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Resumption of cellular activity induced by cytokinin and gibberellin treatments in tomato flowers targeted for abortion in unfavorable light conditions
Author(s) -
Kinet JeanMarie,
Zune Véronique,
Linotte Colette,
Jacqmard Annie,
Bernier Georges
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb01214.x
Subject(s) - gibberellin , inflorescence , cytokinin , ovule , mitosis , biology , botany , lycopersicon , horticulture , microbiology and biotechnology , auxin , embryo , biochemistry , gene
Mitotic activity and nuclear DNA synthesis in tomato ( Lycopersicon esculentum Mill., cv. King plus) flowers targeted for abortion under unfavorable light conditions are completely stopped 6 days after macroscopic appearance of the inflorescence. Ovular cells are arrested at the G 1 (80%) and G 2 (20%) stages of the cell cycle. Exogenous applications of a mixture of N 6 ‐benzyladenine (BA) and gibberellins A 4+7 (GA) directly on the inflorescence may prevent its failure. Nuclear DNA synthesis and mitoses resume in ovules of the flower 16 to 20 h after the BA+GA treatment. When applied alone, BA and GA are able to mimic the effect of the mixture upon the progression of ovular cells through their cycle. Sporogenesis processes are also set in motion by the exogenous plant growth regulators. The mechanism of action of cytokinins and gibberellins in the control of floral development is discussed.