Yield of Cucumbers in Multiple-harvest Trials with Dissimilar Genotypes in Border Rows

Wehner, Todd C.; Miller, C. H.

doi:10.21273/hortsci.25.1.106

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…That plot size was found to be optimum for yield measurement (Swallow and Wehner, 1986). Plot end borders were found to be unnecessary for efficient trialing (Wehner, 1988a), as were multiple-row plots (Wehner and Miller, 1990), so neither was used.…”

Section: Methodsmentioning

confidence: 99%

Ten Cycles of Recurrent Selection for Fruit Yield, Earliness, and Quality in Three Slicing Cucumber Populations

Wehner¹,

Cramer²

1996

jashs

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Fruit yield, earliness, and quality have low to moderate heritability, but are traits of major importance in cucumber (Cucumis sativus L.). The objective of this study was to determine the changes made in those traits using recurrent selection in three slicing cucumber populations (NCMBS, NCES1, and NCBA1). During population improvement, one or two replications of 200 to 335 half-sib families were evaluated in the spring season for five traits: total, early, and marketable fruit per plot, fruit shape rating, and a simple weighted index (SWI = 0.2(total yield)/2 + 0.3(early yield) + 0.2(% marketable)/10 + 0.3(fruit shape). Families from each population were intercrossed in an isolation block during the summer season using remnant seeds of the best 10% selected using the index. Response was evaluated using a split-plot treatment arrangement in a randomized complete block design with 32 replications in each of two seasons (spring and summer). Whole plots were the three populations, and subplots were the 11 cycles (cycles 0 to 9 plus checks). We measured improvement in performance of the populations in a selected (spring) and unselected environment (summer). Significant gains were made for all traits in all populations over the 9 to 10 cycles of recurrent selection. Greatest progress was made for the NCMBS population, with an average of 37% gain from cycle 0 to 9 over all five traits. The trait where most progress was made was early yield, with an average of 63% gain from cycle 0 to 9 over the three populations.

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Section: Methodsmentioning

confidence: 99%

Ten Cycles of Recurrent Selection for Fruit Yield, Earliness, and Quality in Three Slicing Cucumber Populations

Wehner¹,

Cramer²

1996

jashs

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“…The plot size for this study was chosen based on recommendations by Swallow and Wehner (1986) for the optimum plot size for once-over harvest of pickling cucumbers using paraquat. Small, single-row plots were used because they were more efficient than large, multiple-row plots (Wehner and Miller, 1990).…”

Section: Population Formation and Selectionmentioning

confidence: 99%

Testcross Performance of Three Selection Cycles from Four Pickling Cucumber Populations

Cramer¹,

Wehner²

1999

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Progress was measured in four populations of cucumber (Cucumis sativus L.) improved by recurrent selection. The populations were the North Carolina wide base pickle (NCWBP), medium base pickle (NCMBP), elite pickle 1 (NCEP1), and hardwickii 1 (NCH1). Families from each of three cycles (early, intermediate, and late) from each population were randomly chosen and crossed with Gy 14 to produce gynoecious hybrids. Gy 14 is a gynoecious inbred used commonly as a female parent in the production of pickling cucumber hybrids. Once the plants had 10% oversized (>51 mm in diameter) fruit, plots were sprayed with paraquat to simulate once-over harvest. Selection cycles were evaluated for total, early, and marketable yield, and fruit shape. Testcross performance for fruit shape rating increased over cycles for the NCWBP and NCMBP populations when tested in either season. Testcross performance for total and early yield of the NCEP1 population tested in the spring decreased with selection, but remained constant over cycles in the summer season. The majority of yield traits in each population remained unchanged across selection cycles. Of the four populations studied, the NCMBP population had the greatest gain (7%) in testcross performance over cycles and averaged over all traits. In addition, testcross performance for fruit shape rating had the greatest gain (11%) with selection and averaged over populations. Years and seasons greatly influenced testcross performance for fruit yield and shape rating. In most instances, the fruit yield and shape of Gy 14 was higher than the testcross performance of population-cycle combinations. The performance of several families exceeded that of Gy 14 when testcross combinations were made. Those families could be selected for use in the development of elite cultivars. Chemical name used: 1,1'-dimethyl-4,4'-bipyridinium ion (paraquat).

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Cramer

Wehner

1999

Euphytica

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Yield of Cucumbers in Multiple-harvest Trials with Dissimilar Genotypes in Border Rows

Cited by 4 publications

References 5 publications

Ten Cycles of Recurrent Selection for Fruit Yield, Earliness, and Quality in Three Slicing Cucumber Populations

Ten Cycles of Recurrent Selection for Fruit Yield, Earliness, and Quality in Three Slicing Cucumber Populations

Testcross Performance of Three Selection Cycles from Four Pickling Cucumber Populations

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