Performances and selections on a 12-year-old full-sib progeny testing from one of the candidate population for the 4th generation Chinese fir breeding

doi:10.12302/j.issn.1000-2006.202206050

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (6): 240-250.doi: 10.12302/j.issn.1000-2006.202206050

Special Issue: 南京林业大学120周年校庆特刊

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Performances and selections on a 12-year-old full-sib progeny testing from one of the candidate population for the 4th generation Chinese fir breeding

YE Daiquan()

Yangkou National Forest Farm of Fujian Province, Shunchang 353200, China

Received:2022-06-08 Revised:2022-10-29 Online:2022-11-30 Published:2022-11-24

Abstract

Abstract:

【Objective】To develop new genetic resourese and establishment techniques of the next generation seed orchard, the 4th generation candidate genetic populations of chinese fir (Cunninghamia lanceolata) (which was one part of the long term Genetic Improvement Program of Chinese fir, organized by the Nanjing Forestry University-Fujian Province Cooperative)were created by a series of planed intraspecific crossing, and then the full-sib progeny testing and traits evaluation has been conducted continuously, since 2006. The establishment of the 4th generation orchard for seed production were initiated in 2016. In this study, a 12-year-old full-sib progeny testing was investigated and analyzed systematically, to provide detail genetic information and excellent parents selected for the 4th generation seed production orchard. 【Method】The tree height of 1-12 a, diameter at breast height (DBH) of 4, 5, 6, 9 and 12 a of full-sib progeny testing was measured, and the average volume per tree by family was calculated. The best individual trees within all the family plot were selected, and the wood increment core samples were collected at DBH (1.3m) to determine basic wood density and dark-brown heartwood proportion. The annual mean value and coefficient of variation on growth traits were used to evaluate the stability of family growth traits. The genetic variance and heritability was estimated for all observed traits. The effects of different stand ages, different effects of selection proportion and early selection on the accuracy and genetic gain was compared year by year, respectively. Finally, the excellent full-sibling families and superior individual trees within the family was selected and the genetic gain to be predicted, combining with their single tree volume and wood character.【Result】1) The results showed that the family mean of the tree height, DBH, volume growth (single tree), wood basic density and the proportion of dark-brown heartwood was 12.63 m, 15.2 cm, 0.136 8 m³, 0.328 0 g/cm³ and 40.76%, respectively. The genetic variance was extremely significant statistically for all the characters in the testing, and it was means that the true genetic differences was existed in the 4th candidate populations. 2) The family narrow heritability was 0.246, 0.358 and 0.329 for tree height, DBH and single tree volume, and it was 0.464, 0.687 and 0.680 for re-selected elite trees, respectively. Based on the optimization benchmark of volume growth, and basic wood density and the proportion of dark-brown heartwood, 10 excellent families and 19 elite trees within the family were selected. 3) The mean was 13.34 m, 17.0 cm, 0.176 3 m³, 0.320 2 g/cm³ and 40.76% for tree height, DBH, single tree volume, wood basic density and proportion of dark-brown heartwood of selected family, respectively. The volume genetic gain was 6.14%-21.60% for selected families, and 58.62%-178.20% for 19 excellent single trees. The mean of wood basic density was 0.363 3 g/cm³ for selected families, and 0.476 4 g/cm³ for the best selected individual. It was increased by 10% and 12.78% over the family mean for basic wood density and proportion of dark-brown heartwood traits. 4)The stability of tree height, DBH and volume growth, effects of selection proportion on genetic gain, early-later correlation of volume growth and early selection ages was also analyzed comprehensively. Setting volume growth as a comprehensive trait of tree height and DBH, and family selection proportion at 15%, the conformity degree of the selected family and the genetic gain for volume growth was the highest at 12 a, whatever the early selection was processed in 4, 5 or 6 a. This indicates that the early selection based on the volume growth performance of juvenile plantation, is not only feasible and effective in the 4th generation of genetic improvement of Chinese fir, but also the breeding cycle could be reduced greatly. 【Conclusion】there were abundant genetic variations on growth and wood properties from one candidate population for the 4th generation genetic improvement of Chinese fir. And these excellent families and re-selected elite individuals with a higher genetic gain in volume growth, basic wood density and proportion of dark-brown heartwood are important parental sources for the 4th generation seed orchard establishing, and also the genetic resourese of excellent clonal selection in the next rotation of genetic improvement of Chinese fir.

Key words: Chinese fir(Cunninghamia lanceolatea), the 4th generation breeding candidate population, full-sib progeny testing, genetic gain, early selection

CLC Number:

S722

YE Daiquan. Performances and selections on a 12-year-old full-sib progeny testing from one of the candidate population for the 4th generation Chinese fir breeding[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(6): 240-250.

