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Differential response of Scots pine seedlings to variable intensity and ratio of red and far‐red light
Author(s) -
Razzak Abdur,
Ranade Sonali Sachin,
Strand Åsa,
GarcíaGil M. R.
Publication year - 2017
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12921
Subject(s) - scots pine , seedling , botany , hypocotyl , biology , light intensity , arabidopsis thaliana , elongation , far red , pigment , pinus <genus> , chlorophyll , shade avoidance , horticulture , red light , chemistry , gene , biochemistry , physics , organic chemistry , ultimate tensile strength , mutant , optics , metallurgy , materials science
We investigated the response to increasing intensity of red (R) and far‐R (FR) light and to a decrease in R:FR ratio in Pinus sylvestris L. (Scots pine) seedling. The results showed that FR high‐irradiance response for hypocotyl elongation may be present in Scots pine and that this response is enhanced by increasing light intensity. However, both hypocotyl inhibition and pigment accumulation were more strongly affected by the R light compared with FR light. This is in contrast to previous reports in Arabidopsis thaliana (L.) Heynh. In the angiosperm, A . thaliana R light shows an overall milder effect on inhibition of hypocotyl elongation and on pigment biosynthesis compared with FR suggesting conifers and angiosperms respond very differently to the different light regimes. Scots pine shade avoidance syndrome with longer hypocotyls, shorter cotyledons and lower chlorophyll content in response to shade conditions resembles the response observed in A . thaliana . However, anthocyanin accumulation increased with shade in Scots pine, which again differs from what is known in angiosperms. Overall, the response of seedling development and physiology to R and FR light in Scots pine indicates that the regulatory mechanism for light response may differ between gymnosperms and angiosperms.