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1.
An evaluation of 30 naturally available candidate-plus trees (CPTs) of Pongamia pinnata was carried out to elucidate the genetic variability and relationship of pod and seed traits and progeny growth traits to select the best planting material with higher productivity. Significant variations were observed in pod and seed characteristics, oil content, and during the progeny trial studies. The highest values were found in 100-pod weight (410.4 gm) and 100-seed weight (195.92 gm) and the phenotypic and genotypic variance was found maximum in 100 pod weight (4364.71 and 4289.93) and 100 seed weight (813.8 and 768.93), respectively. Estimates of the phenotypic coefficient of variance were higher than the genotypic coefficient of variance for all the pod and seed traits and progeny growth traits, which depict the predominant role of the environment. Approximately 99 % of broad-sense heritability was revealed in oil content, followed by 100-pod weight (98.28 %), and canopy growth (96.93 %). Pod thickness shows the highest genetic advance of 56.61 %, followed by pod width (53.43 %) and canopy growth (49.3 %). Pod and seed traits have proven a positive correlation between each other and with progeny growth traits, except a few negative values. Hierarchical clustering by Ward’s minimum variance cluster analysis showed phylogeographical patterns of genetic diversity. K-means clustering revealed that trees from different geographical regions were grouped together in a cluster where as trees from the same geographical area are placed in a different cluster. Seven Pongamia ecotypes (GRP-8, 9, 13, 14, 18, 28, and 29) are found superior in traits, namely 100-pod weight, 100-seed weight, oil content, germination rate, plant height, canopy growth, and collar diameter. The traits 100-pod weight and 100-seed weight are highly correlated with the progeny growth traits and even have higher heritability and genetic advantages. 相似文献
2.
《林业研究》2016,(3)
An evaluation of 30 naturally available candidate-plus trees(CPTs) of Pongamia pinnata was carried out to elucidate the genetic variability and relationship of pod and seed traits and progeny growth traits to select the best planting material with higher productivity. Significant variations were observed in pod and seed characteristics,oil content, and during the progeny trial studies. The highest values were found in 100-pod weight(410.4 gm)and 100-seed weight(195.92 gm) and the phenotypic and genotypic variance was found maximum in 100 pod weight(4364.71 and 4289.93) and 100 seed weight(813.8 and768.93), respectively. Estimates of the phenotypic coefficient of variance were higher than the genotypic coefficient of variance for all the pod and seed traits and progeny growth traits, which depict the predominant role of the environment. Approximately 99 % of broad-sense heritability was revealed in oil content, followed by 100-pod weight(98.28 %), and canopy growth(96.93 %). Pod thickness shows the highest genetic advance of 56.61 %,followed by pod width(53.43 %) and canopy growth(49.3 %). Pod and seed traits have proven a positive correlation between each other and with progeny growth traits,except a few negative values. Hierarchical clustering by Ward's minimum variance cluster analysis showed phylogeographical patterns of genetic diversity. K-means clustering revealed that trees from different geographical regions were grouped together in a cluster where as trees from the same geographical area are placed in a different cluster. Seven Pongamia ecotypes(GRP-8, 9, 13, 14, 18,28, and 29) are found superior in traits, namely 100-pod weight, 100-seed weight, oil content, germination rate,plant height, canopy growth, and collar diameter. The traits100-pod weight and 100-seed weight are highly correlated with the progeny growth traits and even have higher heritability and genetic advantages. 相似文献
3.
