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CDDM

China DNA-Fingerprint Database for Maize

Samples
205,209
Last Updated
March, 3, 2,026

Introduction

The China Maize DNA-fingerprint Database (CDDM) is the largest maize DNA-fingerprint database, containing 205,209 hybrid materials sourced from national and provincial regional trials and variety certification. All samples are authentic, reliable, and fully traceable. A unified marker system ensures accuracy, stability, and comparability of fingerprint data. The database consists of a core database built under stringent quality control and an extended database for comparing submitted samples against standard fingerprints. Key functional modules include: (1) Regional Trial Module; (2) Variety Certification Module; (3) Online Analysis Module. CDDM supports market supervision, seed certification, judicial authentication, and plant variety protection, helping to identify counterfeit varieties, enhance DUS testing efficiency, and provide molecular evidence for intellectual property enforcement. It plays a pivotal role in modernizing China’s seed industry.

Regional Trial Module

This platform provides statistical analysis of data from China's national maize variety regional trials, visually illustrating differences in allele frequencies across different ecological zones. It also includes comparisons of allele frequencies among different maize types in national trials, as well as variations in allele frequencies among maize samples from provincial trials, consortiums, and lv se tong dao trials. The platform offers breeding professionals data-driven support for precise breeding decisions, optimization of breeding objectives, and a scientific basis for the efficient utilization of germplasm resources.
Regional Trial Module - 1

Variety Certification Module

This interface displays information on China's certified maize varieties. You can select the year and choose different provinces (including nationally certified varieties) to observe the genotype frequency of certified varieties across different temporal and spatial dimensions.
Variety Certification Module - 1

Online Analysis Module

This interface first provides data analysis based on 2,714 important hybrid varieties that have been widely planted in China, incorporating the planted area into the calculation of allele frequencies and comparing it with unweighted allele frequencies. It also provides online analysis of high-density array data (Maize-6H60K) for 2,714 important hybrid varieties. The platform supports analyses including genome-wide distribution of heterozygous and homozygous loci, nucleotide diversity (Pi) analysis, and Fst analysis.
Online Analysis Module - 1

About Us

Technical Support

Beijing Maize Seed Testing Center, Software Development and Data Analysis Office
Room 108, seed building, Maize research center, Beijing academy of agricultural and forestry sciences, no.9 middle shuguang huayuan road, haidian district, Beijing
holibut@gmail.com, zhaoqiankaisteam@126.com
+86 13641332360, +86 18515166386, +86 13260316730, +86 18814512536

Development Teams

Maize Research Center, Beijing Academy of Agriculture & Forestry Sciences (BAAFS), Key Laboratory of Crop DNA Fingerprinting Innovation and Utilization (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs , Shuguang Garden Middle Road No. 9, Beijing 100097, China
Copyright © [2026] Beijing Maize Seed Testing Center, Maize Research Institute, Beijing Academy of Agriculture & Forestry Sciences (BAAFS). All Rights Reserved.