Repeatability and the optimal number of measurements for screening of soybean cultivars under water deficit

Duarte, Anunciene Barbosa; Ferreira, Dalton de Oliveira; Silva, Felipe Lopes da

doi:10.5935/1806-6690.20220028

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Scientific Article • Rev. Ciênc. Agron. 53 • 2022 • https://doi.org/10.5935/1806-6690.20220028 copy

Repeatability and the optimal number of measurements for screening of soybean cultivars under water deficit¹ 1 Trabalho extraído de tese de doutorado em fitotecnia na Universidade Federal de Viçosa e financiado pelo Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Repetibilidade e número ótimo de medições para screening de cultivares de soja sob déficit hídrico

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed at determining the optimal number of replications and measurements necessary for the screening of soybean cultivars subjected to three conditions of water availability during the initial stage of development. Two experiments were carried out in a greenhouse. A randomized block design was used, in a factorial scheme with two factors (cultivar and water availability), six replications, ten cultivars and three conditions of water availability (control condition, in which the sand was moistened with water; stress control in the water potential of -0.2 MPa and stress condition in the water potential of -0.4 MPa). At 20 days after cultivation, measurements were taken, subsequently estimating the repeatability coefficient, of the number of necessary measurements and of the determination coefficient. The repeatability coefficient was estimated by distinct statistical procedures, such as method of analysis of variance, principal components with basis on the matrices of phenotypic variances and covariances; principal components with basis on the matrices of correlation and structural analysis. For the determination of the number of replications, the repeatability coefficients ranged from low to high in experiment I, except for the root variables, which presented high values in both experiments. In experiment II, in turn, the magnitudes of the determination coefficients were above 90%. For plant height, number of leaves, root length and dry matter of the aerial part, only two replications would be necessary to obtain 80% confidence. Regarding the number of measurements per parcel, only one plant could be evaluated in each parcel, with 85% confidence for both experiments. Only two replications and one measurement per parcel are enough for high estimates of repeatability. This way, adequate efficiency is obtained in the selection of superior materials for tolerance to water deficit, during the initial stages of soybean development.

Keywords:
Glycine max ; Number of repetitions; Drought stress; Polyethylene glycol; Early selection

Experiment I
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Germination	0.17	55.69	0.39	79.52	0.30	71.88	0.19	58.17	0.17	55.85
Height	0.42	81.12	0.73	94.17	0.74	94.47	0.43	82.13	0.42	81.20
N° of leaves	0.30	71.54	0.66	92.18	0.70	93.20	0.37	77.56	0.30	71.71
DMAP	0.44	82.58	0.60	90.01	0.50	85.58	0.43	82.18	0.47	84.13
Root length	0.50	85.85	0.72	93.90	0.65	91.62	0.46	83.90	0.52	86.67
DMR	0.18	57.47	0.28	69.83	0.22	63.34	0.20	60.34	0.20	60.18

Experiment II
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Germination	0.64	91.50	0.66	92.07	0.65	91.69	0.64	91.59	0.64	91.50
Height	0.72	93.83	0.75	94.64	0.73	94.29	0.73	94.26	0.72	93.83
N° of leaves	0.56	88.52	0.61	90.21	0.58	89.27	0.58	89.22	0.56	88.52
DMAP	0.73	94.18	0.73	94.28	0.74	94.44	0.74	94.41	0.73	94.18
Root length	0.80	96.10	0.83	96.65	0.81	96.27	0.81	96.22	0.80	96.10
DMR	0.76	94.90	0.76	95.11	0.78	95.39	0.77	95.35	0.76	94.90

Experiment I
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Total length	0.87	96.3	0.87	96.3	0.87	96.3	0.87	96.3	0.87	96.28
Projected area	0.89	96.9	0.89	96.9	0.89	96.89	0.89	96.88	0.89	96.86
Surface area	0.89	96.9	0.89	96.9	0.89	96.89	0.89	96.88	0.89	96.86
Average diameter	0.27	59.9	0.35	68.3	0.29	61.56	0.27	59.13	0.27	59.87
Length/volume	0.87	96.3	0.87	96.3	0.87	96.3	0.87	96.3	0.87	96.28
Volume	0.87	96.3	0.87	96.5	0.87	96.42	0.87	96.41	0.87	96.34

Experiment II
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Total length	0.8	94	0.81	94.4	0.81	94.3	0.8	94.26	0.8	93.96
Projected area	0.78	93.5	0.8	94.2	0.8	94	0.79	93.89	0.78	93.53
Surface area	0.78	93.5	0.8	94.2	0.8	94	0.79	93.89	0.78	93.53
Average diameter	0.05	16.2	0.3	63	0.19	49.11	0.1	30.68	0.05	16.22
Length/volume	0.8	94	0.81	94.4	0.81	94.3	0.8	s	0.8	93.96
Volume	0.71	90.9	0.74	91.9	0.72	91.09	0.71	90.91	0.71	90.91

Experiment I
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Height	0.94	99.18	0.94	99.24	0.94	99.23	0.94	99.22	0.94	99.18
N° of leaves	0.95	99.34	0.95	99.36	0.95	99.35	0.95	99.34	0.95	99.34
Root length	0.93	99.11	0.93	99.13	0.93	99.12	0.93	99.12	0.93	99.11

Experiment II
Variable	ANOVA		PCcov		PCcor		EAcor		EAcov
Variable	r	R²	r	R²	r	R²	r	R²	r	R²
Height	0.96	99.47	0.96	99.48	0.96	99.48	0.96	99.48	0.96	99.47
N° of leaves	0.93	99.13	0.94	99.14	0.93	99.14	0.93	99.14	0.93	99.13
Root length	0.96	99.42	0.96	99.43	0.96	99.44	0.96	99.43	0.96	99.42

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[1] Editor do artigo: Profa. Charline Zaratin Alves - charline.alves@ufms.br

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Repeatability and the optimal number of measurements for screening of soybean cultivars under water deficit1 1 Trabalho extraído de tese de doutorado em fitotecnia na Universidade Federal de Viçosa e financiado pelo Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Repetibilidade e número ótimo de medições para screening de cultivares de soja sob déficit hídrico

ABSTRACT

Repeatability and the optimal number of measurements for screening of soybean cultivars under water deficit¹ 1 Trabalho extraído de tese de doutorado em fitotecnia na Universidade Federal de Viçosa e financiado pelo Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)