Effects of some plant growth regulators on physiological quality of Bromus aged seeds

Document Type : Research Paper

Authors

1 University of Tehran, Department of Agronomy and Plant Breeding

2 Research Institute of Forests and Rangelands, P.O. Box: 13185-116, Tehran, Iran

Abstract

The recovery of physiological quality of Bromus (Bromus inermis L.) aged seeds was evaluated, using cytokinin, auxin and gibberellin with 25, 50 and 100 ppm concentrations. Percentage of germination, rate of germination, length of radicle and plumule, seedling length and vigor index were decreased significantly by ageing. Auxin at 25 and 100 ppm increased germination percentage of aged seeds. All of plant growth regulators at same concentration showed different effects on germination percentage. Type of plant growth regulators had no significant effect on rate of germination, but increase in concentration of plant growth regulators, significantly decreased germination rate. Seed ageing inhibited growth of radicle more than plumula ones. Radicle seems to be one of susceptible structures to ageing in seed. Auxin somewhat recovered radicle growth of aged seed. Type of plant growth regulator did not affect radicle length, but plumule growth was promoted by cytokinin and gibberellin. In spit of decreasing Root/Shoot ratio in aged seeds, ageing had no significant effect on it, however, auxin increased this ratio in both aged and non-aged seeds. R/S decreased with increase in plant growth regulator concentration: Frequency of abnormal seedlings decreased by aging but dead seeds increased.

Keywords

References

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