The resource bank is the current effective and safe preservation method of crop germplasm. Preservation includes more than 10 processes. These involve receiving and registering seeds, checking weights, cleaning and selecting, vigour testing, drying and dehydration, moisture measurement and seed packaging before storage. Seed distribution, germination monitoring and reproduction update after delivery are also included.
"The temperature of the long-term repository is -18 C, and the seed preservation time is more than 50 years; the temperature of the medium-term repository is -4 C, which is mainly used for the distribution and utilization of germplasm resources; the temperature of the short-term repository is 4 C, which is used for short-term preservation of materials," says Dr Tang Xiao, a researcher at the resource bank. At the same time, the resource bank should regularly measure the germination rate of germplasm, and multiply when it is lower than 75 per cent to ensure the activity of the resource.
"These rice seeds were collected by my father Duan Chuanjia's generation of resource workers in the 1970s and kept in the warehouse in the 1990s. Now we have to take them out to check their traits and prepare for renewal and reproduction to maintain the vitality of the seeds," says Duan Yonghong, the person in charge of the resource bank.
At present, the resource bank has collected and preserved more than 30,000 germplasm resources from 59 countries and regions and 32 provinces (municipalities and autonomous regions) and has built the world's largest pepper germplasm resource bank, which has been distributed to 18 provinces. Nearly 30,000 copies of germplasm resources have completed the complementary exchange of advantages between Hunan and the national germplasm resources platform and supported the construction of the National Biological Seed Industry Technology Innovation Center, the National Center of Technology Innovation for Saline-Alkali Tolerant Rice, and strategic development of Hunan's seed industry.
Published : April 10, 2022
By : China Daily