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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (2): 154-163.DOI: 10.11686/cyxb2023136

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Effects of seed storage time on seed germination and cytological structure of covered oats and naked oats

Rui-rui YAO1(), Huan LIU1(), Gui-qin ZHAO1, Jing-long WANG2, Qi-yu WANG1, Kai DONG1, Ran ZHANG1   

  1. 1.Key Laboratory of Grassland Ecosystem,Ministry of Education,Pratacultural College,Gansu Agricultural University,Lanzhou 730070,China
    2.Institute of Pratacultural Science,Tibet Academy of Agriculture and Animal Husbandry Sciences,Lhasa 850000,China
  • Received:2023-04-26 Revised:2023-05-12 Online:2024-02-20 Published:2023-12-12
  • Contact: Huan LIU

Abstract:

This research investigated the effects of seed storage time on the germination characteristics and cell organization structure of the covered oat variety ‘Longyan No. 3’and the naked oat variety ‘Baiyan No. 2’. The changes in germination index, viability index, shoot length, root length and electrical conductivity of two different oat germplasm lines after storage for 2, 4, 6 and 8 years were studied. Paraffin sectioning methods and transmission electron microscopy were used to observe and compare the changes with time and varietal differences in covered and naked oat seed anatomical structure, seed embryonic cell organization and mitochondrial ultrastructure and changes with storage time. It was found that with increase in storage time, the germination index, seed viability index and vitality of both oat germplasm lines decreased, while the electrical conductivity of seeds increased. The seed viability of ‘Longyan No. 3’ was more stable than that of ‘Baiyan No. 2’. The anatomical structure of aged oat seeds changed, and the cells of the paste layer were hydrolyzed, the ultrastructure of embryo cells and mitochondria in aged oat seeds was seriously damaged. The main changes observed were that the fat bodies in seed embryo cells were degraded; The structure of mitochondria was damaged, vacuolated and disintegrated. The nucleus structure was unclear and the chromatin was concentrated, nucleoli had disappeared, and nuclear edges were wrinkled.

Key words: storage time, seed vitality, anatomical structures, ultrastructure