In this study, we assessed the variability in pod, seed traits and oil content of 24 accessions of Pongamia pinnata collected from different parts of the Andaman and Nicobar Islands, India. The experiment was conducted at the Central Agricultural Research Institute, Port Blair during 2010 to 2011. The variability studies for pod and seed traits revealed that, the accession CPT-6 collected from New Wandoor in South Andaman recorded the maximum values for eight traits viz. pod length （75.51 mm）, pod width （34.62 mm）, pod thickness （17.55 mm）, 100 pod weight （770.33 g）, seed width （21.23 mm）, 100 seed weight （377.00 g）, oil percentage （43.92%） and germination percentage （94.7%）. However, the maximum seed length （26.46 mm） was recorded from CPT 2 and the maximum pod-seed ratio was obtained from CPT 13 and CPT 4 （2.50 and 2.44 respectively）. The phenotypic and genotypic coefficients of variations were also close to each other for all traits, but the 100 pod and seed weight exhibited higher phenotypic and genotypic coefficient of variation than the other traits. Estimates of broad sense heritability ranged from 0.30 （for seed length） to 0.95 （pod length） and genetic ad- vance as percent of the mean ranged between 11.66% and 57.40% with seed length giving the lowest value and 100 pod weight giving the high- est value. Both the phenotypic and genotypic correlation between pod length, pod width, pod thickness, 100 pod weight, seed width and 100 seed weight and between pod thickness, 100 pod weight, seed width, 100 seed weight and germination percentage were found to be strong. On the basis of non hierarchical Euclidian cluster analysis, 24 accessions were grouped into six clusters. The maximum numbers of seven accessions were included in cluster VI. The maximum intra cluster distance （10.238）shown by cluster VI and the maximum inter cluster distance （17.021） between V and HI followed by III and II （15.942）. Among the six clus- ters formed the cluster III recorded maximum oil percentage, 100 pod weight, 100 seed ,weight, pod length, pod thickness, pod width, seed width and. germination percentage, while cluster V recorded maximum pod seed ratio and germination percentage. The present findings suggest that the crossing between accessions of cluster V and cluster III will result in a wide spectrum of variability in subsequent generations. 相似文献
4.
Chemulanga Josiah Chiveu Otto George Dangasuk Michael Eliazar Omunyin Francis Nyamu Wachira 《New Forests》2009,38(1):1-14
Acacia senegal (L.) Willd. is an African leguminous multipurpose tree species belonging to subfamily Mimosoideae and subgenus Aculeiferum, highly valued for gum arabic production. This study estimated the genetic diversity within and among Kenyan populations
of the species in the Bulla Sambul, Kutulo, Wamba and Meisori populations based on 12 quantitative traits, which included;
tree height, diameter at breast height (DBH), number of branches, bark thickness, gum weight and various pod and seed traits
on 20 randomly selected trees in every population. Duncan’s multiple range test (DMRT) and the dendrogram distinctively divided
the populations into two groups; Wamba and Meisori in one group while Bulla Sambul and Kutulo in the other, indicating geographical
structuring of the genetic variability. The trees were larger, taller with greater pod and seed traits in the Wamba and Meisori
than the Bulla Sambul and Kutulo populations. Contrarily, trees had lighter seeds, more branches with higher gum weight in
the Kutulo and Bulla Sambul than the Wamba and Meisori populations. The Shannon–Weaver diversity index (H), depicted 1,000-seed weight as the most varied trait across the populations. These findings provide essential information
on the genetic diversity of the species, necessary for delineation of particular zones for seed sources for germplasm conservation,
selection for domestication and improved gum arabic production. 相似文献
5.
Variability in seed traits and genetic divergence in a clonal seed orchard of Dalbergia sissoo Roxb.
The variations in seed and pod traits, genetic superiority and genetic divergence were evaluated for a Clonal Seed Orchard (CSO) of Dalbergia sissoo Roxb. at Bithmera, India consisting of 20 clones from different agro-climatic conditions of four northern states (Uttar Pradesh, Uttarakhand, Haryana and Rajasthan). The seeds and pods of various clones in the orchard exhibited significant variability in size, weight and other characters. Significant positive correlations were observed between seed length and seed width (p<0.05), seed length and seed thickness (p<0.01), seed length and seed weight (p<0.01), seed thickness and seed weight (p<0.01), seed length and germination value (p<0.05). The genetic parameters for seed and pod traits also showed a wide range of variations in the orchard. Heritability values were found to be over 50 percent for most of the seed and pod traits. Seed weight, seed length and seed thickness showed high heritability values coupled with maximum genetic gain for these characters. Ward’s minimum variance dendrogram of clones of D. sissoo showed three distinct clusters; cluster 1 was the largest with 12 better clones whereas cluster 2 and 3 consisting of seven moderate clones and one poor clone, respectively. Mean cluster values showed sufficient variation among the clusters for seed weight, germination value and seed length. The possible hybridization between best clones of cluster 1 to the disease resistant clone of cluster 2 (resistant against deadly Gandoderma lucidum root rot disease of D. sissoo) is also suggested for further breeding programmes of the species. The deployment of clone 194 (better performed and disease resistant) is also recommended in future plantation programmes of D. sissoo in northern India. 相似文献
6.
7.
