The influence of temperatures on germination and seedling growth of pyrethrum (Tanacetum cineraiifolium) under drought stress

Abstract

Pyrethrum is a perennial daisy grown commercially for the insecticide that is extracted from its flowers. In order to evaluate germination and seedling growth of pyrethrum under different temperature and drought stress treatments, the one year experiment was conducted in seed technology laboratory of Faculty of Agriculture of Islamic Azad University of Isfahan branch in 2018. During this experiment, polyethylene glycol (PEG) at 6 levels (0, -0.2, -0.4, -0.6, -0.8, -1.0 MP) and two temperature treatments (10 o C and 15 o C) were used. Two separate factorial trials, on the basis of absolute randomized design with three replications were used. Drought stress impact on germination percentage, mean time germination, shoot and root length, abnormal germination, germination uniformity, plumule dry and fresh weight, root dry and fresh weight and seed stamina index was significant (P≤0.01). The influence of temperature on germination percentage, mean time germination, shoot and root length, plumule dry weight, plumule fresh weight, root dry weight and root fresh weight was significant (P≤0.05).The rate of germination, germination percentage, as well as seedling growth and establishment were significantly lowered with the rise of stress levels using PEG. Control treatment and 15 o C had obtained the highest germination percentage, mean time germination, shoot and root length, germination uniformity, plumule dry and fresh weight, root dry and fresh weight, and seed stamina index. Taking all traits into account, a clear understanding of the germination responses of seeds is useful in screening for tolerance of species to extreme temperatures.

Induction of regulatory mechanisms by plant growth promoting rhizobacteria in crops facing drought stress

“…2019). Germination percentage and seedling growth decrease with increasing stress level (drought) in Tanacetum cinerariifolium (Shahrajabian et al . 2020).…”

“…Germination and seedling vigour of Glycine max are affected by water stress, and these effects can be transmitted to the next generation (F 1 ) (Wijewardana et al 2019). Germination percentage and seedling growth decrease with increasing stress level (drought) in Tanacetum cinerariifolium (Shahrajabian et al 2020). Islam et al (2018 tested 100 genotypes of Oryza sativa under five levels of drought stress and observed that drought stress decreased germination by 6.6-95.8% with each increasing stress level.…”