Genetic variability and <i>ex situ</i> conservation strategies for the neotropical tree <i>Parkia platycephala</i> Benth.

Silva, Dandara Yasmim Bonfim de Oliveira; Farias, Séfora Gil Gomes de; Resende, Rafael Tassinari; Cardoso, Clarice Ribeiro; Silva, Romário Bezerra e; Tambarussi, Evandro Vagner

doi:10.5902/1980509864058

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Artigos • Ci. Fl. 33 (1) • 2023 • https://doi.org/10.5902/1980509864058 copy

Genetic variability and ex situ conservation strategies for the neotropical tree Parkia platycephala Benth.

Variabilidade genética e estratégias de conservação ex situ para a espécie neotropical Parkia platycephala Benth.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Parkia platycephala, known commonly as faveira, is a native species that occurs widely throughout Brazil and has high nutritional value and ecological potential. The objective of this study was to estimate the genetic variability in a P. platycephala provenance and progeny test. The test was established using a randomized block design, with 45 progenies from three provenances. The evaluated quantitative traits included height (HEI), diameter at ground level (DGL), and diameter below the first bifurcation (DFB). The data were submitted to Restricted Maximum Likelihood/Best Linear Unbiased Prediction (REML/BLUP) analysis, from which estimates of genetic parameters, genetic correlations, BLUPs, genetic gains, and effective population size were obtained. Estimates of individual narrow sense heritability ( $h_{a}^{2}$ ) and within progeny heritability ( $h_{w}^{2}$ ) ranged from low to moderate (0.01 a 0.39), with the highest values observed for DGL (0.32 and 0.39, respectively). The coefficient of individual variation (CV_gi_(%)) and between progeny genetic variation (CV_gp_(%)) indicate the existence of genetic variability between and within provenances. The F_ST values demonstrate low to moderate genetic differentiation among the three populations, and genetic correlations between traits were all positive and significant. The results obtained show that there is genetic variability between the studied provenances and progenies. This ensures not only the ex situ conservation of the species, but it can also be exploited in breeding programs.

Keywords
Genetic resources; Faveira; Forest resources; Genetic parameters

Pop. as random effect	LRT (ꭕ²)
Pop. as random effect	HEI	DGL	DFB
Population	1.55^ns	6.41^* * p <0.05;	7.87^ p <0.01;
Progeny	0.25^ns “ns” not significant.	0.43^ns “ns” not significant.	0.00^ns “ns” not significant.
Block	35.75^* ***** p <0.001;	17.08^* ***** p <0.001;	1.58^ns “ns” not significant.
Pop. as fixed effect
Population	2.96^ns “ns” not significant.	7.14^ p <0.01;	7.11^ p <0.01;
Progeny	0.24^ns “ns” not significant.	0.42^ns “ns” not significant.	0.00^ns “ns” not significant.
Block	35.83^* ***** p <0.001;	17.10^* ***** p <0.001;	1.58^ns “ns” not significant.

Population assumed to be a random effect	HEI (m)			DGL (mm)			DFB (mm)
$σ_{p o p}^{2}$	59.70			9.46			11.45
$σ_{a}^{2}$	620.01			32.10			47.63
$σ_{bloc}^{2}$	551.82			15.53			4.87
$σ_{e}^{2}$	3040.29			154.55			221.04
$σ_{f}^{2}$	4271.82			211.64			284.99
$h_{a}^{2}$	0.14 ± 0.021			0.15 ± 0.021			0.17 ± 0.021
$h_{d}^{2}$	0.15			0.16			0.16
CV_gi(%)	8.01			8.84			12.18
CV_gp(%)	4.00			4.42			6.09
CV_e(%)	17.75			19.40			26.25
$\hat{b}$	0.22			0.23			0.23
${\hat{r}}_{a a}$	0.63			0.63			0.64
F_st	0.05			0.13			0.11
Average	3.11			64.09			56.65
Population assumed to be fixed effect	Population
Population assumed to be fixed effect	1	2	3	1	2	3	1	2	3
$σ_{a}^{2}$	578.44	1244.99	28.13	0.002	69.42	74.67	5.26	92.75	84.35
$σ_{bloc}^{2}$	503.32			17.19			5.50
$σ_{e}^{2}$	3075.03			142.81			211.69
$σ_{f}^{2}$	4156.79	4823.34	3606.48	160.00	229.42	234.67	222.46	309.95	301.54
$h_{r}^{2}$	0.14 ± 0.099	0.26 ± 0.082	0.01 ± 0.121	0.00001 ± 0.133	0.30 ± 0.079	0.32 ± 0.074	0.02 ± 0.138	0.30 ± 0.084	0.28 ± 0.085
$h_{w}^{2}$	0.14	0.30	0.01	0.00001	0.36	0.39	0.02	0.33	0.30
CV_gi(%)	7.74	11.36	1.71	0.07	13.00	13.48	4.05	17.00	16.21
CV_gp(%)	3.87	5.68	0.85	0.03	6.50	6.74	2.02	8.50	8.10
CV_e(%)	17.89	18.41	17.36	19.36	19.09	17.65	27.17	26.15	24.00
$\hat{b}$	0.22	0.32	0.01	0.02	0.35	0.36	0.08	0.33	0.31
${\hat{r}}_{a a}$	0.61	0.75	0.17	0.01	0.78	0.79	0.27	0.77	0.75
Average	3.10	3.01	3.19	61.71	62.59	67.72	53.54	55.63	60.61
Correlations
Trait	HEI			DGL			DFB
HEI	-			0.66**			0.49**
DGL	0.64**			-			0.80**
DFB	0.48**			0.78**			-

Universidade Federal de Santa Maria Av. Roraima, 1.000, 97105-900 Santa Maria RS Brasil, Tel. : (55 55)3220-8444 r.37, Fax: (55 55)3220-8444 r.22 - Santa Maria - RS - Brazil
E-mail: cienciaflorestal@ufsm.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Dandara Yasmim Bonfim de Oliveira Silva

MSc. in Forest Science, Researcher