Analysis of morpho-physiological diversity of some tunisian date palm pollinators and study of their whorl pollen grain on fruit set, the time of ripening and yield of date palm cv. deglet nour

Author: 
Kadri karim, Baba Wiem, Golem Zobayda, Makhlouf Souhaila and Barrani Halima

In Tunisia, the date palm is characterized by considerable genetic richness represented by 250 cultivars. It represents the backbone of the agricultural activity in the south west of the country. In this work we have done in the first step a study of morpho-physiological diversity of 10 date palm pollinator selected and on second step the effect of pollen on to maturity and fruit quality of the variety ‘Deglet Nour ‘.the principal component analysis (PCA) using the R software allowed to choose two axes: axis 1 (F1) and the axis2 (F2) that absorbed a maximum of existing variability between pollinators date palm studied (48.80%). Their values are 28.79% and 20.01% respectively. The result showed that only 16 characters from 51 traits tested, can be used as a discriminative character .So pollinators showed a significant discrepancy between them, with a similarity index ranging from 0.174 to 0.764 that can be grouped into 4 groups. For the metaxenic effect of pollinators on the date of ripening and fruit quality, The analysis of the effect of different pollinators of fruit ripening has identified three groups: Pollinators hastening fruit ripening: P121 and P45 Pollinators retarding fruit ripening: P invitro and Pollinators have an effect on unstable maturation: remaining pollinators, the obtained result showed that the P121 and is the better pollinator because it promotes the maturation and gives a good caliber. The maximum fruit yield was scored with P Invitro.

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