Growth responses and adaptations of Fraxinus pennsylvanica seedlings to flooding
Flooding induced several physiological and morphological changes in Fraxinus pennsylvanica seedlings, with stomatal closure among the earliest responses. Subsequent changes included: reduction in dry weight increment of roots, stems, and leaves; formation of hypertrophied lenticles and production of adventitious roots on submerged portions of the stem above the soil line; leaf necrosis; and leaf abscission. After 15 days of stomatal closure as a results of flooding, stomata began to reopen progressively until stomata aperture was similar in flooded and unflooded plants. Adventitious roots began to form at about the time stomatal reopening began. As more adventitious roots formed, elongated, and branched, the stomata opened further. The formation of adventitious roots was in important adaptation for flooding tolerance as shown by the high efficiency of adventitious roots in absorption of water and in high correlation between the production of adventitious roots and stomatal reopening. 6 figures, 2 tables.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 6410848
- Journal Information:
- Plant Physiol.; (United States), Vol. 66
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
FLOODS
BIOLOGICAL EFFECTS
SEEDLINGS
BIOLOGICAL ADAPTATION
ABSORPTION
LEAVES
MORPHOLOGICAL CHANGES
PHYSIOLOGY
PLANT GROWTH
STOMATA
TOLERANCE
WATER
DISASTERS
GROWTH
HYDROGEN COMPOUNDS
OPENINGS
OXYGEN COMPOUNDS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
520100 - Environment
Aquatic- Basic Studies- (-1989)