Rest termination and prediction models for low chilling blueberries and nectarines /

Gilreath, Phyllis R.

doi:10.5962/bhl.title.119727

Cited by 27 publications

(43 citation statements)

References 8 publications

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“…After CR evaluation based on the < 7.2°C model had been completed, CR of each genotype was recalculated based on the 0-7.2°C model (Eggert, 1951), the Utah model (Richardson et al, 1974), the Low Chill model (Gilreath & Buchanan, 1981) and the Dynamic model (Fishman et al, 1987;Erez et al, 1988 Richardson et al (1975). GDHs for a specific genotype were determined by subtracting 4.5°C (below which no growth or development of peach buds occurs) from the hourly temperature, and accumulating the balance from the time of CR completion to full bloom.…”

Section: Phenotypingmentioning

confidence: 99%

“…High temperatures above a limit are considered to reverse the chilling effects of lower temperatures, and negative chill units are assessed for them (Cesaraccio et al, 2004). The Utah model (Richardson et al, 1974) and Low Chill model (Gilreath & Buchanan, 1981) are two popular CU models in temperate regions (Cesaraccio et al, 2004).…”

Section: Influence Of Cr Evaluation Models On Cr Qtl Mappingmentioning

confidence: 99%

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Mapping quantitative trait loci associated with chilling requirement, heat requirement and bloom date in peach (Prunus persica)

et al. 2009

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Summary• Chilling requirement, together with heat requirement, determines the bloom date, which has an impact on the climatic distribution of the genotypes of tree species. The molecular basis of floral bud chilling requirement is poorly understood, despite its importance to the adaptation and production of fruit trees. In addition, the genetic nature of heat requirement and the genetic interrelationships among chilling requirement, heat requirement and bloom date remain unclear.• A peach (Prunus persica) F 2 population of 378 genotypes developed from two genotypes with contrasting chilling requirements was used for linkage map construction and quantitative trait loci (QTL) mapping. The floral bud chilling and heat requirements of each genotype were evaluated over 2 yr and the bloom date was scored over 4 yr.• Twenty QTLs with additive effects were identified for three traits, including one major QTL for chilling requirement and two major QTLs for bloom date. The majority of QTLs colocalized with QTLs for other trait(s). In particular, one genomic region of 2 cM, pleiotropic for the three traits, overlapped with the sequenced peach EVG region.• This first report on the QTL mapping of floral bud chilling requirement will facilitate marker-assisted breeding for low chilling requirement cultivars and the map-based cloning of genes controlling chilling requirement. The extensive colocalization of QTLs suggests that there may be one unified temperature sensing and action system regulating chilling requirement, heat requirement and bloom date together

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Section: Phenotypingmentioning

confidence: 99%

Section: Influence Of Cr Evaluation Models On Cr Qtl Mappingmentioning

confidence: 99%

Mapping quantitative trait loci associated with chilling requirement, heat requirement and bloom date in peach (Prunus persica)

et al. 2009

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“…In this experiment we used the Utah model (Richardson et al, 1974) to compare the chill units of our peach cultivars and selection. More optimal rest prediction models have been developed for low-chilling nectarines and peaches (Gilreath and Buchanan, 1981b;Lu et al, 2012). Therefore, it may be effective to use a model specific for low-chill cultivars to obtain a more accurate prediction of blooming dates for 'Okinawa 1'.…”

mentioning

confidence: 99%

Chilling Requirements and Blooming Dates of Leading Peach Cultivars and a Promising Early Maturing Peach Selection, Momo Tsukuba 127

Sawamura¹,

Suesada²,

Sugiura³

et al. 2017

Hortic J

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A major goal of peach breeding programs in Japan is to develop cultivars with lower chilling requirements than the leading cultivars. Low-chill cultivars can be grown in subtropical as well as temperate regions. We investigated the chilling requirements (chill units; CU), heat requirements (growing degree hours; GDH), and blooming dates of 7 leading Japanese peach cultivars, 3 subtropical low-chill cultivars, and a promising new selection, Momo Tsukuba 127. In general, the CU of the 7 leading cultivars were higher than those of the 3 subtropical cultivars and Momo Tsukuba 127. The chilling and heat requirements were determined for the 3 leading high-chill cultivars ('Akatsuki', 'Hikawahakuhou', and 'Kawanakajimahakutou'), the low-chill cultivar 'Okinawa 1', and Momo Tsukuba 127 during 4 seasons at a single location. The CU for 'Okinawa 1' and Momo Tsukuba 127 were significantly lower than those of the three high-chill cultivars. Because Momo Tsukuba 127 had lower chilling requirements than the 7 leading peach cultivars but higher chilling requirements than the subtropical cultivars, we classified this new selection as a mid-chill variety. We used the CU and GDH, along with local temperature data, to estimate the blooming dates of 4 cultivars and the new selection during 11 seasons at one location. Regression analyses showed high correlations between the calculated and actual blooming dates. We also compared calculated and actual blooming dates for the 3 leading cultivars and Momo Tsukuba 127 at between17 and 21 locations per genotype. A total of 25 locations were used, and these were widely spread over the temperate zones of Japan. The correlations between the calculated and actual blooming dates were close to 1:1. Our results indicated that our CU and GDH values, along with actual temperature data, could be used to reliably estimate the blooming dates of the genotypes. Because of its lower chilling requirements, the new selection, Momo Tsukuba 127, bloomed 7 or more days earlier than the leading peach cultivars in this study.

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“…The second uses the hours below 8.4 "C for estimating available chilling. It is based upon the findings of Erez & Couvillon (1987) and Gilreath & Buchanan (1981) that the optimum temperature for satisfying chilling is 8.0 "C. The third uses the hours below 8.4 "C, together with half the hours between 8.5 to 10.4 "C, for estimating available chilling. It is based on many researchers' findings that temperatures up to approximately 10.O°C have some effect in breaking rest.…”

Section: Selection Of Criteria For Chilling Temperaturesmentioning

confidence: 99%

Estimating chilling duration from daily temperature extremes and elevation in Isreal

Aron¹,

Gat²

1991

Clim. Res.

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Deciduous plants require chilling temperatures in winter in order to complete the rest phase of dormancy and to enable normal renewed growth. Models were developed from limited Israeli records of hourly temperatures for estimating chilling temperatures at more widely available stations recording maximum and minimum temperatures. Models and maps were created not only for the traditional definition of chilling temperatures, I.e. hours below 7.2OC, but also for hours below 8.4 "C and 10.4 "C. These data will be useful for both operational care and planning future plantings of deciduous crops.

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Rest termination and prediction models for low chilling blueberries and nectarines /

Cited by 27 publications

References 8 publications

Mapping quantitative trait loci associated with chilling requirement, heat requirement and bloom date in peach (Prunus persica)

Mapping quantitative trait loci associated with chilling requirement, heat requirement and bloom date in peach (Prunus persica)

Chilling Requirements and Blooming Dates of Leading Peach Cultivars and a Promising Early Maturing Peach Selection, Momo Tsukuba 127

Estimating chilling duration from daily temperature extremes and elevation in Isreal

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