The effect of storekeeping in germination stage on seeds germination of 12 cultivars of spring rapeseed

摘要

An experiment was performed in 2005 in the seed laboratory of Tehran University to study the effect of Storekeeping during germination stage on seed germination characteristics of 12 cultivars of spring rapeseed. The experimental design used for this study was factorial in the form of randomized completed design with 4replication. Treatments were consisted of First factor in two levels: 1-germination in standard conditions (by standard test) 2-germination by accelerated aging test for restoration of conditions of stored seeds. Second factor was 12 cultivars of spring rapeseed. Germination in standard conditions was done at 25°C temperature. In the beginning, for performing accelerated aging test, dry seeds set at 41°C temperature and saturation humidity within a period of 3 days and then were transferred to 25°C temperature. In the basis of the results, the effect of first factor was significant on seedling dry weight, length of radicles, length of seedling, number of normal seedlings, seed vitality, seedling vigor index, at probability level of 0.001, and number of abnormal seedlings and hard seeds at probability level of 0.01,but it did not have significant effect on the length of plumules. Seedling which was grown under accelerated test had lower dry weight due to high respiration during the stages before main growth. Seed vigor, length of radicles, length of seedlings, number of normal seedlings, seedling and seed vigor index were higher during standard conditions. Number of abnormal seedlings and hard seeds were higher in the seeds under the accelerated test. It seems more number of the seeds that set under accelerated test, due to warm stress, went to obligatory dormancy, and produced more number of abnormal seedlings, too. Also second factor influenced on some characters such as seedling dry weight, seedling vigor index, length of radicles and plumules and seedling, seed vitality, seedling vigor, at probability level of 0.001 and Number of hard seeds at probability level of 0.05. RG405/02, HYOL308, and OPTION500 cultivars in consequence of seed weight were higher in the most characters such as seed vigor, seedling dry weight,number of normal seedlings, seedling vigor index. According to the interaction effect of treatments, the seeds with higher weight of thousand of seeds and lower oil percentage are more suitable for storekeeping and damage during the storekeeping time less.