The current study was carried out in Constantine region of north-east Algeria, during four successive campaigns from 2012/2013 to 2015/2016 where climatic changes are recorded by warming or cooling months. The aim of our study is to observe the behavior of 15 fruit trees with climate respect, and to determine the effect of meteorological conditions on the phenological phase of flowering stage and on the yield. Our method was basedon selected field surveys of the flowering periods of the chosen

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... opulations and on the comparison of the phonological plant behavior against climatic changes. The obtained results showed that the species can be grouped according to the flowering period which is strongly related to photo-period and thermo-period.The results reveals a flowering precocity of 7.62 and 11.12 days on average marked respectively during the two agricultural years 2013/2014 and 2015/2016 and a double gametophytic phase produced toward the Eriobotrya japonica (Thunb.) Lindl. Early to bloom had adverse effects, especially the yield was completely wiped out as a result of reproductive exposure to spring frost. We concluded that the behavior or response of species to the same climatic changes is different from one year to the next, suggesting an acclimatization supported by a kind of plant memory and thus a genetic mechanism regulating the response to the climatic factors in order to ensure the survival of the species.