濒危植物格木天然种群的表型多样性及变异 总被引：5，自引：0，他引：5
【目的】通过对濒危植物格木在我国中心分布区种群的果荚和种子表型性状测量分析,研究其表型多样性及变异规律,结合地理气候信息探讨影响表型变异的关键因子,为格木天然种群的遗传多样性保护恢复和引种栽培提供科学依据。【方法】对8个格木天然种群114个单株的13个果荚及种子表型性状进行测量,利用巢式方差分析、多重比较、相关性分析、主成分分析、聚类分析等分析方法,探讨格木天然种群的表型多样性水平、进化和适应性潜力、表型变异规律、表型分化水平、种群聚类特征及其与地理气候因子的相关性。【结果】格木表型多样性水平中等,13个性状的Shannon-Wiener指数在1. 911 1(种形指数)～2. 103 9(果荚周长)之间,平均2. 027 8;8个种群的Shannon-Wiener指数在0. 920 9(P6)～1. 885 6(P8)之间,均值为1. 474 7。格木表型性状离散程度较轻,13个性状的变异系数在7. 544 6%(种子长)～18. 868 5%(果荚面积)之间,均值为12. 410 9%; 8个种群的变异系数在8. 852 9%(P1)～13. 984 8%(P5)之间,均值为12. 410 9%。13个表型性状的极大值为极小值的1. 395 2(种形指数)～2. 805 6(每荚种子数)倍,均值为1. 791 7。巢式方差分析表明,格木13个表型性状在种群间和种群内均存在极显著差异(P<0. 01),说明这些性状在种群间和种群内均存在丰富的变异;种群内的变异(40. 387 1%)远大于种群间(11. 948 9%)。种群平均表型分化系数为21. 857 9%,各性状的分化系数变化幅度在7. 476 5%(种形指数)～38. 674 0%(果荚宽)之间。相关性分析表明,13个表型性状之间大多存在显著或极显著相关,果荚宽度、种子周长等性状和温度指标呈负相关,与纬度呈正相关,格木在气温高、降雨量大的地区往往具有小果荚、小种子的特征,随着温度指标降低和纬度增加,格木果荚及种子有变大的趋势。格木13个表型性状可提炼为4个主成分,累积贡献率为87. 382%。8个天然群体基于欧氏距离可分为3类:第1类2个种群呈现果荚小、种子小的特征,该类表型主要出现在格木分布区的南端;第2类5个种群呈现果荚大、种子大的特征,该类表型主要出现在格木分布区的北部,仅1个种群位于分布区的南部;第3类1个种群呈现果荚小、种子少、种子大而薄的特征,该类表型出现在格木南北分布区的中间衔接部。【结论】格木的表型多样性处于中等水平,在个体上存在较为丰富的变异。在群体及物种水平上,格木表型性状离散程度较轻,各个性状分布相对集中,较为稳定,不易发生群体分化,拥有特殊表型的格木单株具有较高的保存价值。果荚及种子大小进化及适应性潜力相对较大,种形指数最不易产生变异。种群内的变异是格木表型变异的主要来源,格木的种质资源收集保存可减少种群数量,增加种群内个体数量,并优先收集有特殊表型的单株。广西省容县和龙圩区的格木种群是格木遗传多样性保护及种质资源收集保存的重点区域。年均温等温度因子是影响格木表型及分布的最主要因子。果荚及其中种子的大小是格木种群间聚类的主要依据。 相似文献
8.
A field trial of 20 seed sources of Asparagus racemosus was conducted at the Forest Research Institute, Dehradun, Uttarakhand, India to evaluate their performance of different economic
traits. Genotypic variance, phenotypic variance, genotypic coefficient of variance (GCV) and phenotypic coefficient of variance
(PCV) for number of shoots, shoot height, shoot weight, number of roots, root length, root diameter and root weight were calculated.
Maximum genotypic and phenotypic variance was observed in shoot height among the shoot — related traits and root length among
the root — related traits. For the shoot height, genotypic variance, phenotypic variance, genotypic coefficient of variance,
phenotypic coefficient of variance were 231.80, 3924.80, 61.26 and 1037.32, respectively, where those of the root length were
9.55, 16.80, 23.46 and 41.27, respectively. The maximum genetic advance and genetic gain were obtained for shoot height among
the shoot-related traits and root length among the root-related traits. Index values were developed for all the seed sources
based on the four most important traits, and Panthnagar (Uttrakhand), Jodhpur (Rajasthan), Dehradun (Uttarakhand), Chandigarh
(Punjab), Jammu (Jammu and Kashmir) and Solan (Himachal Pradesh), were promising seed sources for root production. 相似文献
9.
