Development of lenticels and adventitious roots in flooded ulmus americana seedlings
Angeles, G.; Evert, R.F.; Kozlowski, T.T.
Canadian Journal of Forest Research 16(3): 585-590
Flooding of soil for 31 days reduced growth, induced marginal leaf necrosis and abscission, caused decay of root systems, and induced morphological and anatomical changes in 10-week-old Ulmus americana L. seedlings The seedlings adapted to flooding by forming hypertrophied lenticels and adventitious roots on submerged portions of stems, as well as forming new roots on preexisting roots. Hypertrophy of the lenticels resulting from accelerated phellogen activity and elongation of cork cells. The increased phellogen activity extened beyond the lenticels and often resulted in ruptures of the epidermis encircling the entire stem circumference. The flood-induced adventitious roots on stems originated de novo in the ray parenchyma of the secondary phloem.