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L. SHI, M. CLINE, Shoot Inversion-induced Ethylene Production in the Diageotropica Tomato Mutant, Annals of Botany, Volume 69, Issue 2, February 1992, Pages 119–122, https://doi.org/10.1093/oxfordjournals.aob.a088316
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Abstract
Shoot inversion was found to inhibit shoot elongation over 24 h in the diageotropica (dgt) mutant tomato and its isogenic parent, VNF8, by 55% and 51%, respectively. Previous studies with normal tomato and other species would suggest that gravity stress-induced ethylene production in the inverted shoot retards elongation. Since exposure of the diageotropic shoot of the dgt mutant tomato to ethylene restores normal upward growth, it might appear that dgt is defective in its capacity to produce ethylene. That shoot inversion did stimulate some ethylene production and that the ethylene action inhibitor, AgNO3, largely negated the inhibiting effect of shoot inversion on elongation in dgt strongly suggest that the ethylene produced in the inverted shoot was responsible for its retardation of growth. Although ethylene production in the slower growing dgt was much less than that in the faster-growing VNF8, the dgt shoot was found to be much more sensitive to ethylene.
