Spatial Variation of Phenotypes of Fruit and Seed Traits of Michelia wilsonii, a Rare and Endangered Plant

doi:10.7525/j.issn.1673-5102.2023.01.011

Abstract

Abstract:

In order to provide a basis for the conservation and utilization of Michelia wilsonii natural population， the phenotypes of fruit and seed traits of M. wilsonii were analyzed， and the variation mechanism and spatial autocorrelation was studied. M. wilsonii natural population was taken as materials， which located in Zhougong Mountain， Ya’an， 12 phenotypic traits were determined. The spatial variation characteristics of fruits and seeds of M. wilsonii were explored by using coefficient of variation and semi-variogram. The results showed that：（1）The average coefficient of variation of phenotypic fruit and seed traits was 27.59%， the variation extent of morphological traits was the least， and the variation extent of seed traits was more abundant than that of fruit. （2）The seed abortion rate and follicle abortion rate were the highest in the lower part of fruit， which were 18.32% and 38.22% respectively. The seed and follicle abortion rates were lowest in the middle part of fruit， which were 15.05% and 23.45% respectively. （3）The semi-variogram models were dominated by exponential and spherical models， presenting a distribution of aggregation. Except fruit length， seed longitudinal diameter and seed abortion rate， the other nine indexes showed medium and high spatial autocorrelation respectively. （4）The anisotropy ratios of the nine indexes were close to 1， and the spatial heterogeneity was isotropy. Therefore， the phenotypic fruit and seed traits of M. wilsonii had abundant variation in the medium scale spatial range.

Key words: Michelia wilsonii, seed and fruit, phenotypic traits, semi-variogram, spatial variation

CLC Number:

Q949.747.1

Lijie CHEN, Wanyuan DANG, Weiwei CHEN, Tao QIU, Xiaohong CHEN. Spatial Variation of Phenotypes of Fruit and Seed Traits of Michelia wilsonii, a Rare and Endangered Plant[J]. Bulletin of Botanical Research, 2023, 43(1): 100-108.

Figures/Tables 7

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性状 Trait	最小值 Minimum	最大值 Maximum	平均值 Mean	标准差 Standard deviation	变异系数 Coefficient of variation /%
果实长 Fruit length /mm	109.20	240.76	169.31	30.90	18.25
果实宽 Fruit width /mm	22.36	53.17	34.32	6.50	18.95
果形指数 Fruit shape index	2.70	7.96	5.08	1.20	23.58
果实鲜质量 Fruit fresh mass /g	22.33	122.10	57.32	19.28	33.64
果实干质量 Fruit dry mass /g	6.01	35.71	18.08	5.82	32.20
蓇葖纵径 Follicle longitudinal diameter /mm	9.81	22.88	14.54	2.65	18.20
蓇葖横径 Follicle transverse diameter /mm	6.41	21.08	9.15	1.64	17.88
蓇葖败育率 Follicle abortion rate /%	3.97	65.88	29.83	11.36	38.07
种子纵径 Seed longitudinal diameter /mm	4.12	7.12	5.69	0.56	9.82
种子横径 Seed transverse diameter /mm	3.65	8.31	5.90	0.83	14.11
种子千粒质量 1 000-seed mass /g	25.02	165.06	81.30	24.97	30.71
种子败育率 Seed abortion rate /%	1.12	43.95	14.25	10.78	75.65

位置 Position	蓇葖败育率 Follicle abortion rate /%		种子败育率 Seed abortion rate /%
位置 Position	平均值±标准差 Mean±Standard deviation	变异系数 Coefficient of variation	平均值±标准差 Mean±Standard deviation	变异系数 Coefficient of variation
果实上部 Upper part of fruit	25.19±13.01b	51.62	18.15±13.71a	75.52
果实中部 Middle part of fruit	23.45±11.34c	48.35	15.05±12.56a	83.45
果实下部 Lower part of fruit	38.22±12.66a	33.14	18.32±13.82a	75.40

性状 Trait	模型 Model	块金值 Nugget （C₀）	基台值 Sill （C₀+C）	空间结构比 Proportion （C₀/C₀+C）	变程 Range（A） /m	决定系数 Coefficient of determination	残差平方和 Residual sum of squares
果实长 Fruit length	线性模型 Linear model	979.045	979.045	1.000	105.26	0.03	2.74×10⁵
果实宽 Fruit width	指数模型 Exponential model	5.300	42.900	0.124	10.20	0.19	1.64×10²
果形指数 Fruit shape index	指数模型 Exponential model	0.185	1.456	0.127	11.10	0.24	0.23
果实鲜质量 Fruit fresh mass	指数模型 Exponential model	0.012	0.111	0.110	19.50	0.38	2.69×10^-3
果实干质量 Fruit dry mass	指数模型 Exponential model	0.009	0.100	0.090	12.00	0.22	1.71×10^-3
蓇葖纵径 Follicle longitudinal diameter	球状模型 Spherical model	0.003	0.006	0.499	39.20	0.67	3.20×10^-6
蓇葖横径 Follicle transverse diameter	线性模型 Linear model	0.002	0.005	0.491	105.26	0.59	5.91×10^-6
蓇葖败育率 Follicle abortion rate	高斯模型 Gaussian model	14.300	124.100	0.115	9.70	0.42	2.20×10³
种子纵径 Seed longitudinal diameter	线性模型 Linear model	0.274	0.339	0.809	105.26	0.25	0.02
种子横径 Seed transverse diameter	球状模型 Spherical model	0.047	0.714	0.066	12.90	0.39	0.12
种子千粒质量 1 000-seed mass	球状模型 Spherical model	0.001	1.954	0.001	13.20	0.65	0.42
种子败育率 Seed abortion rate	线性模型 Linear model	0.805	0.805	1.000	105.26	0.18	0.04

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