --- long grain --- brassinosteroid signaling --- blast disease --- partial resistance --- pi21 --- haplotype --- high night temperature --- wet season --- dry season --- n/a

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This volume presents recent research achievements concerning the molecular genetic basis of agronomic traits in rice. Rice (Oryza sativa L.) is the most important food crop in the world, being a staple food for more than half of the world’s population. Recent improvements in living standards have increased the worldwide demand for high-yielding and high-quality rice cultivars. To achieve improved agricultural performance in rice, while overcoming the challenges presented by climate change, it is essential to understand the molecular basis of agronomically important traits. Recently developed techniques in molecular biology, especially in genomics and other related omics fields, can reveal the complex molecular mechanisms involved in the control of agronomic traits. As rice was the first crop genome to be sequenced, in 2004, molecular research tools for rice are well-established, and further molecular studies will enable the development of novel rice cultivars with superior agronomic performance.

chloroplast RNA splicing and ribosome maturation (CRM) domain --- intron splicing --- chloroplast development --- rice --- rice (Oryza sativa L.), grain size and weight --- Insertion/Deletion (InDel) markers --- multi-gene allele contributions --- genetic variation --- rice germplasm --- disease resistance --- microbe-associated molecular pattern (MAMP) --- Pyricularia oryzae (formerly Magnaporthe oryzae) --- Oryza sativa (rice) --- receptor-like cytoplasmic kinase (RLCK) --- reactive oxygen species (ROS) --- salinity --- osmotic stress --- combined stress --- GABA --- phenolic metabolism --- CIPKs genes --- shoot apical meristem --- transcriptomic analysis --- co-expression network --- tiller --- nitrogen rate --- rice (Oryza sativa L.) --- quantitative trait locus --- grain protein content --- single nucleotide polymorphism --- residual heterozygote --- rice (Oryza sativa) --- specific length amplified fragment sequencing --- Kjeldahl nitrogen determination --- near infrared reflectance spectroscopy --- heterosis --- yield components --- high-throughput sequence --- FW2.2-like gene --- tiller number --- grain yield --- CRISPR/Cas9 --- genome editing --- off-target effect --- heat stress --- transcriptome --- anther --- anthesis --- pyramiding --- bacterial blight --- marker-assisted selection --- foreground selection --- background selection --- japonica rice --- cold stress --- germinability --- high-density linkage map --- QTLs --- seed dormancy --- ABA --- seed germination --- chromosome segment substitution lines --- linkage mapping --- Oryza sativa L. --- chilling stress --- chlorophyll biosynthesis --- chloroplast biogenesis --- epidermal characteristics --- AAA-ATPase --- salicylic acid --- fatty acid --- Magnaporthe oryzae --- leaf senescence --- quantitative trait loci --- transcriptome analysis --- genetic --- epigenetic --- global methylation --- transgenic --- phenotype --- OsNAR2.1 --- dwarfism --- OsCYP96B4 --- metabolomics --- NMR --- qRT-PCR --- bHLH transcription factor --- lamina joint --- leaf angle --- long grain --- brassinosteroid signaling --- blast disease --- partial resistance --- pi21 --- haplotype --- high night temperature --- wet season --- dry season --- n/a

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Rice feeds more than half of the world population. Its small genome size and ease in transformation have made rice the model crop in plant physiology and genetics. Molecular as well as Mendelian, forward as well as reverse genetics collaborate with each other to expand rice genetics. The wild relatives of rice belonging to the genus Oryza are distributed in Asia, Africa, Latin America and Oceania. They are good sources for the study of domestication and adaptation. Rice was the first crop to have its entire genome sequenced. With the help of the reference genome of Nipponbare and the advent of the next generation sequencer, the study of the rice genome has been accelerated. The mining of DNA polymorphism has permitted map-based cloning, QTL (quantitative trait loci) analysis, and the production of many kinds of experimental lines, such as recombinant inbred lines, backcross inbred lines, and chromosomal segment substitution lines. Inter- and intraspecific hybridization among Oryza species has opened the door to various levels of reproductive barriers ranging from prezygotic to postzygotic. This Special Issue contains eleven papers on genetic studies of rice and its relatives utilizing the rich genetic resources and/or rich genome information described above.

Research & information: general --- Biology, life sciences --- African rice --- climate change --- genomic resources --- genetic potential --- genome sequencing --- domestication --- transcriptome and chloroplast --- anther length --- cell elongation --- genetic architecture --- outcrossing --- perennial species --- rice --- reproductive barrier --- segregation distortion --- abortion --- wild rice --- O. meridionalis --- O. sativa --- gene duplication --- Oryza sativa --- hybrid weakness --- cell death --- reactive oxygen species --- leaf yellowing --- SPAD --- hypersensitive response --- semidawarf gene --- d60 --- sd1 --- yield component --- phenotyping --- growth --- Seed shattering --- O. barthii --- HS1 --- haplotype --- rice (Oryza sativa) --- evolutionary relationships --- chloroplast genome --- nuclear genome --- phylogeny --- rice (Oryza sativa L.) --- brown planthopper --- near-isogenic lines --- pyramided lines --- resistance --- virulence --- flowering time --- photoperiod sensitivity --- allelic variation --- fine-tuning --- Oryza --- speciation --- divergence --- life history --- phylogenetic relation --- Australian continent --- abiotic stress --- salinity --- whole genome re-sequencing

