02428naa a2200385 a 450000100080000000500110000800800410001910000210006024501340008126000090021552014220022465000090164665000130165565000120166865000160168065000160169665000150171265000150172765000100174265000090175265000100176165000100177165000210178165000160180265300130181865300210183165300220185265300160187465300190189065300210190965300130193065300100194370000210195377300680197411308322019-07-01       1995    bl ---       0--  u    #d1 aNUNEZ-ELISEA, R.  aEffect of leaf age duration of cool temperature treatment and photoperiod on bud dormancy release and floral initiation in mango.  c1995  aFloral induction in apical buds of container-grown "Tommy Atkins" mango trees occurred after a cool temperature regime of 18grausC day/10grausC night, 12-h photoperiod, was imposed for a minimum period of 3 weeks on trees bearing leaves at least 7 weeks old. Growth of induced buds during exposure to the cool temperature regime appeared to be necessary for floral initiation, since buds resuming growth in warm temperatures (about 28grausC day/22grausC night) immediately after receiving an inductive, cool temperature treatment produced a vegetative flush. Trees bearing younger leaves or chemically forced (thidiazuron or ammonium nitrate application) to resume growth prior to completing 3 weeks of cool temperature treatment also produced vegetative growth insteadof inflorescences. Cool temperatures of 18grausC day/10grausC night with either 11-, 12-, 13-, or 24-h photoperiods resulted in floral initiation, whereas only vegetative growth occurred with warm temperatures of 30grausC/25grausC night using 11- or 13-h photoperiod. Results of this study suggest that floral induction of "Tommy Atkins" mango occurred during bud dormancy in cool temperatures around 15grausC, and that warm temperatures near 30grausC prevented floral initiation of inducedbuds. Cool temperatures rather than a short photoperiod caused floral induction, whereas warm temperatures rather than a long photoperiod inhibited flowering.  abuds  adormancy  amangoes  aphotoperiod  atemperature  aDormência  aFloração  aFolha  aGema  aIdade  aManga  aMangifera Indica  aTemperatura  aDomencia  aFloral induction  aFloral initiation  aFotoperiodo  aInducao floral  aIniciacao floral  aLeaf age  aMango1 aDAVENPORT, T. L.  tScientia Horticulturae, Amsterdamgv. 62, n.1/2, p.63-73, 1995.