Tackling crop lodging: new study unlocks genetic keys to stronger rapeseed stems
image: Lignocellulose biosynthesis model in stem.
Credit: Horticulture Research
Lodging, the bending and breaking of plant stems, is a primary threat to global rapeseed production, causing significant yield losses and complicating mechanical harvesting. With extreme weather events on the rise, fortifying crops against this threat has become a critical goal. Now, a new study has delved into the genetic and molecular underpinnings of stem strength in Brassica napus, offering a powerful roadmap for breeding next-generation, lodging-resistant varieties.
In modern agriculture, crop lodging is a major bottleneck for yield and efficiency, with rapeseed yields potentially dropping by up to 30% in severe cases. Stem strength, largely dictated by the composition of lignocellulose—a complex of lignin, cellulose, and hemicellulose—is the primary determinant of a plant's ability to stand firm against environmental stress. While these components are known to be key, the complex genetic networks governing their accumulation in stems have remained elusive. Due to these challenges, there is a pressing need for a systematic investigation to identify the specific genes and regulatory pathways that control lignocellulose synthesis in this vital crop.
A team of researchers from the Huazhong University of Science and Technology and the Chinese Academy of Agricultural Sciences published (DOI: 10.1093/hr/uhag201) their findings on August 19, 2026, in Horticulture Research. Their study used an integrated approach combining genetic mapping and transcriptomics to identify key genes controlling stem lignocellulose content, providing a foundation for molecular breeding of stronger, more resilient rapeseed varieties.
To uncover these mechanisms, the team analyzed a double haploid rapeseed population across multiple environments, identifying 61 consensus QTLs—genetic "signposts"—linked to the stem's lignocellulose content. By integrating this data with a comparative transcriptomic analysis of high- and low-lignocellulose lines, they identified 1,035 candidate genes. This narrowed the field to 52 high-confidence regulators, including transcription factors like MYB85 and WRKY12, which are known to orchestrate cell wall biosynthesis. Notably, they found BnaC03.ASMT, a gene whose expression is highly specific to the stem, and the protein product ASMT (acetylserotonin O-methyltransferase) might be associated with lignocellulose synthesis.
One of the most promising leads for breeders is the gene BnaC03.ASMT. Haplotype analysis in a natural population of 400 rapeseed lines revealed two primary variants for this gene. Crucially, the haplotype "hap01" was strongly correlated with a significantly higher hemicellulose content in the stem. Researchers then developed a pair of simple, co-dominant DNA markers, ASMT.F1/R and ASMT.F2/R, that can easily and rapidly distinguish between plants carrying the beneficial "hap01" variant and those with the less favorable one.
The authors said that the novel DNA markers they developed provide a practical and immediate tool for breeders to screen germplasm, enabling the swift selection and pyramiding of favorable alleles to develop elite lodging-resistant cultivars. They added that by linking specific gene variants to superior physical traits, this work not only clarifies the genetic regulation of stem strength but also translates directly into a strategy for improving crop resilience and productivity, which is essential as agriculture faces mounting challenges from climate change. Furthermore, the positive correlation they observed between lignocellulose content and multiple yield-related traits suggests that strengthening stems need not come at the cost of productivity, potentially offering a path to high-yielding, robust new varieties.
This research has significant implications for sustainable agriculture. By equipping breeders with precise genetic markers, it accelerates the development of rapeseed varieties that can withstand harsh weather, reducing crop losses and the risk of harvesting-related waste. Moreover, the findings on stem-specific gene expression suggest that breeders could fine-tune stem strength without affecting other agronomic traits, a pivotal strategy for developing high-yield and high-quality cultivars. Ultimately, this work provides a model for how advanced genetic insights can be translated into practical breeding tools to fortify a major global food crop.
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Refereneces
DOI
Original Source URL
https://doi.org/10.1093/hr/uhag201
Funding information
The paper acknowledges funding from the National Key Research and Development Program of China (2023YFD1201401, 2024YFD1200402), Zhejiang Provincial Science and Technology Key R&D Program (GG03208-1), the Central Public-interest Scientific Institution Basal Research Fund (Grant No. Y2025YC109), and the Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences (CAAS-ASTIP-2021-OCRI).
About Horticulture Research
Horticulture Research is an open access journal of Nanjing Agricultural University and ranked number one in the Horticulture category of the Journal Citation Reports ™ from Clarivate, 2023. The journal is committed to publishing original research articles, reviews, perspectives, comments, correspondence articles and letters to the editor related to all major horticultural plants and disciplines, including biotechnology, breeding, cellular and molecular biology, evolution, genetics, inter-species interactions, physiology, and the origination and domestication of crops.