无患子属种质资源种实性状变异及综合评价 总被引：2，自引：0，他引：2
【目的】对我国及越南无患子属3种1变种的天然种质资源进行综合评价并定向筛选最优种质,为无患子属良种选育提供理论支撑和选育材料。【方法】基于我国14省(市、自治区)及越南1地区的无患子、川滇无患子、毛瓣无患子及石屏无患子共200份无患子属种质资源,针对20个种实性状,利用相关性、聚类和主成分分析等统计方法,分析种实性状变异,量化评价各种质。【结果】 1)无患子属种实性状变异系数(CV)在5.46%~38.19%,平均变异系数为17.42%,以果皮皂苷质量分数(CV=38.19%)、种仁百粒质量(30.23%)和果皮百粒质量(30.29%)变异较大,果型指数(5.46%)和种型指数(5.70%)变异较小。种实性状多样性指数在1.47~2.04之间,平均多样性指数为1.95。2)果实百粒质量与果皮百粒质量( r^2=0.927)、种子百粒质量(0.768)呈极显著正相关;种子百粒质量与种壳百粒质量(0.863)、种仁百粒质量(0.635)呈极显著正相关,而油脂质量分数与果皮皂苷质量分数(-0.382)呈极显著负相关。3)聚类分析将种质划分为3大类群,类群Ⅰ为小果型,类群Ⅲ为中果型,类群Ⅱ为大果型。无患子主要属于类群Ⅰ,川滇无患子、毛瓣无患子、石屏无患子主要属于类群Ⅱ、Ⅲ。类群Ⅱ集中分布于贵州、云南区域。4)针对无患子产业油用、皂用及综合利用开展主成分分析,筛选出3类无患子属优良种质各10份,主要为无患子、毛瓣无患子种质,综合利用优良种质较平均水平增益36.85%。【结论】无患子属果皮皂苷质量分数、种仁百粒质量和果皮百粒质量为代表的产量指标变异幅度最大,为无患子良种选育提供了丰富的资源和极大的空间;无患子属对皂苷产物积累过程投入的增加要以减少对油脂积累的投入为代价,这体现了无患子属在特定生态环境中的权衡策略;筛选出油用、皂用及综合利用3类各10份无患子属最优种质,普遍分布于云南、贵州区域,推测这些区域拥有更适合发展无患子产业的优良种质和环境条件。 相似文献
10.
[Objective]To compare the differences of seed morphological characters among provinces of Quercus variabilis Bl.,and explore the adaptive growth status of seedlings growing in the central distribution area. [Method]The seeds of 6 Q. variabilis provenances from six provinceswerecollected, and the seedlings were cultivated and transplanted to experimental field in the centre of natural distribution range (Wuhan Jiufeng National Forest Park), then the seed morphology and one-year seedling growth traitswere surveyed. [Result](1)There were significantor extremely significantdifferences among provenances in seed length, seed width, seed length/width ratio and 100-seed mass, the order of seed length among provenances was Beijing Provenance (22.28 mm),Hubei Provenance (22.10 mm), He'nan Provenance (20.80 mm), Shaanxi Provenance (19.57 mm), Yunnan Provenance (18.93 mm)and Liaoning Provenance (18.81 mm), the seed width of Beijing Provenance (19.71 mm) and Hubei Provenance (19.16 mm) was higher than that of the others, the seed length/width ratio of He'nan Provenance (1.38) was extremely significantly higher than that of the others; (2)There were significant or extremely significant differences among provenances in seedling height, ground diameter, leaf number, branching number and seedling height/ground diameter, the Beijing Provenance and Hubei Provenance were better in seedling height and leaf number, which were respectively 19.54 cm and 20.26 cm, 8.32 leaves and 9.50 leaves; (3)A decreasing trend with time for seedling growth traits among provenances was found; (4)There was a positive relationship between seed morphological characters and seedling growth traits except seed length/width ratio; the leaf number was significantly related to ground diameter and branching number and the seedling height and leaf number were closely related to the seed morphological characters; (5)It showed a decreasing trend with the growth time in the relationship between seedling growth traits and 100-seed mass. [Conclusion]The seedlings of Beijing Provenance and Hubei Provenance grew better in the experimental field which might be related to their larger seed mass, and the Yunnan Provenance in the south margin and the Liaoning Provenance in the north margin of distribution area of Q. variabilis grew weaker than the provenances in the centre of distribution area.With the effect of climate change, provenances in the margin of distribution area may lose in the community competition in the seedling stage if it cannot take advantage of its dispersal and settlement and affected by the disadvantage of growth and competition, so that the distribution and population renewal would surely be affected. 相似文献
11.
