TESTE DO pH DO EXSUDATO EM SEMENTES DE ARROZ

SANTOS, MARIELY DE ABREU DOS; OLIVEIRA, IZABELA CRISTINA DE; NOGUEIRA, GRAZIELY ALVES; SILVA, JOSUÉ BISPO DA; CANDIDO, ANA CARINA DA SILVA; ALVES, CHARLINE ZARATIN

doi:10.1590/1983-21252019v32n412rc

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Agronomy • Rev. Caatinga 32 (4) • Oct-Dec 2019 • https://doi.org/10.1590/1983-21252019v32n412rc copiar

TESTE DO pH DO EXSUDATO EM SEMENTES DE ARROZ

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

O trabalho objetivou avaliar a eficiência do teste de pH do exsudato na qualidade fisiológica de sementes de arroz, com e sem tegumento. Para o teste, o delineamento experimental foi inteiramente casualizado, com sete lotes de arroz e quatro repetições. Os lotes foram submetidos a determinação do teor de água e avaliação da qualidade fisiológica inicial por meio dos testes de germinação, primeira contagem de germinação, emergência, índice de velocidade de emergência e tetrazólio. O teste de pH do exsudato foi conduzido com 100 sementes de cada tratamento, com tegumento e sem tegumento. As sementes foram embebidas individualmente em 2,0 mL de água destilada, por diferentes períodos (20, 40 e 60 minutos) e três temperaturas (20, 25 e 30 °C). Os resultados foram submetidos ao teste de Scott Knott a 5% de probabilidade. O teste do pH do exsudato é promissor para avaliar a qualidade fisiológica de sementes de arroz, detectando diferenças de vigor entre lotes comercializáveis. Este teste deve ser conduzido com sementes de arroz sem tegumento, na temperatura de 25 °C, com tempo de embebição de 60 minutos.

Palavras-chave:
Oryza sativa; Qualidade fisiológica; Vigor

LOTS	WC	FGC	G	SE	ESI	TZ
	(%)	(%)	(%)	(%)	-	(%)
1	10.20	67 a	92 a	89 a	4.43 a	89 a
2	10.03	73 a	90 a	83 b	3.15 b	92 a
3	10.86	59 b	80 b	76 c	2.28 c	78 b
4	10.15	71 a	85 b	83 b	3.14 b	88 a
5	10.89	57 b	81 b	80 b	3.08 b	78 b
6	10.06	57 b	80 b	68 c	2.18 c	73 c
7	10.19	60 b	83 b	72 c	2.29 c	78 b
F	-	7.41^* * Significant by F test at 5% probability. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	8.46^* * Significant by F test at 5% probability. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	16.69^* * Significant by F test at 5% probability. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	31.88^* * Significant by F test at 5% probability. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	21.94^* * Significant by F test at 5% probability. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.
CV%	-	7.83	4.19	4.25	9.52	3.75

Universidade Federal Rural do Semi-Árido Avenida Francisco Mota, número 572, Bairro Presidente Costa e Silva, Cep: 5962-5900, Telefone: 55 (84) 3317-8297 - Mossoró - RN - Brazil
E-mail: caatinga@ufersa.edu.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author

	20 ºC
Lot	20 min	40 min	60 min
1	98	94	93
2	98	94	93
3	96	94	91
4	98	97	94
5	96	96	91
6	96	94	91
7	97	94	93
F	0.50^ns ns not significant. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	0.36^ns ns not significant. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	0.55^ns ns not significant. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.
CV%	3.69	3.64	3.24
	25 ºC
Lot	20 min	40 min	60 min
1	98 a	96	93
2	92 a	93	93
3	95 b	95	92
4	98 a	96	94
5	94 b	93	93
6	92 b	91	90
7	93 b	92	90
F	2.90^* * Significant by F test at 5% probability.	0.83^ns ns not significant. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.	2.40^ns ns not significant. CV - coefficient of variation. Means follow by the same letter in the column do not differ between 5% probability by the Scott-Knott test.
CV%	2.99	3.08	2.10
	30 ºC
Lot	20 min	40 min	60 min
1	98 a	96 a	92 a
2	96 b	93 a	90 a
3	89 b	87 b	86 b
4	99 a	98 a	97 a
5	97 a	93 a	92 a
6	89 b	84 b	82 b
7	91 b	86 b	84 b
F	4.90^* * Significant by F test at 5% probability.	3.83^* * Significant by F test at 5% probability.	3.42^* * Significant by F test at 5% probability.
CV%	4.20	6.12	6.23

	20 ºC
Lot		20 min	40 min	60 min
1	94 a		92 a		92 a
2	95 a		89 a		88 a
3	85 a		79 b		78 b
4	90 a		88 a		86 a
5	89 a		83 b		81 b
6	66 c		63 c		61 c
7	78 b		77 b		77 b
F	12.14^* * Significant by F test at 5% probability.		15.81^* * Significant by F test at 5% probability.		15.62^* * Significant by F test at 5% probability.
CV%	6.90		6.06		6.41
	25 ºC
Lot		20 min	40 min	60 min
1	95 a		94 a		90 a
2	91 a		86 a		76 b
3	74 c		62 c		64 c
4	84 b		79 b		77 b
5	82 b		77 b		73 b
6	76 c		62 c		60 c
7	75 c		69 c		68 c
F	15.73^* * Significant by F test at 5% probability.		15.72^* * Significant by F test at 5% probability.		10.23^* * Significant by F test at 5% probability.
CV%	5.00		8.02		0.86
Lot	30 ºC
Lot	20 min		40 min		60 min
1	92 a		86 a		84 a
2	91 a		83 a		82 a
3	82 b		76 a		73 b
4	85 b		77 a		76 b
5	85 b		80 a		74 b
6	76 c		61 b		63 b
7	82 b		77 a		70 b
F	6.46^* * Significant by F test at 5% probability.		7.14^* * Significant by F test at 5% probability.		4.06^* * Significant by F test at 5% probability.
CV%	5.13		7.77		9.47