Document Type : Original Article

Authors

1 MSc student of Plant Breeding, Department of Agronomy & Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.

2 Assistant Professor of Department of Agronomy & Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.

3 Associate Professor, Department of Plant Production, College of Agriculture and Natural Resources, Gonbad Kavous University, Iran.

Abstract

Introduction
 One of the most important variables for establishment of the appropriate rice seedling under stress environments is high power of the germination and emergence. In this regard was conducted a research to study of genetic variation in aerobic rice and Iranian genotypes on the base of tolerance to drought stress.
Material and methods
Seed germination test was conducted in three levels of osmotic stress (distilled water, -8 and -16 bar of manitol) and 52 rice genotypes as a split plot in a randomized complete block design with three replications. Genotypes consisted of 31 genotypes of the aerobic rice and foreign as well as 21 Iranian varieties of rice.
Results
The results showed that there were significant difference between osmotic stress levels, genotype and interaction between the levels of osmotic stress and genotypes for whole germination components. Considering all of above condition, the highest ranks in the overall comparison to Arunachalam method were belonged to genotypes aerobic and foreign named AE8, AE6, AE18, AE16 and AE29 and lowest ranks were for Iranian genotypes named Ghasroldashty, RashtiSard, Anbarbou, AliKazemi, Champabodar, Hashemi and DomSiah.
Conclusions
According to these results, foreign and aerobic genotypes showed relative superiority more than Iranian rice on the base of the characteristics of germination and with increasing levels of drought stress; foreign and aerobic genotypes were more tolerant.

Keywords

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