BY520-9, A Peach Rootstock for the Southeastern United States that Increases Scion Longevity

Okie, W.R.; Beckman, T.G.; Nyczepir, A. P.; Reighard, G.L.; Newall, W.; Zehr, E. I.

doi:10.21273/hortsci.29.6.705

Cited by 46 publications

(30 citation statements)

References 3 publications

(4 reference statements)

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“…Thirty-Wve percent emergence was typical of 'Guardian' peach rootstock when it was Wrst introduced commercially as a bulked seedlot. But given the importance of Peach Tree Short Life tolerance provided to peach trees propagated on 'Guardian' (Okie et al 1994), speciWc selections were identiWed that increased the emergence of 'Guardian' in the rootstock bed to 60-70%. While seedling emergence exhibited by two of the three advanced generation PEAL hybrids did not diVer signiWcantly from that of the rootstock standard 'Nemaguard,' alternative seed treatments for these hybrids may increase emergence.…”

Section: Resultsmentioning

confidence: 99%

Advanced generation peach-almond hybrids as seedling rootstocks for almond: first year growth and potential pollenizers for hybrid seed production

Ledbetter

Sisterson

2007

Euphytica

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For decades, seedling peaches have been used as the standard rootstock in California almond orchards. Vigorous, deep rooted trees are needed in almond orchards for maximum yields and to withstand the annual tree-shaking at harvest. Currently, researchers are actively evaluating rootstocks for almonds in Weld trials and in various screening protocols. In this study, seedling rootstocks, obtained from male-sterile advanced generation peach-almond (PEAL) hybrid mother trees, were compared with 'Nemaguard' peach seedlings for emergence in the nursery row, trunk caliper at propagation time, and end of season dormant above ground tree weight. Seedling emergence was aVected signiWcantly (P · 0.05) by seed source, as was trunk caliper and end of season dormant above ground tree weight. Trunk caliper and dormant above ground tree weight were also aVected signiWcantly (P · 0.05) by planting year. Results obtained in this study demonstrate the enhanced Wrst year growth from seedlings of advanced generation PEAL hybrids, as compared to 'Nemaguard' seedlings. Seedling emergence in the rootstock bed was not aVected signiWcantly by planting year. Advanced generation PEAL hybrid seedlings were ready for June-budding at an earlier date compared to 'Nemaguard' seedlings, providing the potential for larger-sized Wnished nursery stock by the end of the growing season. Due to the male-sterile status of the advanced generation PEAL mother trees, bloom periods of several root-knot nematode resistant rootstock cultivars were examined for their degree of synchronicity with the mother trees. The examined rootstocks and mother trees varied in both chill hour and post-chill heat requirements necessary to eVect bloom. 'Flordaguard' peach rootstock began bloom in advance of the male-sterile mother trees, whereas the bloom period of 'Tsukuba No. 4' occurred well after, suggesting they would not be eVective synchronous pollenizers for consistent hybrid seed production. Based on more limited Xowering period data, better bloom synchronicity was achieved with a Tsukuba No. 4 X Flordaguard hybrid.

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Section: Resultsmentioning

confidence: 99%

Advanced generation peach-almond hybrids as seedling rootstocks for almond: first year growth and potential pollenizers for hybrid seed production

Ledbetter

Sisterson

2007

Euphytica

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“…In 1994, the peach rootstock Guardian R Brand BY520-9 (Figure 1), which is tolerant to M. xenoplax, was released (Okie et al, 1994) as a bulked seed source for use as a commercial rootstock for peach and nectarine. It consists of open-pollinated (OP) seed from selected seedlings from genotype BY594520-9 that can be traced several OP generations back to the parental genotypes, S-37 and Nemaguard (Okie et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

“…It consists of open-pollinated (OP) seed from selected seedlings from genotype BY594520-9 that can be traced several OP generations back to the parental genotypes, S-37 and Nemaguard (Okie et al, 1994). Although, the ring nematode is able to successfully feed and reproduce on Guardian R Figure 1.…”

Section: Discussionmentioning

confidence: 99%

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Simple Sequence Repeat Markers for Detecting Sources of Tolerance to PTSL Syndrome in Prunus Persica Rootstocks

et al. 2006

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Peach tree short life (PTSL) is a severe and complex disease syndrome in the Southeast of the United States that causes significant damage to peach orchards and affects more than 70% of the peach acreage in the region. The ring nematode is known to be one of the major factors strongly associated with the PTSL syndrome. A peach rootstock (Guardian R Brand BY520-9, also referred to as Guardian R or BY520-9), which is tolerant to ring nematode and PTSL, was released in 1994. To investigate the genetic relatedness of PTSL tolerant genotypes and identify possible parents of Guardian R selections as sources of the PTSL tolerance trait, 98 genotypes derived from the BY520-9 pedigree, and others showing different degrees of field resistance or susceptibility to PTSL, were selected for simple sequence repeat analysis. Nineteen of 32 microsatellite loci were polymorphic. Allele number averaged 2.7 per locus with heterozygosity levels ranging from 0.07 to 0.60. Cluster analysis of these genotypes produced a dendrogram in agreement with their putative pedigrees. Thirty-eight F 4 genotypes from Guardian pedigree were used for the parental identification analyses. Of those, nine most likely parental genotypes were identified for 10 field tested F 5 genotypes produced from open-pollinated selections of BY520-9.

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“…Guardian® 'BY520-9' has been released as a bulked seedlot for industry use as a rootstock for peach and nectarine. It consists of openpollinated seeds of approximately five selections that trace several open-pollinated generations back to the PTSLsusceptible peach rootstocks S-37 and Nemaguard (Okie et al 1994). A Guardian® open-pollinated selection 3-17-7 is being used as a core genotype in the Guardian® 'BY520-9' bulked seedlot and exhibits superior survival on PTSLinfected sites compared with other Guardian® selections (Reighard, unpublished).…”

Section: Methodsmentioning

confidence: 99%

Construction of a genetic linkage map and identification of molecular markers in peach rootstocks for response to peach tree short life syndrome

Blenda

Verde

Georgi

et al. 2007

Tree Genetics & Genomes

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BY520-9, A Peach Rootstock for the Southeastern United States that Increases Scion Longevity

Cited by 46 publications

References 3 publications

Advanced generation peach-almond hybrids as seedling rootstocks for almond: first year growth and potential pollenizers for hybrid seed production

Advanced generation peach-almond hybrids as seedling rootstocks for almond: first year growth and potential pollenizers for hybrid seed production

Simple Sequence Repeat Markers for Detecting Sources of Tolerance to PTSL Syndrome in Prunus Persica Rootstocks

Construction of a genetic linkage map and identification of molecular markers in peach rootstocks for response to peach tree short life syndrome

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