SOME PROMISING WALNUT SELECTIONS (Juglans regia L.)

Yarilgaç, Tarık; Koyuncu, F.; Koyuncu, Mehmet Ali; Kazankaya, Ahmet; Sen, S.M.

doi:10.17660/actahortic.2001.544.10

Cited by 40 publications

(25 citation statements)

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“…The highest value for nut weight among our evaluated trees (15.2 g) was less than the corresponding data reported by Sen & Tekintas (1992) for Adilcevaz, Turkey (23.81 g); Atefi (1997) for Kamal Abad walnut collection orchard, Iran (20.9 g); Sharma & Sharma (1998) Sen & Tekintas (1992), Atefi (1997), Kazankaya et al (2001), Sharma & Sharma (2001), Yarilgac et al (2001), Acka & ozungun (2004), Zeneli et al (2004), and Aslantas (2006). In breeding programmes, genotypes with a kernel ratio higher than 48-50% are more desirable (Germain 1997;Korac et al 1997).…”

Section: Phenological and Flowering Traitscontrasting

confidence: 64%

“…Walnut genotype evaluation has previously been conducted in many countries throughout the world (Sen & Tekintas 1992;Nicese et al 1998;Sharma & Sharma 1998,2001Kazankaya et al 2001;Yarilgac et al 2001;Solar & Stampar 2003;Acka & ozungun 2004;Asadian & Pieber 2005;Zenli et al 2005). In Iran, the first extensive studies were initiated by Atefi in 1984(Atefi 1993.…”

Section: Introductionmentioning

confidence: 99%

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Morphological variation among Persian walnut (Juglans regia) genotypes from central Iran

Arzani¹,

Mansouri‐Ardakan

Vezvaei

et al. 2008

New Zealand Journal of Crop and Horticultural Science

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Fifty-eight mature Persian walnut (Juglans regia) seedlings growing at six sites in the mountainous regions of Taft, in central Iran, were evaluated to determine their morphological variation and to identify promising individuals. The traits investigated included phenological characteristics, such as budbreak and nut maturity time, and nut characteristics, such as nut and kernel weight, kernel ratio, and shell thickness. Yield efficiency and fruitbearing habit were also investigated. The average fruit characteristics: nut weight, kernel weight, kernel ratio, and shell thickness were in the range of 6.0-15.2 g, 2.6-9.1 g, 38.4-79.6%, and 0.4-1.4 mm, respectively. The promising genotypes were AA 33 thickness (0.67), kernel weight (0.75), and shell thickness (0.32); whereas a negative correlation was detected between shell thickness and kernel ratio (-0.34). The data correlation matrix was subjected to principal component analysis, a technique that reduced the dimensionality of the data set and revealed the dominating variables. Cluster analysis of the selected genotypes detected three cluster groups. However, no significant relationship was found between morphological diversity and site geography. The promising selected genotypes identified in central Iran will be further exploited by walnut breeding programmes for their tree and nut characteristics.

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Section: Phenological and Flowering Traitscontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Morphological variation among Persian walnut (Juglans regia) genotypes from central Iran

Arzani¹,

Mansouri‐Ardakan

Vezvaei

et al. 2008

New Zealand Journal of Crop and Horticultural Science

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“…Superior genotypes were selected for yield, nut characteristics, and cold tolerance (Aslantaş 2006) and other promising trees were selected for late flowering and walnut blight and anthracnose tolerance (Yarilgac et al 2001;Asma 2012;Fikret Balta et al 2007;Karadag and Akça 2011). In Albania, evaluation of pomological and phenological traits of germplasm from the Dibra region found high variability in nut weight (Zeneli et al 2005).…”

Section: Morphological Studies As Preliminary Breeding Approachesmentioning

confidence: 99%

Walnut: past and future of genetic improvement

Bernard

Lheureux²,

Dirlewanger

2017

Tree Genetics & Genomes

163

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Persian or English walnut (Juglans regia L.), the walnut species cultivated for nut production, is one of the oldest food sources known. Persian walnuts, native to the mountain valleys of Central Asia, are grown worldwide in temperate areas. World production exceeds three million tons since 2012, mostly provided by China, the USA, and Iran. Despite very ancient culture of walnut species (Juglans spp.), breeding actually started in the twentieth century. Using a range of methodologies, from morphological markers to the most recent advances in genome analysis, many genetic studies of walnut have been conducted during the past 30 years, including examination of diversity, determination of relationships within or among germplasm collections and populations, phylogenetic and origin elucidation, genetic map construction, and biotic or abiotic stress investigations. The genetic improvement of walnut has undergone great evolution. The producing countries of the Middle East have widely studied morphological characteristics of walnut. The USA and France, for example, are behind important cultivar releases such as BChandler^and BFranquette.^Finally, genomics represents a major breakthrough in walnut improvement, in particular by recent sequencing of both chloroplast and nuclear genomes. This review summarizes worldwide molecular and Bomics^studies and gives an overview of the main walnut breeding programs.

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“…Initially, the goals of walnut breeding efforts were blight resistance and anthracnose tolerance, high-quality fruit and large yields. Other studies have bred for the morphological features that include nut weight, nut length, kernel weight, kernel percentage, shell thickness, kernel colour, kernel fullness, late leafing, and lateral fruitfulness (Olez, 1971;Şen 1983;Celebioglu et al 1988;Yarılgaç et al 2001;Akca and Ozongun 2004;Balta et al 2007). However, studies are also needed to describe the nutritional value of selected varieties.…”

Section: Introductionmentioning

confidence: 99%