Germplasm Management

Germplasm management encompasses the systematic collection, preservation, characterisation and distribution of plant genetic resources to support breeding, conservation and research. Central to this endeavour are ex situ repositories such as seed banks, field genebanks, in vitro collections and cryopreserved samples, as well as complementary in situ and on-farm conservation of landraces and crop wild relatives. Key operations include passport data assembly, health testing, viability monitoring, seed drying and cold-storage protocols, periodic regeneration under controlled conditions, and rigorous record-keeping. Effective germplasm management underpins global food security by safeguarding allelic diversity for pest and disease resistance, abiotic stress tolerance and nutritional quality, while enabling equitable sharing via standard material transfer agreements and compliance with national and international treaties.

Research from Nature Portfolio

A novel “somatic genetic clock” has been devised to estimate the age of clonal genets by measuring fixed somatic mutations. Applied to cultivated eelgrass and globally sampled seagrass populations, this molecular clock reveals lifespans of up to 1 400 years and offers a tool for dating vegetatively propagated germplasm in long-term conservation collections.

High‐throughput genome sequencing of castor bean lines has produced 2 179 759 putative SNPs and enabled the design of a 6 000-locus genotyping array covering 87.5 % of the genome. Validation on 314 inbred lines yielded over 5 000 high-quality markers and supported construction of a consensus linkage map with a mean inter-marker distance of 0.55 cM, vastly improving the molecular characterisation of castor germplasm.

In bitter gourd, genotyping-by-sequencing of an F_2:3 population has assigned more than 2 000 SNP markers across 20 linkage groups and identified 19 QTLs for six major yield-related traits, with individual loci explaining up to 33 % of variance. This high-density linkage framework paves the way for marker-assisted selection of early-maturing, high-yielding cultivars.

Research from all publishers

A detailed genetic monitoring study of an endangered palm in ex situ collections revealed that standard propagation practices can lead to inadvertent self-fertilisation and erosion of diversity. By integrating molecular pedigrees with in vitro and garden plantings, optimised breeding pairings and the identification of mislabelled accessions were proposed to sustain allelic richness.

Combined morphological and EST-SSR marker analysis of 153 okra accessions derived from fruit-specific transcriptomes yielded 21 robust markers, two of which associate strongly with anthocyanin-linked colour variation. This approach demonstrates the utility of transcriptome-derived SSRs for rapid germplasm screening in minor vegetable crops.

An assessment of 36 okra genotypes in Ethiopia using 29 agromorphological and biochemical traits identified four diversity clusters, with principal components explaining over 82 % of variability. Cluster analysis highlighted nutrient-rich, high-yielding lines for use in breeding programmes aimed at improving both productivity and seed quality.

Germplasm Management publication trend

The graph below shows the total number of articles in germplasm management across all publications each year (not limited to Nature Index journals).

Technical terms

Germplasm: Living genetic material of plants—seeds, tissues or propagules—preserved for breeding, research and conservation.

Seed bank: An ex situ facility that stores dried seeds under controlled temperature and humidity for long-term conservation.

Single nucleotide polymorphism (SNP): A genomic marker based on a single base-pair variation, useful for high-resolution genotyping and linkage mapping.

Simple sequence repeat (SSR): A molecular marker comprising tandem DNA repeats, employed for diversity studies and cultivar identification.

Core collection: A representative subset of a larger germplasm assembly, selected to capture maximal genetic diversity with minimal redundancy.

Cryopreservation: Ultra-low-temperature storage (e.g. in liquid nitrogen) of plant tissues or embryos to maintain viability without genetic change.

References

1. A somatic genetic clock for clonal species. Nature Ecology & Evolution (2024).
2. Development and validation of an SNP genotyping array and construction of a high-density linkage map in castor. Scientific Reports (2019).
3. Genetic analysis and QTL mapping of yield and fruit traits in bitter gourd (Momordica charantia L.). Scientific Reports (2021).
4. Current management practices do not adequately safeguard endangered plant species in conservation collections. Biological Conservation (2023).
5. Development and Application of Fruit Color-Related Expressed Sequence Tag-Simple Sequence Repeat Markers in Abelmoschus esculentus on the Basis of Transcriptome Sequencing. Frontiers in Plant Science (2022).
6. Phenotypic Diversity Assessment of Okra (Abelmoschus Esculentus (L.) Moench) Genotypes in Ethiopia Using Multivariate Analysis. Scientifica (2022).
7. Genetic Diversity, Conservation, and Utilization of Plant Genetic Resources. Genes (2023).