Search bioRxiv⌕ Search
Home/Archive/bioRxiv

bioRxiv · 10.1101/2025.06.30.662399

Investigations into genetic control of six spike traits with a focus on breeding for terminal heat stress tolerance in common wheat

Kumar, S.·Singh, V. P.·Sharma, H.·Rawale, K. S.·Bhatt, S. K.·Vairamani, R.·Gill, K. S.·Balyan, H. S.
View original source ↗Export metadata ↓

Abstract

To unravel the genetic architecture of six spike traits under heat stress, we used a doubled-haploid (DH) population (177 lines), developed from a cross between a heat-sensitive cultivar (PBW343) and a heat-tolerant genotype (KSG1203). This DH population and the two parents were phenotyped under timely, late, and very late sown conditions across 15 environments over three years and two locations. Best linear unbiased estimates and a high-density genetic map (5,710 SNP markers) were used for QTL mapping. A total of 51 QTL were detected in timely (17), late (10), and very late (18) sown conditions, with six common across environments with phenotypic variation explained ranging from 7.1% to 23.6%. A set of 14 stable, major QTL were validated in high-yielding DH lines and are recommended for marker-assisted recurrent selection. Several QTL co-localized with known genes responsible for important traits including grain yield (TaGW2-B1, PI1-1B). Seventy heat-responsive candidate genes associated with QTL were identified, encoding 33 proteins. A KASP marker for floret fertility QTL (QFf.ccsu-3A), and gene-based SSR markers for five key genes were developed and validated alongside Indels and SNPs. The generated genomic resources could be used in future studies and to breed heat-tolerant, high-yielding wheat varieties and germplasm. HighlightIdentified and validated stable QTL for spike traits across 15 environments, promising candidate genes for thermotolerance and spike traits, novel KASP and gene-based markers, providing genomic resources for breeding high-yielding, heat-tolerant wheat. Graphical Abstract O_FIG O_LINKSMALLFIG WIDTH=153 HEIGHT=200 SRC="FIGDIR/small/662399v1_ufig1.gif" ALT="Figure 1"> View larger version (67K): org.highwire.dtl.DTLVardef@1e3cc33org.highwire.dtl.DTLVardef@734b17org.highwire.dtl.DTLVardef@146e3a5org.highwire.dtl.DTLVardef@10b9fbc_HPS_FORMAT_FIGEXP M_FIG C_FIG

Source connections

Explore related subjects

geneticsPreprint

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Kumar, S., Singh, V. P., Sharma, H., Rawale, K. S., Bhatt, S. K., Vairamani, R., Gill, K. S., Balyan, H. S.. 2025-07-04. Investigations into genetic control of six spike traits with a focus on breeding for terminal heat stress tolerance in common wheat. https://doi.org/10.1101/2025.06.30.662399

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related preprints

bioRxiv2026

Generation of a transgenic cephalopod

Coleoid cephalopods (cuttlefish, octopus, and squid) are marine mollusks with elaborate nervous systems that support a diverse repertoire of complex behaviors. These include the neural control of the color, pattern, and texture of the skin, facilitating both adaptive camouflage and innate patterning that may reflect internal state. The development of transgenic cephalopods expressing fluorescent proteins, optogenetic actuators, and reporters of neural activity would contribute a new and important technology to cephalopod biology. The generation of transgenic cephalopods, however, has remained a major challenge. Here, we report the development of stable transgenic dwarf cuttlefish (Ascarosepion bandense) expressing ubiquitous nuclear-localized mScarlet, a red fluorescent protein. We evaluated multiple strategies for transgenesis, and established cuttlefish lines using both CRISPR and the transposons Sleeping Beauty and Minos. The stable expression of transgenes enabled live imaging of cell dynamics during embryonic development. The Minos transposon emerged as the most efficient transgenesis strategy and is adaptable to promoters and transgenes of choice. These strategies now enable the generation of diverse genetic tools for mechanistic studies of cephalopod biology.

genetics↗
bioRxiv2026

Large language model-based bibliometric evaluation of population descriptors in human genetics

As the use of population descriptors such as race, ethnicity, and ancestry have become increasingly common in modern genetics research, there have been growing calls to critically examine their use. Most notably, in 2023, the National Academies of Science, Engineering, and Medicine (NASEM) published a report titled Using Population Descriptors in Genetics and Genomics Research: A New Framework for an Evolving Field, which included eight specific and actionable recommendations for researchers to implement the ethical and accurate use of population descriptors in genetic research. Here, we use the 2023 NASEM report as a benchmark to analyze the use of population descriptors in genome-wide association studies (GWAS). We develop a general toolkit for large language model-based bibliometrics, operationalize the report's recommendations into an evaluation framework, and apply this framework to evaluate all 4,007 papers from the GWAS Catalog published between 2007 and 2025 with full text available on PubMedCentral. We find significant improvements in adherence to NASEM report recommendations over time. However, most improvements predate the publication of the NASEM report itself, suggesting the report functioned primarily as a synthesis of existing best practices rather than a catalyst for change. We conclude by highlighting opportunities for growth in the field of human genetics.

genetics↗
bioRxiv2026

Mitigating biases of rescaling in forward-in-time population genetic simulations

Forward-in-time population genetic simulations are widely used in evolutionary analyses, but simulating large populations and long genomic regions remains computationally demanding. To reduce this cost, parameter rescaling is widely employed, in which the original evolutionary process is approximated by one with a smaller population size and fewer generations. Recently, several studies using the SLiM simulator have raised concerns about the accuracy of this rescaling approach. In this study, we show that many of the biases reported in these studies can be mitigated by using a different simulation algorithm. These results reveal that the accuracy of parameter rescaling depends on how well the simulation algorithm preserves diffusion-limit properties under rescaling.

genetics↗