Abstract
Mode of inheritance of cold hardiness (CH) in woody perennials is not wellunderstood. This study was undertaken to determine the mode of inheritance and gene action of CH in blueberry ( Vaccinium section Cyanococcus ). Two testcross populations (segregating for CH) derived from interspecific hybrids of V. darrowi (drw) × V. caesariense (csr) were used. Plants were cold-acclimated by a 4-week exposure to 4°C. Bud CH (LT 50 ) was defined as the temperature causing 50% injury (visual) when subjected to controlled freeze–thaw. Results show that the drw and csr parents had an LT50 of –13° and –20°C, respectively. The F 1 population exhibited mean LT 50 of –14.7°C. The csr and drw testcross populations had a mean LT 50 of –18° (39 individuals) and –14°C (33 individuals), respectively. Individuals of each population were distributed between parental values with center of distribution skewed toward the testcross parent. Since individuals having LT 50 s as same as the recurrent parents were present in each population of only 33–39 plants, data suggest that CH is determined by relatively few genes. To determine gene action, the estimates for various genetic parameters (calculated from joint scaling test) were used in generation means analysis to test various models. Results indicate that CH in blueberry can be best explained by simple-additive dominance model, whereas models including epistatic components did not satisfactorily explain the data.
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Claims 7
Claim · model-written summary
The V. darrowi parent had a bud LT50 of –13°.
Verbatim
e0“the drw and csr parents had an LT50 of –13° and –20°C, respectively”
e1“V. darrowi (drw) × V. caesariense (csr)”
Claim · model-written summary
The V. caesariense parent had a bud LT50 of –20°C.
- Taxon
- V. caesariense
Vaccinium caesariensee1 - Outcome
- LT50e0
- Value
- –20°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the drw and csr parents had an LT50 of –13° and –20°C, respectively”
e1“V. darrowi (drw) × V. caesariense (csr)”
Claim · model-written summary
The F1 population had a mean LT50 of –14.7°C.
Verbatim
e0“The F 1 population exhibited mean LT 50 of –14.7°C.”
e1“in Blueberry”
Claim · model-written summary
The csr testcross population had a mean LT50 of –18°.
Verbatim
e0“The csr and drw testcross populations had a mean LT 50 of –18° (39 individuals) and –14°C (33 individuals), respectively.”
e1“in Blueberry”
Claim · model-written summary
The drw testcross population had a mean LT50 of –14°C.
Verbatim
e0“The csr and drw testcross populations had a mean LT 50 of –18° (39 individuals) and –14°C (33 individuals), respectively.”
e1“in Blueberry”
Claim · model-written summary
Cold hardiness in blueberry appears to be controlled by relatively few genes.
Not reportedDirection
Verbatim
e0“data suggest that CH is determined by relatively few genes.”
e1“in Blueberry”
Claim · model-written summary
A simple-additive dominance model best explained blueberry cold hardiness; models with epistasis did not satisfactorily explain it.
Verbatim
e0“CH in blueberry can be best explained by simple-additive dominance model, whereas models including epistatic components did not satisfactorily explain the data.”