Análise multivariada e testes de vigor na determinação da qualidade de sementes de <i>Brachiaria decumbens</i>

Silva, Givanildo Zildo da; Martins, Cibele Chalita; Bruno, Riselane de Lucena Alcântara; Pereira, Francisco Elder Carlos Bezerra; Jeromini, Tatiane Sanches

doi:10.5935/1806-6690.20190034

Brasil

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Crop Science • Rev. Ciênc. Agron. 50 (2) • Apr-Jun 2019 • https://doi.org/10.5935/1806-6690.20190034 linkcopiar

Análise multivariada e testes de vigor na determinação da qualidade de sementes de Brachiaria decumbens

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

Este estudo teve por objetivo verificar a eficiência da análise multivariada na identificação de testes de vigor promissores para a avaliação da qualidade fisiológica de lotes de sementes de Brachiaria decumbens cv. Basilisk. Foram avaliados 13 lotes de sementes de B. decumbens, cv. Basilisk, quanto aos seguintes parâmetros: teor de água, germinação, primeira contagem de germinação, teste de frio, condutividade elétrica, crescimento de plântulas, massa seca de plântulas, primeira contagem e porcentagem de emergência de plântulas em substrato areia no laboratório e emergência de plântulas em campo. Os dados obtidos em cada teste, em delineamento inteiramente casualizado, foram analisados separadamente por meio de análise de variância, teste de Scott-Knott e análise multivariada. A análise multivariada de componentes principais é eficiente para discriminar os testes de vigor e de germinação de sementes B. decumbens, cv. Basilisk, capazes de identificar os lotes de desempenho superior em campo. Os testes de germinação, primeira contagem de germinação, emergência de plântulas em areia, primeira contagem de emergência de plântulas em areia, comprimento da parte aérea de plântulas e o teste de frio são promissores na avaliação da qualidade fisiológica de lotes de sementes de B. decumbens, cv. Basilisk, fornecendo informações semelhantes à emergência de plântulas em campo.

Palavras-chave: Qualidade fisiológica; Controle de qualidade; Análise de componente principal; Gramínea forrageira; Emergência de plântulas em campo

Lots	WC	EF	G	FGC	E	FEC	CT	RL	SL	DMR	DMAP
Lots	--------------------------------------- % ---------------------------------------							-------- cm --------		---- g/ seedling ----
1	8.6	76 a	83 a	81 a	76 a	73 a	63 a	9.9 b	5.8 a	0.66 b	1.57 a
2	9.5	58 a	77 b	76 a	70 a	66 a	68 a	9.4 b	5.0 a	0.54 c	1.38 b
3	9.0	63 a	79 b	70 b	62 a	54 a	62 a	12.2 a	5.5 a	0.72 b	1.45 b
4	8.8	57 a	87 a	77 a	65 a	57 a	64 a	9.7 b	5.9 a	0.57 c	1.31 b
5	9.4	65 a	74 b	71 b	62 a	61 a	52 a	7.8 c	5.4 a	0.43 c	1.37 b
6	8.5	40 b	78 b	69 b	65 a	63 a	65 a	9.9 b	5.7 a	0.44 c	1.20 b
7	10.0	43 b	77 b	71 b	67 a	66 a	62 a	9.1 b	5.0 b	0.55 c	1.32 b
8	9.9	42 b	63 c	62 b	61 a	61 a	59 a	10.6 a	5.0 b	0.68 b	1.50 a
9	9.7	48 b	74 b	64 b	29 b	27 b	37 b	12.1 a	4.8 b	0.92 a	1.71 a
10	10.5	40 b	75 b	57 c	29 b	27 b	28 c	11.3 a	4.4 b	0.42 c	1.07 b
11	9.9	40 b	63 c	45 d	32 b	29 b	33 c	7.8 c	5.4 a	0.77 b	1.74 a
12	9.2	37 b	74 b	50 d	25 b	20 b	45 b	9.7 b	4.7 b	0.58 c	1.35 b
13	10.1	36 b	65 c	55 c	31 b	25 b	28 c	10.7 a	4.4 b	0.71 b	1.38 b
F	-	3.7^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	5.9^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	13.5^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	31.1^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	29.5^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	21.7^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	5.7^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	6.5^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	6.8^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability	4.7^ Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability
CV (%)	-	26.9	8.2	9.0	13.2	14.9	12.6	11.7	7.7	18.4	12.1

