GENETIC VARIABILITY OF <i>Parkia platycephala</i> POPULATIONS: SUPPORT FOR DEFINING SEED COLLECTION AREAS<sup/>

SILVA, DANDÁRA YASMIM BONFIM DE OLIVEIRA; FARIAS, SÉFORA GIL GOMES DE; ARAUJO, POLIANA COQUEIRO DIAS; SOUSA, MOEMA BARBOSA DE; SILVA, ROMÁRIO BEZERRA E; OLIVEIRA, CAIO VARONILL DE ALMADA

doi:10.1590/1983-21252022v35n418rc

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Agronomy • Rev. Caatinga 35 (4) • Oct-Dec 2022 • https://doi.org/10.1590/1983-21252022v35n418rc copy

GENETIC VARIABILITY OF Parkia platycephala POPULATIONS: SUPPORT FOR DEFINING SEED COLLECTION AREAS¹ 1 Paper extracted from the first author's undergraduate course conclusion work.

VARIABILIDADE GENÉTICA DE POPULAÇÕES DE Parkia platycephala: SUBSÍDIO PARA DEFINIR ÁREAS DE COLETA DE SEMENTES

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Loss of genetic variability in natural populations affects negatively the adaptive and evolutive process of plant species. In this context, the objective of this work was to evaluate the existing genetic variability between and within natural populations of P. platycephala, using biometric characters of fruits and seeds and physiological characters of seeds and seedlings, and, thus, assess the potential for selection of mother trees, indicate areas for seed collection and use, and generate support for conservation and pre-breeding of plant species. A completely randomized experimental design was used, with 45 treatments (progenies) and four replications of 25 seeds. The progenies were evaluated in laboratory, using seeds collected from 45 mother trees sampled in three natural populations. The following characters were evaluated: seed germination percentage, germination speed index, and mean germination time; shoot and main root lengths; and seedling shoot and root dry weights. The data were subjected to RELM/BLUP analysis for estimating genetic parameters and correlations and to analyses of genetic divergence (UPGMA). The populations present genetic differences to each other and a significant variation between progenies for all characters evaluated, and the variation was greater within the populations. The characters evaluated present high genetic control; therefore, they can be used in analysis of genetic variability of populations and progenies of P. platycephala, thus assisting in the identification of areas for seed collection, conservation programs, and pre-breeding of the species.

Keywords
Genetic conservation; Genetic parameters; Fava de bolota; Forest restoration; Forest seeds.

	Genetic parameters
	$σ_{a}^{2}$	$σ_{pop}^{2}$	$σ_{e}^{2}$	$σ_{f}^{2}$	F_ST	$h_{r}^{2}$	$h_{mp}^{2}$	A_cprog	CV_gi	CV_gp	CV_e	$\hat{b}$	$\bar{x}$
FL	7.57^{^ significant at 1% probability level;}	---	10.50	18.07	---	0.42	0.95	0.97	20.12	10.06	23.71	0.42	13.67
FW	1.24^{^ significant at 1% probability level;}	---	0.24	1.48	---	0.84	0.99	0.99	21.90	10.95	9.60	1.14	5.09
FT	4.17^{^ significant at 1% probability level;}	---	0.92	5.09	---	0.82	0.99	0.99	41.07	20.53	19.35	1.06	4.97
TSF	44.84^{^ significant at 1% probability level;}	---	54.77	99.62	---	0.45	0.95	0.98	26.60	13.30	29.40	0.45	25.17
SL	0.66^{^ significant at 1% probability level;}	---	0.45	1.11	---	0.60	0.97	0.99	9.50	4.75	7.82	0.61	8.55
SW	1.24^{^ significant at 1% probability level;}	---	0.24	1.48	---	0.84	0.99	0.99	21.90	10.95	9.60	1.14	5.09
ST	0.85^{^ significant at 1% probability level;}	---	0.17	1.02	---	0.83	0.99	0.99	28.30	14.15	12.76	1.11	3.25
G(%)	419.70^{^ significant at 1% probability level;}	76.85^{^ significant at 1% probability level;}	39.37	535.92	0.08	0.78	0.91	0.96	21.92	10.96	6.71	1.63	93.47
GSI	2.99^{^ significant at 1% probability level;}	0.75^{^ significant at 1% probability level;}	0.20	3.93	0.11	0.76	0.94	0.97	33.38	16.70	8.60	1.94	5.18
MGT	0.25^{^ significant at 1% probability level;}	1.14^{^ significant at 1% probability level;}	0.02	1.41	0.69	0.40	0.92	0.96	10.50	5.25	3.16	1.66	4.76
SL	1.07^{^ significant at 1% probability level;}	2.02^{^ significant at 1% probability level;}	0.21	3.31	0.48	0.32	0.83	0.91	17.89	8.94	7.99	1.11	5.79
MRL	1.96^{^ significant at 1% probability level;}	0.83^{^ significant at 1% probability level;}	0.35	3.13	0.17	0.62	0.85	0.92	23.58	11.79	9.94	1.19	5.93
SDW	100.78^{^ significant at 1% probability level;}	0.51^ns ns not significa.	3.23	104.52	0.002	0.96	0.97	0.98	36.03	18.02	6.45	2.79	27.86
RDW	4.76^{^ significant at 1% probability level;}	0.11^ns ns not significa.	0.34	5.22	0.01	0.91	0.93	0.97	33.10	16.55	8.85	1.87	6.59

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[1] *Corresponding author

Brasil

Brasil

GENETIC VARIABILITY OF Parkia platycephala POPULATIONS: SUPPORT FOR DEFINING SEED COLLECTION AREAS1 1 Paper extracted from the first author's undergraduate course conclusion work.

VARIABILIDADE GENÉTICA DE POPULAÇÕES DE Parkia platycephala: SUBSÍDIO PARA DEFINIR ÁREAS DE COLETA DE SEMENTES

ABSTRACT

GENETIC VARIABILITY OF Parkia platycephala POPULATIONS: SUPPORT FOR DEFINING SEED COLLECTION AREAS¹ 1 Paper extracted from the first author's undergraduate course conclusion work.