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THE FUNCTION OF PHYTOCHROME IN THE NATURAL ENVIRONMENT—IV. LIGHT QUALITY AND PLANT DEVELOPMENT
Author(s) -
Holmes M. G.,
Smith Harry
Publication year - 1977
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.1751-1097.1977.tb09127.x
Subject(s) - phytochrome , cucurbita pepo , biology , plant growth , red light , shading , chenopodium , botany , greening , function (biology) , weed , ecology , microbiology and biotechnology , art , visual arts
— Studies of the effect of light quality on the growth of Cucurbita pepo L . and Chenopodium album L . showed that large changes in morphological development can be induced by altering the proportion of red and far‐red in the incident radiation. Although phytochrome photoequilibria established at the beginning of the dark period affected development, similar changes were achieved with long term and continuous irradiation. The change in the growth pattern of C. album (a common weed species in cultivated land) caused by simulated wheat canopy shade, appeared to involve a redirection of growth towards processes which would achieve greater height at the expense of lateral growth. The evidence presented supports the hypothesis that phytochrome may be involved in the detection of mutual shading and the modification of development in an appropriate manner.