Lots	Electrical conductivity (µS cm^-1 g^-1)
	50 mL					75 mL
	2h	4h	6h	8h	24h	2h	4h	6h	8h	24h
1	15.6 a	19.4 a	22.2 a	25.0 a	43.0 a	13.7 a	15.0 a	16.9 a	18.8 b	30.6 b
2	27.8 d	32.9 c	35.5 c	39.2 c	61.7 c	17.1 b	19.9 c	21.5 c	24.0 c	36.7 c
3	15.1 a	17.6 a	19.4 a	21.6 a	33.4 a	10.9 a	12.2 a	13.2 a	14.6 a	23.5 a
4	24.1 c	28.4 b	32.0 b	34.4 b	57.0 c	20.2 c	22.9 c	24.7 d	27.2 d	41.1 c
5	22.8 c	27.2 b	30.3 b	34.0 b	50.0 b	16.5 b	19.8 b	22.1 c	24.7 c	37.3 c
6	19.2 b	26.2 b	29.1 b	32.0 b	52.3 b	15.9 b	18.5 b	20.3 b	22.8 c	35.8 c
7	20.9 b	24.6 b	26.7 b	30.0 b	50.8 b	16.4 b	18.4 b	20.3 b	22.5 c	38.4 c
8	13.9 a	17.7 a	20.3 a	23.0 a	36.9 a	11.4 a	13.4 a	15.1 a	16.9 a	27.2 a
9	25.4 c	30.7 c	34.0 c	37. 9 c	56.7 c	24.2 d	27.9 d	31.2 e	33.9 e	51.5 d
10	16.1 a	18.9 a	20.6 a	23.1 a	37.4 a	11.8 a	13.4 a	14.7 a	16.5 a	26.1 a
11	20.1 b	24.2 b	27.6 b	30.1 b	49.9 b	15.7 b	17.6 b	19.2 b	21.5 b	33.1 b
12	30.5 d	34.9 c	37.6 c	41.2 c	62.0 c	22.1 c	24.8 c	26.3 d	28.8 d	42.5 c
13	15.6 a	18.8 a	21.0 a	23.7 a	41.3 a	11.5 a	13.5 a	15.1 a	17.2 a	28.1 a
F	24.98^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	22.26^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	19.77^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	18.93^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	13.96^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	18.83^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	18.85^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	20.08^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	16.07^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability	13.98^ Significant at 1% probability by the F-test. Averages followed by the same letter do not differ from each other according to Scott-Knott's test at 5% probability
CV (%)	10.41	10.23	10.33	10.15	10.47	12.24	12.17	11.61	12.45	11.99

Variables	Component 1	Component 2
Seedling emergence in the field	0.13	-0.71
Seedling emergence in sand	0.31	-0.93
First emergence count	0.30	-0.91
Germination	-0.17	-0.71
First germination count	0.09	-0.90
Cold test	0.07	-0.92
Root length	0.18	0.29
Shoot length	0.02	-0.85
Dry mass of the roots	-0.17	0.40
Dry mass of the aerial part	-0.22	0.15
Electrical conductivity (EC) 50 mL/2h	-0.92	-0.15
Electrical conductivity (EC) 50 mL/4h	-0.93	-0.19
Electrical conductivity (EC) 50 mL/6h	-0.94	-0.20
Electrical conductivity (EC) 50 mL/8h	-0.57	-0.26
Electrical conductivity (EC) 50 mL/24h	-0.91	-0.24
Electrical conductivity (EC) 75 mL/2h	-0.98	-0.08
Electrical conductivity (EC) 75 mL/4h	-0.99	-0.08
Electrical conductivity (EC) 75 mL/6h	-0.98	-0.08
Electrical conductivity (EC) 75 mL/8h	-0.98	-0.08
Electrical conductivity (EC) 75 mL/24h	-0.96	-0.11
Eigenvalues	8.95	6.48
Total Variance (%)	42.64	73.47

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[TFN1] ^**
Significant at 1% probability by the F-test. Averages followed by the same letter in the column do not differ from each other using the Scott-Knott test at 5% probability