Physiological potential of sorghum seeds under discontinuous hydration and water deficiency conditions

Sarmento, Erivanessa Costa Sousa; Oliveira, Fernando Sarmento de; Cabral, Felipe Augusto Sombra; Oliveira, Daniel Farias; Dutra, Alek Sandro

doi:10.5935/1806-6690.20200069

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Scientific Article • Rev. Ciênc. Agron. 51 (4) • 2020 • https://doi.org/10.5935/1806-6690.20200069 copy

Physiological potential of sorghum seeds under discontinuous hydration and water deficiency conditions¹ 1 Estudo realizado pela primeira autora durante a disciplina Pesquisa Orientada em Tecnologia de Sementes, no Programa de Pós-Graduação em Agronomia/Fitotecnia, Universidade Federal do Ceará/UFC

Potencial fisiológico de sementes de sorgo sob condições de hidratação descontinuada e déficit hídrico

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Hydration and dehydration cycles during imbibition of seeds may influence their physiological performance, making them more vigorous and resistant to abiotic factors such as water stress. The aim was to investigate whether the times and discontinued hydration cycles condition higher tolerance to water deficiency conditions in germination and seed vigor and accumulation of organic compounds in sorghum seedlings. The experiment was carried out in a randomized experimental design with four replicates of 50 seeds. The treatments were arranged in a 3 × 4 × 6 factorial scheme (hydration times, hydration and dehydration cycles, osmotic potentials). The imbibition curve of the species was determined based on three times (X, Y and Z); and the dehydration curve was constructed. With these times, the seeds were submitted to 0, 1, 2 and 3 cycles of hydration and dehydration (HD). Then, they were submitted to germination test on paper moistened with polyethylene glycol 6000 solution at the osmotic potentials of 0.0 (distilled water), -0.2, -0.4, -0.6, -0.8 and -1.0 MPa. Germination and vigor of sorghum seeds are severely impaired in water potentials equal to or greater than -0.4 MPa. Application of three cycles of hydration and dehydration for a period of 13h in sorghum seeds improves tolerance to water deficiency conditions during germination and seedling development, and provides greater contents of soluble N-amino content and total soluble carbohydrates.

Key words:
Germination; Sorghum Bicolor ; Water Memory; Water Stress; Vigor

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E-mail: ccarev@ufc.br

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[1] *Author for correspondence

Time X (3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	97 Aaa	96 Aaa	21 Aab
1 cycle	96 Aaa	93 Aaa	20 Cbb
2 cycles	93 Aaa	51 Bbb	-
3 cycles	92 Aaa	92 Aaa	30 Cab
Time Y (9 h)
0 cycles	97 Aaa	96 Aaa	21 Acb
1 cycle	95 Aaa	95 Aaa	55 Abb
2 cycles	97 Aaa	93 Aaa	70 Aab
3 cycles	93 Aaa	92 Aaa	54 Bbb
Time Z (13 h)
0 cycles	97 Aaa	96 Aaa	21 Adb
1 cycle	94 Aaa	93 Aaa	35 Bcb
2 cycles	93 Aaa	87 Aaa	53 Bbb
3 cycles	96 Aaa	94 Aaa	71 Aab

Time X (3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	16.0 Ada	8.7 Abb	0.17 Aac
1 cycle	20.54 Aba	7.57 Ccb	0.59 Aac
2 cycles	22.27 Aaa	0.84 Bdb	-
3 cycles	17.18 Bca	11.73 Bab	0.57 Cac
Time Y (9 h)
0 cycles	16 Aca	8.7 Acb	0.17 Abc
1 cycle	21.37 Aba	9.27 Bcb	1.57 Aac
2 cycles	22.73 Aaa	11.78 Abb	2.34 Aac
3 cycles	22.54 Aaa	15.23 Aab	2.51 Bac
Time Z (13 h)
0 cycles	16 Aca	8.7 Acb	0.17 Acc
1 cycle	19.21 Bba	11.23 Abb	1.04 Acc
2 cycles	21.51 Aaa	12.54 Aab	2.43 Abc
3 cycles	22.36 Aaa	10.73 Bbb	4.86 Aac