Figures/Tables 13

Table 1

Table 2

Table 3

Variance components and narrow heritability estimated in the full-sib progeny testing"

性状 trait	家系方差 family variance	交互方差 interaction variance	误差 residual
树高 tree height	0.222 6	0.405 4	2.988 1	0.246
胸径 DBH	0.915 6	0.854 0	8.462 3	0.358
单株材积 single tree volume	0.000 4	0.000 5	0.004 1	0.329

Table 3

Table 4

Table 5

Fig.1

Table 6

Table 7

Variance components and narrow heritability of selected elites"

性状 trait	家系方差 family variance	误差 residual	$h f 2$
树高tree height	0.292 5	2.925 0	0.464
胸径DBH	1.138 2	5.484 8	0.687
单株材积single volume	0.000 8	0.004 1	0.680

Table 7

Fig.2

Table 8

Table 9

Table 10

Table 11

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性状 trait	树龄/a tree age	家系均值 family mean	家系变异系数/% family CV	家系最小值 min in family	家系最大值 max in family	对照均值 CK mean	对照变异系数/% CK CV	F
树高 tree height	1	1.04^**	27.86	0.23	1.90	0.99	28.28	3.52
	2	2.16^**	20.24	0.81	3.41	2.06	18.93	3.76
	3	3.85^**	17.16	1.33	6.04	3.77	15.92	3.85
	4	5.02^**	15.56	2.02	7.45	4.92	14.02	3.83
	5	6.46^**	14.91	3.01	10.00	6.22	14.63	3.81
	6	7.57^**	13.95	4.04	11.15	7.24	14.64	3.65
	9	10.42^**	16.68	6.01	15.34	10.01	15.68	2.26
	12	12.63^**	17.52	7.01	20.41	12.18	20.11	2.70
	4	7.1^**	24.54	0.1	13.5	6.8	22.06	2.85
	5	9.0^**	22.93	2.1	15.7	8.4	21.43	3.38
胸径DBH	6	10.6^**	23.01	3.6	19.0	9.8	20.41	3.42
	9	13.6^**	22.92	5.1	25.1	12.5	20.80	3.73
	12	15.2^**	22.35	7.2	29.8	14.4	21.53	3.84
	4	0.013 6^**	46.17	0.002 0	0.052 8	0.012 0	40.00	4.66
单株材积 single tree volume	5	0.026 9^**	46.77	0.005 1	0.102 5	0.022 9	41.48	4.37
	6	0.042 5^**	46.55	0.010 0	0.153 7	0.035 2	43.75	4.33
	9	0.091 4^**	52.01	0.015 1	0.370 0	0.074 8	49.73	3.46
	12	0.136 8^**	55.61	0.020 4	0.704 0	0.119 8	52.75	3.46

性状trait	变异来源 variation source	平方和 sum of squares	自由度 df	均方 mean square	F
树高 tree height	家系间	681.099	61	11.166	3.877^**
	重复间	2714.521	9	301.613	104.729^**
	家系×重复	2 294.261	540	4.249	1.475^**
	误差	4 605.011	1 599	2.880
胸径 DBH	家系间	2 358.426	61	38.663	4.673^**
	重复间	3 566.634	9	396.293	47.898^**
	家系×重复	6 051.565	540	11.207	1.354^**
	误差	13 229.653	1 599	8.274
单株材积 single tree volume	家系间	1.088	61	0.018	4.516^**
	重复间	2.194	9	0.244	61.756^**
	家系×重复	3.091	540	0.006	1.450^**
	误差	6.313	1 599	0.004

性状 trait	变异来源 variation source	最小值 min	最大值 max	均值 mean	标准差 SD	变异系数/% CV
木材基本密度/(g·cm^-3) wood basic density	家系间	0.292 9	0.363 3	0.328 0	0.016 0	4.88
	最优单株/ 家系内	0.242 5	0.476 4	0.359 5	0.031 1	9.48
红心材比例/% dark-brown heartwood rate	家系间	30.80	45.87	39.32	2.89	7.35
	最优单株/ 家系内	17.07	65.17	39.34	7.82	19.88

变异来源 variation source	性状trait	平方和 sum of squares	自由度 df	均方 mean sequare	F
家系family	红心材比例	0.554	63	0.009	1.551^**
	木材基本密度	0.161	63	0.003	3.557^**
重复 replication	红心材比例	0.429	9	0.048	8.405^**
	木材基本密度	0.051	9	0.006	7.861^**
残差 residual	红心材比例	3.157	557	0.006
	木材基本密度	0.399	557	0.001
总体 total	红心材比例	292.538	630
	木材基本密度	68.394	630

选择率/% selection proportion	平均材积遗传增益 average volume genetic gain
选择率/% selection proportion	4 a	5 a	6 a	9 a	12 a
10	13.60	15.34	15.68	10.01	12.13
15	11.84	13.06	13.58	9.07	10.63
20	10.56	11.63	12.24	8.44	9.62

