DORMANCY OVERCOMING AND PRECONDITIONING IN <i>Mimosa caesalpiniifolia</i> Benth. SEEDS

MEDEIROS, HOHANA LISSA DE SOUSA; BENEDITO, CLARISSE PEREIRA; DANTAS, NADJAMARA BANDEIRA DE LIMA; COUTO JÚNIOR, JORGE RICARDO SILVA DO; RAMALHO, LUIRLA BENTO

doi:10.1590/1983-21252020v33n315rc

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Forest Science • Rev. Caatinga 33 (3) • Jul-Sep 2020 • https://doi.org/10.1590/1983-21252020v33n315rc copy

DORMANCY OVERCOMING AND PRECONDITIONING IN Mimosa caesalpiniifolia Benth. SEEDS

SUPERAÇÃO DE DORMÊNCIA E PRÉ-CONDICIONAMENTO EM SEMENTES DE Mimosa caesalpiniifolia Benth.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Seeds of ‘sabiá’ (Mimosa caesalpiniifolia Benth.) have coat dormancy, which hampers the absorption of water and oxygen, thereby delaying germination. Thus, this study aimed to evaluate methods for overcoming dormancy associated with priming on germination and vigor of seeds of ‘sabiá’, considering the efficiency, practicality and cost of treatment. The experimental design was completely randomized, in a 4 x 5 factorial scheme (four methods for overcoming dormancy x five types of priming), constituting 20 treatments with four replicates of 25 seeds. The methods for overcoming dormancy used were tip removal, seed immersion in hot water at 100 °C for three minutes, immersion in sulfuric acid for 10 minutes and intact seeds. For the determination of physiological conditioning of seeds, the imbibition curve with the different priming agents was constructed. Priming was done on filter paper moistened with solutions of mannitol at the potentials of -0.2 MPa (16 hours), -0.4 MPa (24 hours) and -0.6 MPa (36 hours) and only with distilled water for the hydropriming (12 hours) and seeds without priming. The variables analyzed were first count of germination, germination, root length, shoot length and dry weight of seedlings. The data were subjected to analysis of variance by F test and Tukey test at 5% probability. The dormancy of M. caesalpiniifolia seeds should be overcome with the use of hot water (100 °C) for three minutes, without the need for priming.

Keywords:
Fabaceae; Caatinga; Forest seeds; Dormancy; Priming

Level (MPa^* * 1 MPa= 10 bar; 1 bar= 0.987 atm. )	Mannitol (g L^-1)
0.00	0.00
-0.2 MPa	14.7
-0.4 MPa	29.4
-0.6 MPa	44.1

Sources of variation	DF	FC	G	RL	SL	DWS
Priming (P)	4	6.79^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	8.12^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	27.14^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	9.31^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	6.61^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.
Overcoming dormancy (OD)	3	507.02^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	435.64^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	9.20^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	6.25^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	19.24^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.
P x OD	12	5.096^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	4.51^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	0,249n.s	2.22^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.	2.49^* * significant at 5% probability by the F test. n.s not significant at 5% probability by F.
CV		9.91	9.78	17.14	9.43	14.68
Mean		69	71.0	3.47	4.67	0.2378

First count (%)
Priming		Methods for overcoming dormancy
Priming	Intact	Hot water	Sulfuric acid	Tip removal
Without priming	13 AC	87 aA	74 bB	86 abAB
Hydropriming	19 AC	83 aB	97 aA	98 aA
Mannitol -0.2 MPa	21 aB	88 aA	91 aA	87 AbA
Mannitol -0.4 MPa	13 AC	69 bB	91 aA	83 bA
Mannitol -0.6 MPa	24 AC	67 bB	94 aA	99 aA
		Germination (%)
Without priming	18 abB	87 aA	75 bA	86 aA
Hydropriming	23 abB	87 aA	97 aA	99 aA
Mannitol -0.2 MPa	30 aB	92 aA	92 aA	89 aA
Mannitol -0.4 MPa	16 abC	71 bB	91 aA	86 aA
Mannitol -0.6 MPa	28 abC	69 bB	94 aA	99 aA

Priming	Root length (cm)
Without priming	2.67 c
Hydropriming	4.67 a
Mannitol -0.2 MPa	3.11 c
Mannitol -0.4 MPa	3.00 c
Mannitol -0.6 MPa	3.89 b

Overcoming dormancy	Root length (cm)
Intact	2.85 b
Tip removal	3.57 a
Sulfuric acid	3.71 a
Hot water	3.73 a

Shoot length (cm)
Priming		Methods for overcoming dormancy
Priming	Intact	Hot water	Sulfuric acid	Tip removal
Without priming	3.73 bB	4.15 aAB	4.16 bAB	4.83 aA
Hydropriming	4.25 bB	4.86 aAB	4.85 abAB	5.09 aA
Mannitol -0.2 MPa	4.14 bB	4.82 aAB	5.12 aA	4.65 aAB
Mannitol -0.4 MPa	5.42 aA	5.02 aA	4.94 abA	5.18 aA
Mannitol -0.6 MPa	4.39 b AB	4.21 aB	4.38 abAB	5.18 aA
	Dry weight of seedlings (g)
Without priming	0.064 aB	0.284 abA	0.245 cA	0.301 aA
Hydropriming	0.0817 aB	0.293 abA	0.332 aA	0.335 aA
Mannitol -0.2 MPa	0.0980 aB	0.309 aA	0.318 abA	0.299 aA
Mannitol -0.4 MPa	0.055 aB	0.227 bcA	0.262 bcA	0.282 aA
Mannitol -0.6 MPa	0.090 aC	0.213 cB	0.321 abA	0.341 aA

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