S. De Smedt K. Alaerts A. M. Kouyaté P. Van Damme G. Potters R. Samson 《Agroforestry Systems》2011,82(1):87-97
We analyzed the phenotypic variation of baobab (Adansonia digitata L.) fruits from Mali to define the domestication potential of this species. 269 trees, selected from 10 provenances distributed
along a rainfall gradient, were characterized. Five fruits were sampled from each tree. Total individual fruit weight was
partitioned into shell, pulp, and seed weight. Ratios were calculated between pulp + seed and total weight, and between pulp
and seed weight. For all the measured fruit traits, we detected significant differences between provenances, as well as between
trees from the same provenance. Assuming that the measured traits are under genetic control, the latter facts indicate that
there are considerable opportunities for tree selection on a local scale. However, candidate plus trees with specific properties,
e.g., extremely high pulp or seed weight, were found only in some locations. Mean pulp yield per fruit might be considerably
increased by selecting the 5% trees with the highest pulp weight (mean: 45 ± 1 g, best 5%: >100 g). The same might be true
for seed production (mean: 71 ± 2 g, best 5%: >150 g). Also the ratio between pulp and seed weight can be an important fruit
characteristic for selection: in fruits with a low ratio, relatively more pulp sticks to the seeds when separating the two
fruit parts by grinding, and thus more pulp will be lost for further processing. We identified several trees with a high pulp
weight combined with a high ratio between pulp and seed weight. It is concluded that there is considerable phenotypic variability
in traits of baobab fruit in Mali, offering opportunities for cultivar selection. 相似文献
12.
Seed morphometric characters and oil content were studied in multiple-use plant, Calophyllum inophyllum L. of two countries, Australia (southern hemisphere) and Sri Lanka (northern hemisphere). Seven provenances were selected
which included three from northern Australia and four from Sri Lanka. Twelve Candidate plus trees (CPTs) each were selected
from 2 to 3 different locations within each provenance based on the morphometric and qualitative traits (GBH > 100 cm). Seed
collection in both hemispheres was carried out from May to August 2008. Calophyllum inophyllum L. provenances showed a distinct hemisphere variation in their seed-related characters and oil content. All provenances differed
significantly (P < 0.05) with one another in seed length. Seeds from Anuradhapura, Sri Lanka and seeds from Cardwell Australia recorded the
highest (≈57%) and the lowest oil (≈31%) content respectively. Strong correlations were found between seed morphometric characters.
Relatively weaker correlations were found between seed morphometric characters and oil content. Variations in seed-related
characters were largely attributed by the provenance contribution which shows the significance of the effect of genetic variability
on above mentioned seed related characters. 相似文献
13.
14.
黄连木天然群体表型变异与多样性研究 总被引：1，自引：0，他引：1
以11个黄连木天然群体为试材,对18个表型性状的变异与多样性进行分析,结果表明:黄连木表型性状存在极其丰富的群体间和群体内变异,各性状间的变异系数相差较大,变幅为4.249%~27.31%,果实性状的变异系数最小,受较高的遗传控制。群体间平均表型分化系数VST为22.27%,说明群体内变异是黄连木遗传变异的主要来源,采用聚类分析的方法,把11个群体分为4类,表型性状与地理气候因子相关分析表明除百果重、千粒重、种长几个性状外,多数表型性状随地理位置的改变没有明显的变化,但有随着经度、纬度的增加而逐渐增大趋势。 相似文献
15.
16.
对梅州地区梅江区(MJ)、梅县区(MX)和平远县(PY)、大埔县(DB)、丰顺县(FS)、五华县(WH)等6个不同区域的油茶花、叶及果3种器官的17个表型性状进行差异性分析。结果表明:梅州地区油茶的表型性状多样性均较丰富,其中花的表型多样性最为丰富。6个不同区域之间油茶的花、叶、果的17个表型性状的差异均达到极显著。表型性状最优的2个居群是FS和PY,其中FS的花冠直径最大,达59.16mm;柱头裂数最多,约8个;油茶鲜籽质量最大,达8.71 g;鲜果出籽率最高,达40.85%。PY的萼片数最多,约4片;花瓣数最多,约4片;叶宽最大,达27.79 mm;侧脉对数最多,约8对;单果质量最大,达22.22 g;平均果径最大,达33.76 mm;籽数最多,约5粒。聚类分析将梅州地区油茶表型性状分为大叶、小花、大果及出籽率低与小叶、大花、小果及出籽率高2种类型。 相似文献
17.
