Initiation of breeding programs for three species of Corymbia: Introduction and provenances study

Silva, Paulo H.M. da; Lee, David J.; Amancio, Marcos R.; Araujo, Marcio J.

doi:10.1590/1984-70332022v22n1a01

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ARTICLE • Crop Breed. Appl. Biotechnol. 22 (1) • 2022 • https://doi.org/10.1590/1984-70332022v22n1a01 copy

Initiation of breeding programs for three species of Corymbia: Introduction and provenances study

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this study was to establish populations to start the breeding program of three species of Corymbia that are not widely planted in Brazil yet. To this end, basic density, bark content and growth of seedlots/provenances were evaluated three years after planting. The experiments consisted of 14 treatments for Corymbia citriodora subsp. variegata (CCV), 15 for C. maculata (CM), and five for C. henryi (CH). The species exhibited high survival, indicating adaptation to the Cwa climate while average coefficients of determination of seedlots exhibited intermediate values. The CCV from the Richmond Range (28º 55’ S) exhibited the highest productivity. The mean annual increment was low (22 to 26 m³ha^-1), but the basic density (573 to 613 kg m^-³) was high compared to the standard for eucalypts in Brazil. The bark content was close to 15% and varied between and within species.

Keywords:
Bark content; basic density; growth; new species; provenance effect

Species	Source/ Provenance	Seedlot CSIRO (number of mother trees)	Latitude (S)	Longitude (E)	Altitude (m)
CCV	Barakula SF	19664 (11)	26º 16’	150º 32’	300
	Leyburn SF	20420 (8)	28º 02’	151º 37’	500
	Monto SF	19694 (9)	24º 49’	150º 56’	475
	Mount Moffat NP	19666 (10)	24º 53’	147º 59’	1000
	Murphy Range	19691 (10)	25º 17’	149º 11’	420
	Paddys Land	20396 (16)	30º 14’	152º 1’	1100
	Quaid Rd N QLD*	21110 (15)	16º 45’	145º 26’	500
	Richmond Range	20596 (10); 20582 (57); 20597 (57); 20583 (10)	28º 55’	152º 44’	350
	Saddler Springs	19665 (15)	25º 06’	148º 04’	700
	Woondum**	1122	26º 25’	152º 73’	-
	Woondum	19426	26º 25’	152º 73’	-
CM	Barclays Deniliquin***	20541 (41); 20658 (19); 20772 (25); 20884 (13)	35º 29’	145º 14’	100
	Bodalla SF	19422 (10); 20598 (12)	36º 16’	150º 01’	60, 100
	Bunyip VIC	21069 (12)	38º 03’	145º 42’	100
	Holbrook***	20662 (5); 21004 (8)	35º 32’	147º 23’	343
	Mystery Bay	20599 (15)	36º 17’	150º 06’	60
	Southern NSW	20997 (33); 21061 (48); 21062 (22); 21141 (52); 21154 (4)	36º 01’	146º 13’	165
CH	Barclays Deniliquin***	20786 (7); 20664 (5); 20539 (9)	35º 29’	145º 14’	100
CH	Holbrook***	21040 (9); 20663 (4)	35º 32’	147º 23’	-

Species		CCV	CM	CH
Species		Before Thinning
Survival (%)		95	96	96
DBH (SD)		8.33 (3.56) / 10.84 (1.43)	8.57 (2.08) / 11.03 (1.32)	8.67 (3.35) / 10.90 (1.35)
HT (SD)		10.95 (3.89) / 12.97 (1.21)	11.00 (2.48) / 12.94 (1.22)	11.15 (3.77) / 12.80 (1.67)
VOL (SD)		0.028 (0.020) / 0.048 (0.013)	0.029 (0.021) / 0.056 (0.0182)	0.032 (0.024) / 0.055 (0.019)
MAI of population (m³ha^-1y^-1)/ MAI of selected trees		22.74 / 39.30	23.78 / 46.05	26.14 / 44.84
F		0.49	0.45	0.46
		After thinning
Selection differential (Selection Intensity)	DBH	2.28 (0.80)	2.27 (0.83)	2.43 (0.86)
	HT	2.10 (0.80)	2.15 (0.83)	2.24 (0.86)
	VOL	0.02 (0.80)	0.02 (0.83)	0.02 (0.86)

