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Olive cultivation plays animportant role in the economy of many countries which most of them belong tothe Mediterranean region. In Egypt, the latest statistics of the Ministry ofAgriculture in 2015 sited that the total acreage grown with olive Cvs. reachedabout 227683 feddans with production about 698927 ton.

The efficiency of the olive industry greatly depends on harvestingeconomic fruit yields that can be used for producing oil and table olives(Taslimpour and Aslmoshtaghi, 2013). Olive fruits used for oil extraction andpickling. The oil proportion in the fruit, ranged from 35 to 70% on dry weightbasis (El-Hady et al. 2007).The olive (Olea europaea L.) flowers are either perfect(hermaphrodite) or staminate (male). The proportion of perfect and staminateflowers is genetically determined but also depends on climatic conditions andthe level of fruit production in the previous year (Lavee et al.

2002);therefore, it may vary from year to year, tree to tree, shoot to shoot andinflorescence to inflorescence (Fabbri et al. 2004 and Martin & Sibbett2005).Self-incompatibility is a genetically controlled mechanism that preventsself-fertilization in plants. Most olive cultivars are self-incompatible orpartially self-compatible and need to be fertilized by compatible pollinizersto ensure acceptable production (Moutier 2002; Fabbri et al.

, 2004 and Conner& Fereres 2005). Furthermore, some cultivars are cross-incompatible andcannot fertilize each other (Cuevas & Polito 1997). The degree of self-incompatibility in olive is widely influenced by genetic factors andenvironmental conditions (Lavee et al. 2002). As a result, Self-incompatibility obliges olive growers to plant morethan one cultivar in their orchards to ensure sufficient cross-pollination(Martin et al., 2005 and Mookerjee et al., 2005). Cross-pollination canenhance fertilization as shown by reports of higher fruit set and results inmore regular yields even for partially self-fertile cultivars (Cuevas et al.

,2001 and Breton and Bervillé, 2012)Some researchers also determined that the use of appropriate pollinatorcultivar even in self- fertile cultivars had a positive effect on yield. (Ferrara et al., 2002).

In addition, several studies revealed that the use ofpollinator cultivars increased fruit set and emphasized that having pollinatorcultivars was necessary for orchard establishment (Lombardo et al., 2006;Vulletin Selak et al., 2006; Farinelli et al., 2008 and Mete et al., 2012).Therefore, the objective of this investigation was to recognize the best pollinizer for olive cultivars and theireffect on fruit set and quality attributesof some olive cultivars.

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