Handbook of Plant and Crop Physiology

engineered plants, which overproduce auxin, cytokinin, and/or ethylene, have also been developed. Us-
ing a molecular biological approach, investigators have provided support to the classical Cholodny—
Went theory of differential growth elicited by tropistic responses. Similarly, transgenic plants have been
used to support the theory that the auxin/cytokinin ratio, not the auxin-stimulated ethylene, controls the
process of correlative growth (apical dominance, compensatory growth). Thus, studies using advanced
technologies have supported theories advanced many years ago with the response techniques developed
earlier. It is therefore encouraging that use of such mutants and/or transgenic plants is generating infor-
mation on the biochemical and cellular processes that modulate plant growth and development [162].

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522 NAQVI