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Hypocotyl growth in Sinapis alba L: the roles of light quality and quantity
Author(s) -
HOLMES M. G.,
BEGGS C. J.,
JABBEN M.,
SCHÄFER E.
Publication year - 1982
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 - 10.1111/1365-3040.ep11587590
Subject(s) - sinapis , hypocotyl , photostationary state , phytochrome , elongation , photomorphogenesis , botany , fluence , biology , red light , irradiation , physics , materials science , arabidopsis , photoisomerization , biochemistry , isomerization , ultimate tensile strength , gene , mutant , metallurgy , brassica , catalysis , nuclear physics
. A comparison is made of the relative effectiveness of light quality and light quantity on the elongation growth of Sinapis alba hypocotyls. The results show that hypocotyl extension rate in plants which have not previously been exposed to light is controlled primarily by the prevailing photon fluence rate when the phytochrome photostationary state lies between ∼0.033 and ∼0.81. Below ∼0.033, changes in photostationary state also have a marked effect on extension rate. Elongation growth in light‐adapted plants is controlled by both photon fluence rate and the spectral quality of the incident radiation at all photoequilibria. Photosynthesis can modify these responses but is not essential as a prior condition for a green plant to respond to changes in light quality and quantity.