التغيرات البيوكيميائية لثمار خمسة أصناف من نخيل التمر Phoenix dactylifera L.

الملخص EN

The present study was carried out in a private orchard in Abu – Alkhaseeb region –Basrah , during the growing season of 2011 , to study some of physiological changes during growth and development of the date palm ( phoenix dactylifera L.

) cv.(Khadrawi, Hillawi, sayer, Am Al -dhen, Mektom).

Result showed had a significant in considered, sucrose concentration of fruit increased continuous to reach its highest values at khala stage, then event by gradual decrease during rutab and tamer stages.

The total soluble solids of reducing sugars and total sugars concentration and there was a gradual increase reached a peak value at the tamer.

Fruits of Sayer recorded the highest value in the percentage of reducing , total sugars and total soluble solids 55% , 57%, 62% respectively to tamer stage while Am Al- dhen recorded the highest value of reducing sugars and percentage dry matter 22% , 52% respectively to rutab stage .

Values of moisture content compounds of fruits were high at Kimri stage, then decreased as the fruits advanced toward the stages of Khalal, Rutab and Tamer, , whereas the reverse was true for changes in percentage dry matter, the results showed total acidity decreased during growth and development stage.

Changes in respiration rate production in both cultivars was typical of that which characterize climacteric fruits ,