Background.
Hydrangea is an important ornamental plant and has numerous genetic resources. When evaluating the salinity tolerance of whole plants among numerous samples by pot trial assays, it incurs high management costs. In this study, we developed a simple-rapid assay for screening of salinity-tolerant hydrangeas that could help to reduce the number of plant samples.
Methodology.
We performed an assay using detached leaves that absorb salt water from the cut edge of their petioles.
Results.
This assay could detect differences in the necrotic degree of salinity-stressed leaves between different hydrangea species, cultivars, and wild populations of H. macrophylla. Also, the salinity tissue tolerance was reflected in the overall salinity tolerance of the whole plant.
Conclusions.
These results suggested that the assay is useful to select salinity-tolerant candidates among numerous genetic resources. However, several factors could affect necrosis in the salinity-stressed leaves in this assay, including sampling season and incubator climate conditions, so these factors need to be considered when comparing samples.
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