Time X (3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	16.25 Aaa	7.25 Aab	1.0 Aac
1 cycle	15.25 Aaa	6.50 Aab	2.50 Aac
2 cycles	15.75 Aaa	1.25 Ccb	-
3 cycles	15.50 Aaa	4.75 Bbb	1.25 Cac
Time Y (9 h)
0 cycles	16.25 Aaa	7.25 Aab	1.0 Aac
1 cycle	16.25 Aaa	5.75 Abb	2.50 Aac
2 cycles	15.0 Aaa	5.25 Bbb	2.50 Aac
3 cycles	14.50 Aaa	8.25 Aab	3.0 Bac
Time Z (13 h)
0 cycles	16.25 Aaa	7,25 Aab	1.0 Abc
1 cycle	15.75 Aaa	5.0 Abb	2.25 Aac
2 cycles	14.50 Aba	7.50 Aab	3.50 Abc
3 cycles	14.0 Aba	8.0 Aab	4.75 Aac

Time X (3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	15.50 Aaa	5.25 Abb	3.50 Aab
1 cycle	17.25 Aaa	12.0 Aab	3.50 Aac
2 cycles	17.25 Aaa	5.0 Bbb	-
3 cycles	14.25 Aaa	6.75 Bbb	6.25 Aab
Time Y (9 h)
0 cycles	15.50 Aaa	5.25 Abb	3.50 Abb
1 cycle	18.25 Aaa	13.0 Aab	6.75 Aac
2 cycles	15.75 Aaa	5.25 Bbb	8.25 Aab
3 cycles	16.25 Aaa	12.25 Aab	7.25 Aac
Time Z (13 h)
0 cycles	15.50 Aaa	5.25 Abb	3.50 Aab
1 cycle	18.75 Aaa	7.0 Bbb	7.0 Aab
2 cycles	16.25 Aaa	8.75 Abb	7.75 Aab
3 cycles	15.50 Aaa	12.75 Aaa	5.25 Aab

Time X (3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	0.39 Aaa	0.10 Aab	0.01 Aac
1 cycle	0.34 Aba	0.05 Bbb	0.01 Aac
2 cycles	0.36 Aaa	0.01 Bcb	-
3 cycles	0.33 Aba	0.11 Bab	0.01 Bac
Time Y (9 h)
0 cycles	0.39 Aaa	0.10 Abb	0.01 Aac
1 cycle	0.36 Aaa	0.12 Abb	0.01 Aac
2 cycles	0.37 Aaa	0.12 Abb	0.02 Aac
3 cycles	0.35 Aaa	0.16 Aab	0.03 Aac
Time Z (13 h)
0 cycles	0.39 Aaa	0.10 Acb	0.01 Abc
1 cycle	0.34 Aba	0.08 Bcb	0.01 Abc
2 cycles	0.36 Aba	0.12 Abb	0.03 Abc
3 cycles	0.34 Aba	0.16 Aab	0.06 Aac

Time X(3 h 30)	0.0 MPa	-0.2 MPa	-0.4 MPa
0 cycles	0.14 Aaa	0.05 Abb	0.01 Aac
1 cycle	0.13 Aaa	0.03 Bcb	0.01 Aac
2 cycles	0.14 Aaa	0.01 Bdb	-
3 cycles	0.11 Aba	0.07 Bab	0.01 Bac
Time Y (9 h)
0 cycles	0.14 Aaa	0.05 Adb	0.01 Abc
1 cycle	0.14 Aaa	0.08 Abb	0.02 Aac
2 cycles	0.13 Aba	0.06 Acb	0.02 Aac
3 cycles	0.12 Aba	0.10 Aab	0.02 Aac
Time Z (13 h)
0 cycles	0.14 Aaa	0.05 Acb	0.01 Acc
1 cycle	0.14 Aaa	0.07 Abb	0.01 Acc
2 cycles	0.12 Aba	0.07 Abb	0.02 Abc
3 cycles	0.12 Aba	0.09 Aab	0.04 Aac