Canola seed germination and seedling initial growth under conditions of salinity

Silva, Vanessa Neumann; Talhafero, Joseani da Silveira

doi:10.15361/1984-5529.2014v42n3p265-270

Cited by 4 publications

(1 citation statement)

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“…In field conditions, germination timing may decrease due to many factors that are associated with seed, soil and environment properties (Derakhshan et al 2018; Vahabinia et al 2019; Liu et al 2020). Silva & Silveira (2014) reported that canola germination declined with increasing salinity and then completely stopped at 250 m m (AAP = 0), which is lower than that found in the present study. This decrease is often related to lower ψ and ion toxicity (Wu et al 2015).…”

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confidence: 93%

Halothermal and hydrothermal time models describe germination responses of canola seeds to ageing

Bakhshandeh

Jamali

2021

Plant Biol J

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Hydrothermal time (HTT) and halothermal time (HaloTT) models were used to quantitatively characterize the combined effects of temperature (T), water potential (ψ) and NaCl concentration on seed germination of canola after different accelerated ageing periods (AAP) at 42 °C and 100% humidity. Seed germination time courses were observed and electrical conductivities of seed leachates were measured in all experiments. The cardinal temperatures estimated by both models were 4.6, 28 and 35 °C for the base (Tb), optimum (To) and ceiling (Tc) temperatures in water (0 MPa), respectively, when the seeds were not aged. The Tb increased with AAP, while the Tc decreased and the To remained constant at all AAP. Below To, the median base water potentials (ψb(50)) were −1.07, −0.73, −0.48 and −0.39 MPa for the AAP levels of 0, 24, 36 and 48 h, respectively. These values were more negative when germination occurred in salt solutions (the base NaCl concentrations converted to ψ were −1.25, −0.81, −0.51 and −0.41 MPa, respectively), due to uptake of salt ions. Thresholds became more positive above To and reached zero at Tc in all AAP. Seed osmotic adjustment capacity declined linearly with increasing AAP while the conductivity of seed leachates increased in association with the loss of seed vigour. Significant correlations between conductivity results and the parameters of HTT and HaloTT models suggest that they could be considered as effective descriptors of canola seed vigour.

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