Performances and selections on a 12-year-old full-sib progeny testing from one of the candidate population for the 4th generation Chinese fir breeding

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序号 No.	家系号 family No.	单株材积 single tree volume			树高 tree height				胸径 DBH				木材基本密度/ (g/cm^-3) basic wood density	红心材比例/% proportion of dark- brown heartwood
序号 No.	家系号 family No.	家系均值 /m³	ΔG /%		家系均值 /m		ΔG /%		家系均值 /cm		ΔG /%		木材基本密度/ (g/cm^-3) basic wood density	红心材比例/% proportion of dark- brown heartwood
1	48	0.226 6		21.60		13.89		2.45		19.1		8.72	0.318 2	40.68
2	40	0.182 3		10.94		14.24		3.13		17.1		4.19	0.300 1	42.73
3	63	0.178 1		9.93		13.58		1.83		16.4		2.56	0.327 9	37.33
4	41	0.176 4		9.51		13.77		2.28		17.0		3.91	0.329 0	45.00
5	34	0.174 5		9.06		13.10		0.90		16.3		2.31	0.326 4	41.26
6	7	0.171 6		8.37		13.51		1.71		17.1		4.08	0.321 9	37.99
7	27	0.164 3		6.61		12.89		0.49		16.5		2.79	0.342 4	38.50
8	16	0.163 7		6.46		12.47		-0.33		17.0		3.98	0.310 6	44.03
9	30	0.163 3		6.38		12.76		0.23		17.1		4.05	0.302 5	36.78
10	22	0.162 3		6.14		13.15		1.00		16.6		3.06	0.323 7	43.25
CK1	38	0.119 8				12.18				14.4			0.321 2	41.49
CK2	35	0.107 9				11.96				13.8			0.327 3	30.80
总体平均total average		0.176 3		9.50		13.34		1.37		17.0		3.97	0.320 2	40.76

序号 No.	单株号 No.of elite	树高 tree height		胸径DBH		单株材积sigle volume		木材基本密度/ (g·cm^-3) basic wood density	红心材比例/% proportion of dark-brown heartwood
序号 No.	单株号 No.of elite	值/m	ΔG /%	值/cm	ΔG /%	值/ m³	ΔG /%	木材基本密度/ (g·cm^-3) basic wood density	红心材比例/% proportion of dark-brown heartwood
1	34-6-4	20.41	21.44	29.80	45.60	0.704 0	178.20	0.324 5	54.87
2	63-9-2	19.32	17.82	28.50	40.61	0.613 8	146.67	0.325 0	50.94
3	48-7-1	17.46	11.65	26.30	32.17	0.478 5	99.35	0.330 9	39.48
4	41-8-2	17.25	10.95	26.40	32.56	0.476 9	98.78	0.311 1	48.83
5	40-6-3	18.66	15.63	24.50	25.27	0.441 7	86.47	0.290 7	42.84
6	63-6-1	17.32	11.18	25.30	28.34	0.440 1	85.93	0.298 8	37.14
7	48-6-1	17.15	10.62	25.40	28.72	0.439 7	85.76	0.329 1	41.33
8	19-1-3	17.92	13.17	24.70	26.04	0.432 8	83.37	0.378 7	43.61
9	34-8-3	16.00	6.80	25.60	29.49	0.419 6	78.74	0.362 1	34.45
10	41-9-3	16.50	8.46	24.80	26.42	0.405 2	73.70	0.363 4	48.56
11	33-8-2	16.46	8.33	24.80	26.42	0.404 3	73.39	0.313 6	47.31
12	28-9-4	16.27	7.70	24.10	23.73	0.378 2	64.25	0.276 1	44.44
13	58-7-1	16.23	7.56	24.00	23.35	0.374 2	62.88	0.330 0	45.71
14	52-9-2	17.81	12.81	23.00	19.51	0.374 0	62.81	0.337 7	58.39
15	30-8-4	17.01	10.15	23.30	20.67	0.368 2	60.78	0.326 4	42.01
16	54-1-2	18.29	14.40	22.50	17.60	0.366 8	60.29	0.310 5	42.11
17	18-1-1	18.01	13.47	22.60	17.98	0.365 0	59.64	0.294 5	29.75
18	34-9-2	17.32	11.18	23.00	19.51	0.364 8	59.58	0.313 8	46.88
19	36-1-4	16.08	7.07	23.70	22.20	0.362 1	58.62	0.278 9	48.33

观察林龄/a observation tree age	4	5	6	9	12
4	1.000	0.981^**	0.961^**	0.909^**	0.850^**
5		1.000	0.988^**	0.939^**	0.878^**
6			1.000	0.961^**	0.908^**
9				1.000	0.967^**
12					1.000