Pian Rui-qi Zhao Yang Li Wei Chen Xiao-yang 《中国林学(英文版)》2007,9(4):272-278
Lespedeza bicolor Turcz is a native shrub in the temperate region of China. Thirteen provenances of L. bicolor were inves-tigated in our study. Morphological diversity among and within provenances were analyzed based on 19 phenotypic traits, including seven vegetative growth characteristics, nine floral traits and three pod characteristics. The coefficient of variation (CV) ranged from 6.4% to 65.4% and the phenotypic differentiation coefficient from 43.3% to 97.3%. Analyses of variance showed that there were extremely significant variations among and within provenances in pod length. Differences in plant height, inter-nodal length, number of branches, leaf width, leaf length and leaf area were not remarkable among provenance, but distinct within provenances. Other traits showed evidence of contrasts. Variation among provenances was the main part of phenotypic variation. Correlation analysis indicated that there were highly significant positive correlations between plant height and other vegetative growth characteristics. Floral traits were not associated with vegetative growth characteristics. The 13 provenances of L. bicolor investigated can be classi-fied into three groups according to a UPGMA cluster analysis. 相似文献
18.
对短萼仪花群落中5个优良单株的荚果长、荚果宽、荚果长宽比、种子长、种子宽、种子长宽比及种子单粒质量等性状进行测定分析,发现单株间种子表型性状差异均达到极显著水平;变异最大的为种子单粒质量,其变异系数为20.41%;种子表型性状间具有一定的相关性。 相似文献
19.
Burcu Çengel Yasemin Tayanç Gaye Kandemir Ercan Velioglu Murat Alan Zeki Kaya 《New Forests》2012,43(3):303-317
To test how efficiently plantations and seed orchards captured genetic diversity from natural Anatolian black pine (Pinus nigra Arnold subspecies pallasiana Holmboe) seed stands, seed sources were chosen from 3 different categories (seed stands (SS), seed orchards (SO) and plantations
(P)) comprising 4 different breeding zones of the species in Turkey. Twenty-five trees (mother trees) were selected from each
SS, SO and P seed sources and were screened with 11 Random Amplified Polymorphic DNA (RAPD) markers. Estimated genetic diversity
parameters were found to be generally high in all Anatolian black pine seed sources and the majority of genetic diversity
is contained within seed sources (94%). No significant difference in genetic diversity parameters (numbers of effective alleles,
% of polymorphic loci and heterozygosity) among seed source categories was found, except for a slight increase in observed
heterozygosities in seed orchards. For all seed source categories, observed heterozygosity values were higher (Ho = 0.49 for SS, 0.55 for SO and 0.49 for P) than expected ones (He = 0.40 for SS, 0.39 for SO and 0.38 for P) indicating the excess of heterozygotes. In general, genetic diversity in seed
stands has been transferred successfully into seed orchards and plantations. However, the use of seeds from seed orchards
can increase the amount of genetic diversity in plantations further. The study also demonstrated that number of plus-tree
clones (25–38) used in the establishment of seed orchards was adequate to capture the high level of diversity from natural
stands. 相似文献
20.
利用设置在福建南平国有来舟林业试验场马尾松高产脂半同胞家系测定林,研究其产脂力与生长、树冠性状在家系间的遗传变异以及它们之间的遗传相关性,并进行脂用马尾松优良家系及优良单株选择。结果表明,马尾松产脂力与生长、树冠性状皆存在显著的家系差异,相对于生长、树冠性状,产脂力变异较大,变异系数高达61.91%,具有丰富的选择基础。产脂力受中度遗传控制,家系遗传力和单株遗传力分别为0.42和0.31,表明对马尾松产脂力通过家系和单株选择可取得较好的改良效果。性状遗传相关分析结果显示,马尾松家系产脂力与胸径、树高和材积呈较高的正遗传相关,表明在遗传育种进程中可同时对生长性状和产脂力进行改良。此外,产脂力与冠幅、冠高、轮盘数、活枝数也呈较高的正遗传相关。综合生长、树冠性状的遗传力以及与产脂力相关程度,认为胸径是高产脂优树间接选择的最佳指标。以单株产脂量和单株材积生长作为综合选择指标,共选出20个优良家系和16株优良单株,选出的优良单株产脂力遗传增益在52.54% 154.40%,单株材积遗传增益在0.22% 31.85%。 相似文献