Trait	Deviance	Species
Trait	Deviance	CCV	CH	CM
DBH	LRT_seedlot	5.38*	0.38	0.10
DBH	LRT_plot	12.02*	0	4.94*
HT	LRT_seedlot	3.82	0.69	2.28
HT	LRT_plot	21.65*	2.85	2.77
VOL	LRT_seedlot	3.81	0.18	0.08
VOL	LRT_plot	23.60*	0.14	15.58*

Position	Seedlot	Provenance	g	u + g
Corymbia citriodora subsp. Variegate
1	20596	Richmond Range	g	u + g	0.799	9.124
2	20582	Richmond Range	0.375	8.700
3	20597	Richmond Range	0.278	8.603
4	20583	Richmond Range	0.198	8.523
5	19426	Woondum and Wondai	0.136	8.461
6	19665	Saddler Springs	0.038	8.363
7	19691	Murphy Range	0.022	8.347
8	1122	Woondum	-0.016	8.309
9	19666	Mount Moffat NP	-0.028	8.298
10	19694	Monto SF	-0.087	8.239
11	20420	Leyburn S.F.	-0.163	8.162
12	19664	Barakula SF	-0.249	8.076
13	20396	Paddys Land	-0.629	7.697
14	21110	Quaid Rd N QLD	-0.698	7.627
Corymbia maculate
1	20658	Barclays Deniliquin	0.111	8.685
2	20599	Mystery Bay	0.066	8.640
3	21141	Southern NSW	0.051	8.624
4	20884	Barclays Deniliquin	0.037	8.611
5	20662	Holbrook	0.029	8.603
6	20541	Barclays Deniliquin	0.017	8.591
7	20772	Barclays Deniliquin	-0.003	8.571
8	21154	Southern NSW	-0.008	8.566
9	21004	Holbrook	-0.011	8.563
10	21061	Southern NSW	-0.025	8.549
11	20997	Southern NSW	-0.030	8.544
12	21062	Southern NSW	-0.032	8.542
13	21069	Bunyip VIC	-0.043	8.530
14	20598	Bodalla SF	-0.047	8.527
15	19422	Bodalla SF	-0.111	8.463
Corymbia henryi
1	20664	Barclays Deniliquin	0.189	8.856
2	20786	Barclays Deniliquin	-0.016	8.651
3	20663	Holbrook	-0.027	8.641
4	20539	Barclays Deniliquin	-0.039	8.629
5	21040	Holbrook	-0.051	8.616

Parameters	CCV			CM			CH
Parameters	DBH (cm)	HT (m)	VOL (m³)	DBH (cm)	HT (m)	VOL (m³)	DBH (cm)	HT (m)	VOL (m³)
${\hat{σ}}_{p l o t}^{2}$	0.546	0.646	6.10E-05	0.312	0.204	4.50E-05	0.018	0.263	5.00E-06
${\hat{σ}}_{S e e d l o t}^{2}$	0.251	0.174	1.70E-05	0.023	0.111	2.00E-06	0.029	0.064	2.00E-06
${\hat{σ}}_{e}^{2}$	7.241	5.995	5.08E-04	7.065	6.278	5.26E-04	6.346	5.408	5.35E-04
${\hat{σ}}_{p}^{2}$	8.038	6.815	5.86E-04	7.400	6.594	5.73E-04	6.393	5.735	5.42E-04
${\hat{c}}_{S e e d l o t}^{2}$	0.031	0.026	0.028	0.003	0.017	3.21E-03	0.005	0.011	3.36E-03
$C_{S e e d l o t}^{2}$	0.641	0.557	0.573	0.169	0.547	0.145	0.310	0.445	0.236

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