Clonal selection of middle/large diameter timber of Eucalyptus urophylla ×E. tereticornis hybrid clones

doi:10.3969/j.issn.1000-2006.201904005

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (2): 43-50.doi: 10.3969/j.issn.1000-2006.201904005

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Clonal selection of middle/large diameter timber of Eucalyptus urophylla ×E. tereticornis hybrid clones

ZHU Xianliang¹^,²(), LAN Jun³, WANG Jianzhong³, WENG Qijie¹, ZHOU Changpin¹, GAN Siming¹, LI Fagen¹^,^*()

1. Key Laboratory of National Forestry and Grassland Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, China
2. College of Forestry, Nanjing Forestry University, Nanjing 210037, China
3. Guangxi Dongmen State Forest Farm, Fusui 532108, China

Received:2019-04-02 Revised:2019-10-09 Online:2020-03-30 Published:2020-04-01
Contact: LI Fagen E-mail:1099418037@qq.com;lifagen@caf.ac.cn

Abstract

Abstract:

【Objective】Eucalyptus species are widely planted in south China because of their large trunk diameter, superior growth and desirable wood properties.Because of their shorter cultivation period and high economic benefits, cultivating Eucalyptus trees with large trunk diameters can effectively increase the supply of medium/large diameter timber, which is in high demandin China. However, the research on Eucalyptus cultivation in China has started recently, and most of this research focused on the forest management and silvicultural technology ofEucalyptus. The number of studies on high-quality breeding and selection is currently low, and only a few Eucalyptus species used for plantations have been investigated.In this study, we investigated the genetic variation of Eucalyptus clones with the goal of selecting superior clones with medium/large diameter timber and providing the basis for further breeding selection.【Method】In this research, the growth traits of 154 twelve-year-old hybrid clones of E. urophylla×E. tereticornis were investigated, in an experimental plantation in Gonghe Town, Heshan City, Guangdong Province. Wood properties,such as basic density, cellulose content, hemicellulose content, lignin content, lignin syringyl-to-guaiacyl ratio, and fiber length-to-width ratio of eight-year-old plants were also analyzed. Genetic analyses of growth traits and wood properties included the analysis of variance and correlation and the analysis of genetic parameters. Principal component analysis was performed in order to classify the investigated hybrid clones, and comprehensive multiple trait selection was applied for the medium/large diameter timber.【Result】① The differences among the growth traits and wood properties of different clones were significant, increasing the potential for screening high-quality large diameter timber clones ofE. urophylla×E. tereticornis. ② Selection of medium/large diameter timber hybrid clones of E. urophylla×E. tereticornis was not recommended at the early stage because of the low correlation results of growth traits between plants in earlier and later stages. The optimal selection time was from 4.5 to 6.5 years and this was better than selection after 1-3 years because using selection in the early stages,it is possible to exclude some important varieties too early. ③ The effect of growth traits to select wood basic density was positive, and the effect of height was the highest in the indirect trait selection experiment. ④ We observed that the clonal repeat ability of all traits was greater than that of an individual, with the clona land individual repeat ability results of 56.28%-85.34% and 24.35%-59.27%. The traits of the clones were genetically stable and were highly regulated by their genetic background. ⑤ The hybrid clones ofE. urophylla×E. tereticornis were classified into four groups by the principal component analysis. Ten superior clones were selected with the selection rate of 6% and their genetic gain of growth traits was 14.64%-73.89%. The results showed that average height, diameter, volume and basic density of the 487 clones were 27.5 m, 27.6 cm, 0.719 7 m³ and 0.529 3 g/cm³, respectively.【Conclusion】The results of the cultivation experiment of E. urophylla×E. tereticornis hybrid clones showed that the clones had an appropriate medium diameter timber and had the potential for cultivation as a large diameter timber tree. The ten selected superior clones could be utilized in plantation areas similar to the ones in this study with the goal of the production of large diameter timber. This production could be achieved under the following environmental conditions: thick soil layer, loose and fertile soil, and sufficient water and heat. This study was based on only 154 clones of a single hybrid, and further research is needed to clonal selection. Future studies should consider combining genetic linkage maps, QTL mapping, and using clones from more hybrids and locations in order to analyze the complex genetic background explaining the growth traits and wood properties of E. urophylla×E.tereticornis hybrid clones.

Key words: Eucalyptus urophylla × E. tereticornis, middle/large diameter timber, basic density, clonal selection, principal component analysis

CLC Number:

S722.5

ZHU Xianliang, LAN Jun, WANG Jianzhong, WENG Qijie, ZHOU Changpin, GAN Siming, LI Fagen. Clonal selection of middle/large diameter timber of Eucalyptus urophylla ×E. tereticornis hybrid clones[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(2): 43-50.

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References 35

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项目 item	H/m	D_DBH /cm	V/m³	ρ_BD/ (g·cm^-3)	w_C/%	w_H/%	w_L/%	m(S)∶ m(G)	r_L/W
平均值mean	22.58	18.57	0.321 79	0.508 6	45.18	20.52	28.09	2.035	59.57
标准差SD	4.14	5.33	0.201 33	0.036 8	1.86	1.68	0.95	0.367	5.50
最小值min.	8.00	7.50	0.029 20	0.311 0	38.20	14.40	22.80	0.950	45.4
最大值max.	28.60	31.70	0.898 30	0.577 0	50.70	27.10	30.60	2.960	83.0
表型变异系数/% phenotype coefficient of variation	18.30	28.70	62.600 00	7.200 0	4.10	8.20	3.40	18.000	9.20

