Heritability estimates and progeny testing of phenotypic selections for soluble solids content in dehydrator onion |
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Authors: | Arthur D Wall Joe N Corgan |
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Institution: | (1) Department of Agronomy & Horticulture, MSC 3Q, New Mexico State University, P.O. Box 30003, Las Cruces, NM, 88003–8003, U.S.A |
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Abstract: | Soluble solids comprise most of onion bulb dry mass, and dehydrator onion cultivars are developed from breeding populations
that have high dry mass content. Realized and narrow-sense heritability estimates were obtained for the soluble solids content
(SSC) trait in two open-pollinated dehydrator onion breeding populations (BP) using response to selection and half-sib family
analysis. Parental populations, designated as BP9335-U and BP9243-U, were derived from two-way crosses of lines advanced as
open- pollinated (OP) populations to the F7 or F_6 generation, respectively. BP9335-U had one previous selection cycle for
increased SSC and BP9243-U had three SSC selection cycles. In these experiments, parental populations were screened again
for high SSC, and selected bulbs were intermated to form half-sib progeny groups, designated as BP9335-S and BP9243-S. Mean
SSC was increased by 6.6% and a realized heritability estimate of 0.64 was obtained for BP9335-S. Mean SSC was increased by
6.3% and a realized heritability estimate of 0.36 was obtained for BP9243-S. Narrow-sense heritability estimates of 0.58 ±0.05
and 0.30 ±0.03 were obtained for parental populations BP9335-U and BP9243-U, respectively. Narrow-sense heritability estimates
of 0.40 ± 0.03 and 0.63 ± 0.23 were obtained for progeny populations derived from selected high-SSC bulbs of these lines (BP9335-S
and BP9243-S), respectively, indicating that there is significant additive genetic control of the SSC trait in these populations.
Significant differences in half-sib family performance in the advanced groups BP9335-S and BP9243-S demonstrate that progeny
testing was effective for evaluating phenotypic selections.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Allium cepa dry-mass dry-matter heritability non-structural carbohydrates soluble solids |
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