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SOME EFFECTS OF TEMPERATURE AND PHOTOPERIOD ON GROWTH AND FLORAL DEVELOPMENT IN THREE WINTER ANNUALS
Author(s) -
CLARK S. C.
Publication year - 1969
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1969.tb06513.x
Subject(s) - vernalization , biology , inflorescence , photoperiodism , botany , day length , horticulture
S ummary An experiment on the effects of temperature and day length on the vegetative and reproductive growth of populations of the winter annuals, Catapodium rigidum, Erophila verna and Saxifraga tridactylites from the west of Ireland, is described. The results are used to show the potentialities of subjecting plants at different stages of development to the same treatments, as a method of assessing the role of environmental factors under natural conditions. Catapodium rigidum was found to have an absolute vernalization requirement and long days were required for suhsequent development of inflorescences up to the flowering stage. Short days given after inflorescences had begun to develop resulted in the formation of secondary tillers at the extremities of primary tillers (‘mops’) and proliferations. Any vernalization requirement of Erophila verna and Saxifraga tridactylites was satisfied by mid‐November. The development of flower buds in winter was more rapid in Erophila verna than in Saxifraga tridactylites . Day length did not effect the number of flower buds produced by either species but they differed in their ability to mature fruits in short days.