性状 traits	无性系clone		区组block
性状 traits	均方 mean square	F	均方 mean square	F
H	38.059	4.73^**	4.646	0.58
D_DBH	57.520	3.88^**	132.555	8.95^**
V	0.084	4.04^**	0.113	5.46^**
ρ_BD	0.002	2.82^**	0.002	2.89^*
w_C	6.314	3.33^**	12.379	6.53^**
w_H	4.486	2.23^**	5.656	2.82^*
w_L	1.494	2.53^**	1.736	2.94^*
m(S)∶m(G)	0.314	5.83^**	0.200	3.71^*
r_L/W	46.373	2.06^**	30.780	1.37

性状 traits	H	D_DBH	V	ρ_BD	w_C	w_H	w_L	m(S)∶ m(G)	r_L/W
H		0.909^**	0.880^**	0.634^**	0.312^**	-0.451^**	0.296^**	-0.183^*	-0.147
D_DBH	0.827^**		0.999^**	0.572^**	0.137	-0.542^**	0.132	-0.180^*	0.009
V	0.831^**	0.977^**		0.531^**	0.138	-0.470^**	0.142	-0.224^**	-0.016
ρ_BD	0.516^**	0.398^**	0.392^**		0.392^**	-0.654^**	0.093	0.071	-0.309^**
w_C	0.217^**	0.044	0.057	0.398^**		-0.067	0.594^**	-0.263^**	-0.001
w_H	-0.334^**	-0.324^**	-0.311^**	-0.463^**	-0.157^**		0.372^**	-0.324^**	0.285^**
w_L	0.070	-0.018	-0.010	0.049	0.483^**	0.339^**		-0.436^**	0.173^*
m(S)∶m(G)	-0.149^**	-0.253^**	-0.259^**	0.025	0.176^**	-0.386^**	-0.222^**		-0.173^*
r_L/W	-0.040	-0.062	-0.066	0.082	-0.085	0.092	-0.013	-0.262^**

变量 variation	遗传变异系数 genetic coefficient of variation	无性系重复力 clone repeatability	单株重复力 individual repeatability
H	13.33	82.01	53.26
D_DBH	19.26	77.81	46.71
V	42.42	78.64	47.93
ρ_BD	4.24	69.12	35.88
w_C	2.57	74.04	41.62
w_H	4.23	60.07	27.33
w_L	1.86	64.92	31.63
m(S)∶m(G)	13.76	85.34	59.27
r_L/W	4.52	56.28	24.35

因子 factor	主成分 principal components
因子 factor	第1 PRIN1	第2 PRIN2	第3 PRIN3	第4 PRIN4
H	0.914	0.097	-0.002	-0.062
D_DBH	0.920	0.179	-0.213	-0.155
V	0.919	0.189	-0.202	-0.163
ρ_BD	0.661	-0.222	0.294	0.407
w_C	0.270	-0.153	0.865	0.067
w_H	-0.508	0.700	0.099	-0.205
w_L	0.027	0.475	0.777	-0.147
m(S)∶m(G)	-0.145	-0.852	0.148	-0.085
r_L/W	-0.057	0.349	-0.110	0.877
特征根latent root	3.319	1.714	1.568	1.064
贡献率/%contribution rate	36.882	19.044	17.419	11.819
累计贡献率/% accumulative contribution rate	36.882	55.927	73.346	85.165

Clonal selection of middle/large diameter timber of Eucalyptus urophylla ×E. tereticornis hybrid clones

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排名 rank	第1主成分PRIN1		第2主成分PRIN2
排名 rank	无性系号 clone ID	y₁	无性系号 clone ID	y₂
1	497	5.394 0	536	3.684 0
2	680	5.202 3	269	3.385 2
3	298	4.973 9	765	3.010 4
4	1037	4.615 6	589	2.732 8
5	484	4.349 7	673	2.686 9
6	963	4.130 5	511	1.995 1
7	300	4.085 1	797	1.988 1
8	956	3.895 3	913	1.922 9
9	244	3.712 1	268	1.903 3
10	506	3.606 7	967	1.890 0
11	1004	3.544 3	428	1.778 6
12	890	3.528 7	783	1.707 0
13	1022	3.520 0	436	1.692 7
14	931	3.428 8	927	1.687 1
15	861	3.353 1	899	1.642

排名 rank	无性系号 clone ID	H/m	D_DBH /cm	V/m³	ρ_BD/ (g·cm^-3)	w_C/%	w_H/%	w_L/%	m(S)∶ m(G)	r_L/W
1	497	27.5	27.6	0.719 7	0.529	45.3	19.2	28.3	1.48	59.4
2	680	26.6	26.5	0.644 6	0.541	46.0	18.2	28.3	1.66	59.5
3	298	27.5	25.5	0.623 7	0.533	45.6	17.3	26.6	2.35	55.7
4	1 037	26.6	26.5	0.641 9	0.513	46.4	18.1	28.4	2.29	54.6
5	484	27.0	27.7	0.704 0	0.506	45.8	20.6	28.4	1.79	60.5
6	963	26.7	24.3	0.551 0	0.551	45.2	18.9	28.4	2.18	56.3
7	300	26.1	25.2	0.585 5	0.539	45.7	19.0	28.2	2.22	59.8
8	956	25.3	26.9	0.653 1	0.534	43.3	20.1	27.5	2.01	55.4
9	244	26.6	25.1	0.599 0	0.523	44.5	19.8	28.0	1.72	62.1
10	506	26.2	23.5	0.519 1	0.532	45.8	18.1	27.4	2.39	55.6
入选平均值selected mean		26.61	25.88	0.6241 6	0.530	45.36	18.93	27.93	2.010	57.89
遗传增益genetic gain		14.64	30.39	73.89	2.92	0.30	-4.64	-0.34	-1.05	-1.61
占总均值百分比percent of the population mean		117.85	139.06	193.97	104.23	100.41	92.27	99.47	98.77	97.15

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