关键词: 陆地棉; 种子活力; 人工老化; 低温胁迫

Abstract: 【Objective】 The resistance to storage of cotton seeds affects seed vigor. So this project aims to explore the effects of artificial aging and low temperature stress on seed germination of upland cotton, so as to provide support and seed resources for the study of resistance to low temperature and storage of upland cotton seeds.【Method】 With twelve upland cotton seeds as the materials, and through treatment with standard germination conditions, low-temperature stress and artificial aging, eight indexes including germination potential, germination rate, germination index, vigor index, seedling length, root length, fresh seedling weight and fresh root weight were recorded and analyzed.【Result】 The effects of different stress on seed vigor were different. The germination potential:artificial aging > standard > low temperature; The seedling length:standard > low temperature > artificial aging; The germination rate, root length and simplified vigor index:standard > artificial aging > low temperature; Simplified vigor index:standard > artificial aging > low temperature. When the similarity coefficient is 15, the standard germination can be classified into two types, high vigor and medium vigor. When the similarity coefficient was 20, cold stress could be divided into three types: cold tolerant type, intermediate type and cold sensitive type. The artificial aging treatment can be divided into three types when the similarity coefficient was15, which were storage type, intermediate type and non storage type. When the similarity coefficient of the three environments was 20, they can be divided into three types: low-temperature intolerance & storage type, intermediate type and low-temperature tolerance & non storage type.【Conclusion】 Treated with low temperature stress and artificial aging germination, such indexes as germination potential, germination rate, seedling length, root length and fresh root weight of upland cotton seeds decreased, except that fresh seedling weight and fresh root weight increased. Artificial aging treatment accelerated the seedling emergence rate, and reduced the final germination rate, making it easily form thick and strong seedlings. Low temperature stress not only reduced the seedling emergence rate and the germination rate, making it easily form short seedlings with small leaves and thick roots. Higher germination potential didn't necessarily result in higher germination rate, and vice versa. Seeds with high vigor under the standard state didn't have high vigor in adverse circumstances, and vice versa. In the materials used in this study, only Xinluzao 7 was highly resistant to low temperature but not resistant to storage. Materials with moderate resistance to low temperature and resistance to storage included Tashkent, Xinluzao 72 and 10615. Materials with resistance to storage and no resistance to low temperature included XND1586, KK1543, Zhongmian 49, Xinluzao 42 and Guannong 1.

Key words: upland cotton; cotton seed vigor; artificial aging; low-temperature stress