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MORPHOGENETIC RESPONSES OF EPICOTYL HOOK, PRIMARY LEAVES AND FIRST INTERNODE OF CITRUS SEEDLINGS TO IRRADTANCE *
Author(s) -
Monselise S. P.,
KadmanZahavi Avishag
Publication year - 1965
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1965.tb09772.x
Subject(s) - epicotyl , biology , botany , germination , far red , horticulture , hook , darkness , red light , structural engineering , engineering
— Dark germinated citrus seeds produce a characteristic epicotyl hook which opens in white light. The effects of white, red and far red irradiation, in different combinations on the opening of hooks, the increase in length of primary leaves and the reduction in length of epicotyl have been studied. Broadly speaking, morphogenetic effects of light are similar to those usual for annual plants. One single red cycle coming after a long period of intermittent far red seems to be more effective than coming after a long period of darkness. It is also at least as effective as a long period of intermittent red irradiance. These features are of interest and deserve further study. Elongation of leaves and opening of hooks are correlated when treatment means are considered, but not in individual seedlings, possibly indicating independence of these two effects of radiation.