Regulation by auxin and ethylene of responses of Acer negundo seedlings to flooding of soil

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Abstract

Flooding of soil reduced growth, altered stem anatomy and stimulated ethylene production of Acer negundo L. seedlings. Inhibition of basipetal auxin transport in flooded seedlings by application of NPA (1-N-naphthylphthalamic acid) to stems reduced formation of adventitious roots, width of the xylem increment and the number of vessels in the submerged stem, but had little effect on bark growth. Application of NAA (naphthalene acetic acid) below the height of NPA application restimulated production of adventitious roots and increased vessel numbers, but had little effect on bark thickness or xylem increment. Apically produced auxins appeared to have a predominant role in formation of adventitious roots and vessels, and a lesser role in regulating bark growth and xylem increment. Ethylene appeared to have a major role in regulating leaf epinasty, senescence and abscission as well as production of hypertrophied lenticels and growth of bark tissues.

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