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Apricot is an important crop in Italy and, especially in Southern regions, in the last five years numerous plantings using new cultivars and appropriate cultural management have been established. The cultivars available were created in different environments (USA, France, New Zealand, etc), they then often show low adaptability to Italian conditions. However, in the South of Italy, it is still possible to safeguard and to exploit a considerable amount of the apricot genetic variation available in ecotypes often characterised both by useful bio-agronomic traits and by good environmental adaptation. These genetic materials could be used in breeding programs aimed at broadening the harvest period and obtaining high fruit quality and resistance to the main biotic and abiotic stresses.
Self-incompatibility is common in apricot (Prunus armeniaca L.) cultivars of Central Asian and Irano-Caucasian ecogeographical groups, while cultivars of European group are traditionally considered as self-compatible. However, the number of known self-incompatible cultivars of the European group has increased rapidly over the last two decades. This can be explained by using Asian or North American self-incompatible cultivars in breeding programs that aim to create new genotypes with the traits including: Plum Pox Virus resistance, frost tolerance, increase of the sugar content or extending the harvest time. In this work self-(in)compatibility was tested in 38 apricot cultivars. Pollentube growth in pistils pollinated in laboratory was analysed using fluorescence microscopy. Cultivars were considered self-compatible if at least one pollen tube reached the ovary in the majority of pistils. In self-incompatible cultivars growth of pollen tubes in the style of pistil stopped along with formation of characteristic swellings. Of the examined cultivars, 17 were self-compatible, and 21 were self-incompatible.
In the field experiment, 5-year-old 'Morden 604' and 'Miodowa' apricot trees grafted on the seedling rootstocks Wangenheim Prune and Erunosid (both P. domestica L.), as well as Polish selection apricot (P. armeniaca L.) geno­types A4 and M46 were compared with trees of the same cultivars on the standard P. divaricata rootstock. Vigour in apricot trees was affected by rootstock type. Trees of both cultivars on P. divaricata and 'M46' had the largest trunk cross-sectional area. The most dwarfing rootstock was 'Wangenheim Prune'. Rootstock had no effect on the fruiting of 'Morden 604' trees. In the case of the Miodowa cultivar, the highest cumulative yields were harvested from trees grafted on P. divaricata and 'M46', while the lowest from those on 'Erunosid'. The results revealed that 'Wangenheim Prune', in compari­son to other rootstock tested, significantly reduced the mean fruit weight. In addition, trees grafted on this rootstock had the highest mortality. Mean content of soluble solids in fruits of 'Morden 604' and 'Miodowa' apricots was not affected by root- stocks in this study. Generally, the value of A4 and M46 genotypes used as seedling rootstocks for apricot trees in this experiment was higher than the P. divaricata stan­dard rootstock.
Fruit apricot dimensions, weight, size and shape are the most commonly measured pomological properties. The size and shape features of 13 apricot (Prunus armeniaca L.) cultivars and promising Serbian selections grown in Western Serbia were investigated using a multivariate analysis. The apricots promoted fruits wider than long in shape, except ‘Harcot’, ‘T 7’, ‘Précoce de Tyrinthe’, ‘Roksana’ and ‘Vera’, whereas all cultivars and selections are wider than thick. Most of cultivars and/or selections tend to round shape. Mean values for fruit and stone weight, flesh rate, geometric mean diameter, kernel weight, sphericity, aspect ratio, surface area and volume ranged from 37.09 to 81.60 g, 2.71 to 4.18 g, 91.93 to 96.46%, 41.76 to 65.08 mm, 0.60 to 1.17 g, 0.94 to 1.03, 95.04 to 108.09%, 55.13 to 133.77 cm2 and 38.31 to 145.10 cm3 , respectively. For the most of attributes evaluated, ‘Roksana’ had the highest values. A high correlation was found among some physical attributes. According to their 22 properties, the apricots grouped into five clusters. There was either relative independence or close correspondence among the evaluation indexes of apricot fruit quality. Principal components analysis showed that the first three principal components variance accumulation contribution rate amounted to 85.77%, which reflected most of the size and shape characteristics of apricots.
It has been well known that some fungal pathogens (Monilia laxa, M. fructigena, Cytospora cincta), larvae of Grapholita molesta and plant hormone - ethylene, induce gummosis in apricot shoots. Methyl jasmonate (JA-Me) was also found to induce gummosis in apricot shoots as well as biotic and abiotic factors mentioned above. In order to know the mode of action of JA-Me on gum induction and/or formation, chemical composition of polysaccharides (after hydrolysis) in gums of apricot shoots induced by JA-Me compared with those by ethephon and their mixture, and naturally occurring ones was studied, resulted in the succesful identification of monosaccharides, and the similarity of a composition consisting of xylose, arabinose and galactose at molar ratio 1 : 10 : 14, respectively. These results suggest that beside different inducers of gum in apricot the mechanism of polysaccharides biosynthesis of gums is the same or similar. The physiological role for JA-Me on gum induction and/or formation in apricot shoots, and other species are also discussed.
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Rosaceae fruit trees are characterized by gametophytic self-incompatibility, with their production typically requiring artificial pollination or pollination tree is required in production. Both of these solutions cause reductions in production efficiency, and self-incompatibility has become a major issue in agricultural biology, and as such, has been extensively studied. In this review, we discuss the relationship between S-RNase content in the style and self-incompatibility, and the role of the SLF gene in stamen-determining factor. Considering mutations in self-compatibility-related genes and self-compatibility in polyploid fruit trees, we discuss the potential mechanisms of self-incompatibility. Based on a preliminary study of the role of pollen tube Ca2+ gradients in self-incompatibility in Pyrus, we propose a new mechanistic model of self-incompatibility taking into account the effect of Ca2+. We also discuss the potential for hormone regulation to be used to control selfincompatibility in Rosaceae fruit trees.
This study was conducted in Malatya, between 1999 and 2003, and the region's most important dried apricot variety, Hacihaliloglu was used as material. In the study, the effect of 5 different combined or alone pruning treatments on the growth, fruit quality and yield characteristics were determined in comparison with non-pruned trees. Pruning treatments in different periods did not statistically affect phenological features and fruit dimensions but strongly affected total soluble solid and fruit firmness of Hacihaliloglu apricot cultivar. The highest average yield considering trunk cross-sectional area was obtained as 0.34 kg·cm-2 from pre-harvest summer pruning treatment and the highest share of flower bud was observed as 68.29% in pre-harvest summer+winter pruning treatment. Pruning applications significantly affected both shoot diameter and length. The highest shoot diameter and length were obtained from pre-harvest summer+winter pruning application as 8.52 mm and 77.84 cm, respectively. The highest leaf area was determined as 39.43 cm2 in post harvest pruning treatment.
The main objective of the research was to evaluate the ability to set fruit in new apricot clones developed at the Research Institute of Pomology and Floricultur e in Skierniewice, Poland, pollinated with different apricot cultivars. The experiments were conducted in the field of the Experimental Orchard in D ą browice (2008 and 2010) and in a high plastic tunnel in the Pomological Orchard in Skierniewice (2010). A high degree of self - incompatibility was found among the five clones investigated; however, all of them were compatible with the apricot cultivars us ed as pollinators. A good pollinating cultivar for the tested clones was ‘Early Orange’
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