Rooting ability of Persian walnut as affected by seedling vigour in response to stool layering

Vahdati, Kourosh; Rezaee, Ramin; Grigoorian, V.; Valizadeh, Mostafa; Azar, Alireza Motallebi

doi:10.1080/14620316.2008.11512388

Cited by 11 publications

(13 citation statements)

References 17 publications

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“…Variability between genotypes in rooting was also reported in other woody plants like peach (Tsipouridis et al, 2003), and grapevine (Peros et al, 1998). Results appear that rooting ability of low-vigor seedlings by stool layering is better than in semi-vigorous and highvigorous seedlings (Vahdati et al, 2008). The number of seedlings which showed rooting ability in the low vigor seedlings was approximately 2.5-times greater than in the high vigor seedlings.…”

Section: Rooting Abilitysupporting

confidence: 56%

“…Walnut is known as a "difficult-to-root" genus among fruit trees. Vahdati et al (2008) confirmed that there is variability between walnut populations in rooting ability. Variability between genotypes in rooting was also reported in other woody plants like peach (Tsipouridis et al, 2003), and grapevine (Peros et al, 1998).…”

Section: Rooting Abilitymentioning

confidence: 52%

“…Dwarf genotypes of walnut may have a higher proportion of homozygous loci that are responsible for reduced vigor of growth, which consequently produce a higher proportion of dwarf offspring. Vahdati et al (2008) reported that there are endogenous hormonal and histological differences between high vigor and low vigor seedlings in walnut. Rezaee et al (2006) calculate correlation between some morphological traits among walnut populations.…”

Section: Introductionmentioning

confidence: 99%

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Early bearing genotypes of walnut: a suitable material for breeding and high density orchards

Vahdati¹,

Mohseniazar²

2016

Acta Hortic.

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Walnut (Juglans regia) is a non-precocious bearing and vigorous tree. Standard seedlings of walnut have long juvenility and are hard to propagate by usual propagation methods like cutting, layering and somehow grafting. There is an excellent genetic diversity among Juglans regia populations from China to central and west Asia including Iran. Among the populations there are some genotypes of walnut that are precocious and have short juvenility phase. These genotypes usually have cluster bearing flowering habit, low vigor and good rooting ability that make them suitable for easy propagation by cutting and stool layering. Most of these genotypes have basitonic phenotype in nature. Such dwarf genotypes which have ability to induce precocity in scion can be used not only as a rootstock in walnut breeding programs to shorten the vegetative adult phase of the scion and reduce duration and costs of a breeding program, but also have potential for establishing high density orchards. Precocity trait also has a high heritability in walnut. Low vigor genotypes show the highest proliferation rate and smaller shoot size, lower callus formation and higher rooting percentage in vitro. Moreover, these genotypes showed in vitro flowering on microshoots. Therefore, these genotypes of walnut are an ideal material for molecular genetic investigations for breeders and geneticists to find the genes involved in precocity, growth, flowering habit, easy rooting and other valuable traits in walnut. In this article we review the researches done about these genotypes.

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Section: Rooting Abilitysupporting

confidence: 56%

Section: Rooting Abilitymentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

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Early bearing genotypes of walnut: a suitable material for breeding and high density orchards

Vahdati¹,

Mohseniazar²

2016

Acta Hortic.

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“…Petridou and Voyiatzis [ 40 ] reported that the rooting rate of the difficult-to-root cultivar Kalamon of Olea europaea reached 86% when harvested softwood cuttings were subjected to mound-layering. Upon such treatment, the rooting rate of 3-year-old walnut seedlings can attain 40% [ 49 ]. In the present study, we showed that a combination of grafting and burying of stock plants horizontally effectively improve ARF of mature walnut plants, the rooting rate of soft shoot cuttings reached 98.2% (Fig.…”

Section: Discussionmentioning

confidence: 99%

A novel rejuvenation approach to induce endohormones and improve rhizogenesis in mature Juglans tree

et al. 2018

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BackgroundJuglans is a difficult-to-root tree. In the present study, we successfully rejuvenated stock plants by grafting and then burying them horizontally.ResultsRooting rates of rejuvenated shoots were 98.1% 20 days after cutting. We recorded spatial and temporal variation in endogenous indole-3-acetic acid (IAA), abscisic acid (ABA), gibberellin A3 (GA3) and zeatin-riboside (ZR) under root induction. The four types of endohormones were mainly confined to the phloem sieve and companion cells (S&Cs) at the base of either rejuvenated or mature soft shoots. IAA and ABA levels were higher in rejuvenated shoots than in mature shoots, whereas the opposite was true for GA3 and ZR. During rooting induction, GA3 was the first hormone to be observed outside phloem S&Cs, followed by IAA, ABA and ZR. In rejuvenating soft shoots, IAA accumulated in the cross-sectional areas of the cambium and phloem, where root primordia were evident.ConclusionsThe improvement in the rooting ability that was evident after rejuvenation most likely results a transformation of the plant to a juvenile form, from elevated IAA levels in phloem S&Cs and from a promotion of all four endohormones outside phloem S&Cs, in particular, from an accumulation of IAA in the cross-sectional areas of the cambium and phloem.Electronic supplementary materialThe online version of this article (10.1186/s13007-018-0280-0) contains supplementary material, which is available to authorized users.

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“…Dwarf and semi-dwarf walnut forms are found in Central Asia [29]. These forms are also characterized by such a valuable feature as increased rooting ability with vertical layering [31].…”

Section: Walnut Traits Valuable For Breeding In the South Of Russiamentioning

confidence: 99%

Management of walnut genetic resources to improve the efficiency of the breeding process in the South of Russia

Balapanov

Artykhova

2021

E3S Web Conf.

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Walnut is one of the main nut crops of world importance. Conservation and efficient use of genetic resources is one of the fundamental principles of breeding work. The most efficient way to work with genetic resources is to create core collections that include most of the genetic diversity with the least number of samples in the collection. There are several different approaches to the creation of core collections, differing in the criteria for the selection of characters and the number of samples in the collection. This article provides an overview of the most effective approaches to creating walnut core collections in southern Russia. Of course, both genetic and phenotypic diversity should be taken into account. Microsatellite markers or SNPs may be the most appropriate tools for assessing genetic diversity, depending on the objectives and sample sizes. The article also provides an overview of the most valuable traits from the point of view of walnut breeding in the North Caucasus.

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Rooting ability of Persian walnut as affected by seedling vigour in response to stool layering

Cited by 11 publications

References 17 publications

Early bearing genotypes of walnut: a suitable material for breeding and high density orchards

Early bearing genotypes of walnut: a suitable material for breeding and high density orchards

A novel rejuvenation approach to induce endohormones and improve rhizogenesis in mature Juglans tree

Management of walnut genetic resources to improve the efficiency of the breeding process in the South of Russia

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