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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology


Study of the Floral Phenology and Inflorescence Characteristics of Selections of Olive obtained by Controlled Pollination in Relation to Climatic Conditions

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Author Ibtissem Laaribi, Mouna Aļachi Mezghani, Messaoud Mars
ISSN 2225-7217
On Pages 793-797
Volume No. 3
Issue No. 8
Issue Date September 01, 2013
Publishing Date September 01, 2013
Keywords Olive tree seedlings, self-and free-pollination, phonology, inflorescence characteristics.



Abstract

A breeding program has been developed since 1994 (done by Dr A. Trigui), by controlled pollinations of the Tunisian olive oil variety Chemlali Sfax in order to improve the qualities of this variety (higher oil percentage and a better chemical composition). These controlled pollinations have produced a population of new genotypes presented a wide genetic diversity which was very interesting for choice of future selections. The study was undertaken to obtain further information on morphological characters of inflorescence and phonological stages on some new olive selections obtained through self and free pollination of Chemlali Sfax. The impact of climatic conditions on the initiation date and the duration of bud break and full bloom was also investigated. Morphological characteristics of inflorescences showed a comparative variability between descendants within both type of pollination confirmed by higher variation coefficients (CV>20%) and significant differences (p=0.001). Inflorescence length varied from 11.14 to 30.36 mm. Number of flowers per inflorescence was between 7.11 and 21.53. Percentage of perfect flowers ranged from 31% to 95%. Variability was also observed among olive descendants within crossings on the timing of phonological phase. Full bloom took place on average from April 3rd to May 15th. The period between formation of floral clusters and fruit set was 35-63 days long. A general anticipation of bud break and full bloom according the rainfall was noted. Thus, the present preliminary contribution on morphophenological study of Chemlali olive descendants provides information on potential and behavior of new genotypes with promising performances. Further investigation of floral biology, including other traits as the compatibility and fruit set will be carried out.


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