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Salinity inhibits plant growth by reducing photosynthesis and leaf expansion. The main factor that inhibits plant growth under salinity stress differs among studies. In the present study, we focused on far-red light (FR) as a factor that interacts with salinity. We investigated the effects of salinity on growth analysis parameters of
Cucumis sativus
seedlings under light containing FR (FR+) or light without FR (FR–). Interactions between FR and salinity influenced plant growth: the growth inhibition under salinity stress was smaller under FR − than under FR+. Growth analysis showed that the main limiting factor for plant growth under salinity stress was the net assimilation rate (
NAR
) under FR+, but was the leaf area ratio (
LAR
) under FR–.
NAR
was not significantly decreased by salinity under FR–, probably because of improved tolerance of osmotic stress due to an increased proportion of active phytochrome. On the other hand,
LAR
was decreased by salinity only under FR–. This is probably because salinity did not increase the photosynthate allocation to leaves, which could have compensated for the decreased specific leaf area caused by salinity, because photosynthate allocation to the stem was limited under FR–. Our results indicate that the proportion of FR in light sources, which probably affects stress tolerance and the photosynthate allocation, should be considered when investigating the factors that cause growth inhibition under salinity stress.