Effect of hydropriming duration and temperature on the seed and seedling characteristics of rainfed wheat (Kouhdasht Var.) under drought stress conditions

Document Type : Research Paper

Authors

Agrotechnology Department, Lorestan University

Abstract

Low soil moisture content is one of the major problems in arid and semi-arid regions that leads to weak and nonsynchronous seedling emergence and establishment, finally resulting in the yield lose. Seed hydropriming mitigates these adverse drought effects. Therefore, in this study, the effective factors in seed hydropriming such as time and temperature are evaluated on the physiological quality of seed and seedling of a rainfed wheat (Kouhdasht var.) under drought stress. A pot experiment was carried out as factorial with three replications on the base of the RCBD under drought stress conditions in Lorestan University. Drought levels were 25, 50 and 75% field capacity. Hydropriming time and temperature levels were 12, 18, 24 h and 15, 20, 25°C, respectively. Percent and speed of seedling emergence, seedling growth rate, leaf area index, chlorophyll index and the number of root branches were measured. Results showed that most of the traits decreased as drought increased. Also, hydropriming temperature affected emergence percent and speed, seedling growth rate and chlorophyll index. Maximum of these traits were obtained when the seed primed at 25◦C. Interaction of drought and hydropriming period was significant for seedling emergence percentage. There was an interaction between priming temperature and priming period for LAI. Seed priming for 12 h was the best for increasing seedling emergence at mild drought stress. But there was no difference between priming times at sever stress. Seed hydropriming of this cultivar for 12 hours at 20 or 25 ◦C is suggested to achieve the best germination and seedling emergence speed.

Keywords

References

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Iranian Journal of Seed Sciences and Research
Volume 4, Issue 4
February 2018
Pages 23-36

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