Abstract
Large‐scale trait evaluation may enhance the utilization of germplasm collections by breeders. However, there is concern that this information may not be repeatable outside the area of testing because of large genotype × location interaction. Our objective was to assess the repeatability of large‐scale evaluation results for durum wheat [ Triticum turgidum (L.) Thell. ssp. turgidum conv. durum (Desf.) MacKey] across two areas of the Mediterranean region. A subset of 600 entries from a world collection was evaluated for six agronomic traits at one site in northern Syria and one in Sicily. Pearson's and Spearman's rank correlations of entry values between locations indicated that the repeatability as measured by both coefficients was high for heading time ( r ≥ 0.73), moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57), relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30), and non‐significant for early vigor score. Comparison between phenotypic and genetic correlations suggested that not only genotype × location interactions but also experimental errors contributed substantially to departures from complete repeatability. When each location alternated as the selection site and the other as the test site, at least 50% of the advantage shown by the top 10% entries over the remaining accessions at the selection site could be maintained at the test location for early or late heading, high kernel weight, and short or tall stature, for which 30 to 57% of selected entries were common to both sites. At least 20% of the selection advantage was maintained for high kernels per spike and grain yield. The results support the potential usefulness of large‐scale germplasm evaluation trials for crop improvement.
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Claims 9
Claim · model-written summary
Repeatability of entry values between the two locations was high for heading time (r ≥ 0.73).
- Taxon
- durum wheat
Triticum turgidum subsp. durumt0 - Outcome
- repeatabilitye1
- Direction
- highe1
- Value
- r ≥ 0.73e1
- Qualifier
- for heading timee1
- Setting
- one site in northern Syria and one in Sicilye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“the repeatability as measured by both coefficients was high for heading time ( r ≥ 0.73), moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57), relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30), and non‐significant for early vigor score”
e0“A subset of 600 entries from a world collection was evaluated for six agronomic traits at one site in northern Syria and one in Sicily”
Claim · model-written summary
Repeatability of entry values between the two locations was moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57).
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- repeatabilitye1
- Direction
- moderately highe1
- Value
- 0.48 ≤ r ≤ 0.57e1
- Qualifier
- for kernel weight and plant heighte1
- Setting
- one site in northern Syria and one in Sicilye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“the repeatability as measured by both coefficients was high for heading time ( r ≥ 0.73), moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57), relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30), and non‐significant for early vigor score”
e0“A subset of 600 entries from a world collection was evaluated for six agronomic traits at one site in northern Syria and one in Sicily”
Claim · model-written summary
Repeatability of entry values between the two locations was relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30).
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- repeatabilitye1
- Direction
- relatively lowe1
- Value
- 0.18 ≤ r ≤ 0.30e1
- Qualifier
- for grain yield and kernels per spikee1
- Setting
- one site in northern Syria and one in Sicilye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“the repeatability as measured by both coefficients was high for heading time ( r ≥ 0.73), moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57), relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30), and non‐significant for early vigor score”
e0“A subset of 600 entries from a world collection was evaluated for six agronomic traits at one site in northern Syria and one in Sicily”
Claim · model-written summary
Repeatability of entry values between the two locations for early vigor score was not significant.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- repeatabilitye1
- Qualifier
- for early vigor scoree1
- Setting
- one site in northern Syria and one in Sicilye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“the repeatability as measured by both coefficients was high for heading time ( r ≥ 0.73), moderately high for kernel weight and plant height (0.48 ≤ r ≤ 0.57), relatively low for grain yield and kernels per spike (0.18 ≤ r ≤ 0.30), and non‐significant for early vigor score”
e0“A subset of 600 entries from a world collection was evaluated for six agronomic traits at one site in northern Syria and one in Sicily”
Claim · model-written summary
Comparison of phenotypic and genetic correlations suggests that genotype × location interaction and experimental error both contribute substantially to departures from complete repeatability.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- departures from complete repeatabilitye5
- Qualifier
- not only genotype × location interactions but also experimental errorse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e5“Comparison between phenotypic and genetic correlations suggested that not only genotype × location interactions but also experimental errors contributed substantially to departures from complete repeatability”
Claim · model-written summary
When each location served as selection site and the other as test site, at least 50% of the selection advantage of the top 10% entries was maintained at the test location for early or late heading, high kernel weight, and short or tall stature.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- the advantage shown by the top 10% entriese6
- Value
- at least 50%e6
- Qualifier
- for early or late heading, high kernel weight, and short or tall staturee6
- Comparator
- remaining accessionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e6“at least 50% of the advantage shown by the top 10% entries over the remaining accessions at the selection site could be maintained at the test location for early or late heading, high kernel weight, and short or tall stature”
Claim · model-written summary
For early or late heading, high kernel weight, and short or tall stature, 30 to 57% of selected entries were common to both sites.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- selected entriese7
- Value
- 30 to 57%e7
- Qualifier
- for early or late heading, high kernel weight, and short or tall staturee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e7“for early or late heading, high kernel weight, and short or tall stature, for which 30 to 57% of selected entries were common to both sites”
Claim · model-written summary
At least 20% of the selection advantage was maintained at the test location for high kernels per spike and grain yield.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- selection advantagee1
- Value
- At least 20%e1
- Qualifier
- for high kernels per spike and grain yielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“At least 20% of the selection advantage was maintained for high kernels per spike and grain yield”
Claim · model-written summary
The results support the potential usefulness of large-scale germplasm evaluation trials for crop improvement.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- potential usefulnesse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Durum Wheat”
e1“The results support the potential usefulness of large‐scale germplasm evaluation trials for crop improvement”