Abstract
Ten single‐ear and 10 two‐ear inbred lines of maize, Zea mays L., in testcrosses with a one‐ear single cross and a two‐ear single cross were compared for stability of yield performance in two experiments, one with 12 environments, four locations for 3 years, and one with 24 environments, four plant densities at two locations for 3 years. Stability is described by three parameters: mean yield, regression of mean yield on an environmental index, and deviations from regression. The environmental index is the mean yield of all hybrids at each environment and has a regression of 1.0. A stable variety has a high mean yield, b = 1.0, and deviations near zero. Stability parameters for the four groups of hybrids were similar in the two experiments. The (1 × 1) × 1 group had below‐average yields in the low‐yield environments and above‐average yields in the high‐yield environments, but the reverse situation occurred for the (2 × 2) × group. Deviations from regression were much higher for the (1 × 1) × 1 group than the (2 × 2) × 2 group. The (1 × 1) × 2 group most nearly satisfied the definition of a stable variety on the basis of mean yield and regression, but was intermediate between the (1 × 1) × 1 and (2 × 2) × groups for deviations from regression.
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Claims 6
Claim · model-written summary
Stability parameters for the four maize hybrid groups were similar in both experiments.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stability parameters for the four groups of hybrids were similar in the two experiments”
t0“Maize”
Claim · model-written summary
The (1 × 1) × 1 group yielded below average in low-yield environments and above average in high-yield environments.
- Material
- (1 × 1) × 1e0
- Outcome
- yieldse0
- Setting
- low‐yield environments and above‐average yields in the high‐yield environmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The (1 × 1) × 1 group had below‐average yields in the low‐yield environments and above‐average yields in the high‐yield environments”
t0“Maize”
Claim · model-written summary
The (2 × 2) hybrid group showed the reverse yield response across low- and high-yield environments.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reverse situation occurred for the (2 × 2) × group”
t0“Maize”
Claim · model-written summary
Deviations from regression were much higher in (1 × 1) × 1 than in (2 × 2) × 2 hybrids.
- Material
- (1 × 1) × 1 groupe0
- Outcome
- Deviations from regressione0
- Direction
- much highere0
- Comparator
- (2 × 2) × 2 groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deviations from regression were much higher for the (1 × 1) × 1 group than the (2 × 2) × 2 group”
t0“Maize”
Claim · model-written summary
The (1 × 1) × 2 group most nearly met the stable-variety definition by mean yield and regression.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The (1 × 1) × 2 group most nearly satisfied the definition of a stable variety on the basis of mean yield and regression”
t0“Maize”
Claim · model-written summary
The (1 × 1) × 2 group was intermediate between the other groups for regression deviations.
- Outcome
- deviations from regressione0
- Direction
- intermediatee0
- Comparator
- (1 × 1) × 1 and (2 × 2) × groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was intermediate between the (1 × 1) × 1 and (2 × 2) × groups for deviations from regression”
t0“Maize”