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To meet the global food demand of an increasing population, food production has to be increased by 60% by 2050. The main production constraints, such as climate change, biotic stresses, abiotic stresses, soil nutrition deficiency problems, problematic soils, etc., have to be addressed on an urgent basis. More than 50% of human calories are from three major cereals: rice, wheat, and maize. The harnessing of genetic diversity by novel allele mining assisted by recent advances in biotechnological and bioinformatics tools will enhance the utilization of the hidden treasures in the gene bank. Technological advances in plant breeding will provide some solutions for the biofortification, stress resistance, yield potential, and quality improvement in staple crops. The elucidation of the genetic, physiological, and molecular basis of useful traits and the improvement of the improved donors containing multiple traits are key activities for variety development. High-throughput genotyping systems assisted by bioinformatics and data science provide efficient and easy tools for geneticists and breeders. Recently, new breeding techniques applied in some food crops have become game-changers in the global food crop market. With this background, we invited 18 eminent researchers working on food crops from across the world to contribute their high-quality original research manuscripts. The research studies covered modern food crop genetics and breeding.

Research & information: general --- Biology, life sciences --- Technology, engineering, agriculture --- dry direct-seeded rice --- early vigor --- QTL --- candidate gene --- phenotyping --- EMS --- MutMap --- mutagenesis --- CLE7 --- tropical maize --- fasciation --- mapping --- radish --- microspore culture --- regeneration rate --- outcrossing --- two-way pseudo-testcross model --- Oryza sativa L. --- PPDK --- flo4-5 --- floury endosperm --- rice --- allelopathy --- yield --- HYV --- Tongil --- indica --- japonica --- SNP --- molecular breeding --- wheat quality --- wheat milling --- wheat hardness --- puroindolines --- water absorption capacity --- crop genetics --- Solanum tuberosum --- abiotic stress --- phenylpropanoids --- essential amino acid --- transcriptome --- small RNA --- comparative genomics --- nutrition --- days to heading --- Hd1 --- Ghd7 --- Hd16 --- chromosome segment substitution lines (CSSLs) --- quantitative trait locus (QTL) --- marker-assisted selection (MAS) --- cold tolerance (CT) --- gene editing --- genetically modified --- genetically modified organism (GMO) --- crop breeding --- ribonucleoprotein complex (RNP) --- genetic screening --- landraces --- genetic diversity --- population structure --- West Africa --- maize improvement --- DArTseq markers --- co-expression network --- drought-tolerant-yield --- reproductive-stage drought --- qDTYs --- transcriptomics --- watermelon --- pentatricopeptide-repeat (PPR) gene family --- comprehensive analysis --- expression profiling --- flesh color --- canola --- Brassica napus --- genetics --- gene technology --- genomics --- disease resistance --- CSSLs --- drought stress --- ‘KDML105’ rice --- low-temperature germinability --- interspecific cross --- interaction --- peanut --- core collection --- genome-wide association study --- linkage disequilibrium

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Since the 1980s, agriculture and plant breeding have changed with the development of molecular marker technology. In recent decades, different types of molecular markers have been used for different purposes: mapping, marker-assisted selection, characterization of genetic resources, etc. These have produced effective genotyping, but the results have been costly and time-consuming due to the small number of markers that could be tested simultaneously. Recent advances in molecular marker technologies such as the development of high-throughput genotyping platforms, genotyping by sequencing, and the release of the genome sequences of major crop plants have opened new possibilities for advancing crop improvement. This Special Issue collects 16 research studies, including the application of molecular markers in 11 crop species, from the generation of linkage maps and diversity studies to the application of marker-assisted selection and genomic prediction.

Research & information: general --- Biology, life sciences --- durum wheat --- landraces --- marker-trait association --- root system architecture --- sugarcane --- parental line --- population structure --- plant breeding --- genetic diversity --- simple sequence repeats (SSR) --- Persea americana --- SMRT sequencing --- simple sequence repeat --- genetic relationship --- flavonoid biosynthesis --- fruit coloration --- marker-assisted selection --- microsatellites --- Rubus --- gene prioritization --- linkage disequilibrium --- tropical maize --- brown rice recovery --- milled rice recovery --- head rice recovery --- milling yield traits --- QTL mapping --- rice (Oryza sativa L.) --- tetraploid potato --- SNP markers --- SLAF-seq technology --- high-density genetic linkage map --- genome wide association study --- GWAS water use --- agronomic traits --- MTAs --- candidate genes --- TKW --- sedimentation volume --- SDS --- YR --- drought stress --- association mapping --- QTL hotspot --- seminal root --- gene pyramiding --- aroma --- QTL --- chromosome --- selection --- introgression line --- maize (Zea mays L.) --- Striga resistance/tolerance --- F2:3 biparental mapping --- Marker-assisted selection --- persimmon --- sex determination --- fruit astringency --- molecular markers --- genomics --- genomic selection --- genomic prediction --- whole genome regression --- grain quality --- near infra-red spectroscopy --- cereal crop --- sorghum --- multi-trait --- Triticum aestivum --- mapping population --- leaf rust --- stem rust --- pathogen races --- disease resistance --- apricot --- MAS --- breeding --- MATH --- PPV resistance --- agarose --- ParPMC --- ParPMC2-del --- high resolution melting --- ISBP markers --- drought --- MQTL --- wheat variability --- crop breeding --- genetic maps --- GWAS --- marker assisted selection --- DNA sequencing