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Control of Adventitious Root Production and Hypocotyl Hypertrophy of Sunflower ( Helianthus annuus ) in Response to Flooding
Author(s) -
WAMPLE R. L.,
REID D. M.
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb01636.x
Subject(s) - hypocotyl , helianthus annuus , aerenchyma , shoot , sunflower , biology , plant stem , chlorosis , botany , flooding (psychology) , apical dominance , horticulture , psychology , psychotherapist
The morphological changes of the shoots of Helianthus annuus cv. Russian caused by varying periods of flooding of the roots were studied. Attention was focused on adventitious root formation and hypocotyl hypertrophy which are known to be caused by excess water around the roots in the absence of anoxia. Twenty‐four hours of flooding was found to be sufficient to cause both of these responses. Experiments involving flooding, leaf removal, shoot apical bud removal, two different light intensities, and a treatment in which only a small proportion of the roots were flooded suggested that a major factor causing the flood‐induced changes in the hypocotyl arises in the root but other factors may come from the leaves. In the longer‐term experiments other flood‐induced changes in shoot morphology were leaf epinasty, death of shoot apex, extreme chlorosis and hypertrophy of nodes and internodes. There was no apparent contribution of adventitious roots to the survival of flooded plants.