Neolamarckia cadamba<scp>(Roxb.) Bosser, 1984</scp>

Mojiol, Andy Russel; Lintangah, Walter; Maid, Mandy; Kodoh, Julius

doi:10.1002/9783527678518.ehg2017002

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…N. cadamba (2n = 44) is an evergreen deciduous and fast-growing tree species and belongs to the Neolamarckia genus of the Rubiaceae family [ 1 , 2 ]. This species is naturally distributed in Yunnan, Guangxi, and Guangdong provinces of South China and other subtropical and tropical regions, including Vietnam, Malaysia, Myanmar, India, Sri Lanka, and Australia [ 1 , 2 ]. N. cadamba can grow to 40–45 m in height and 100–160 cm in diameter [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…This species is naturally distributed in Yunnan, Guangxi, and Guangdong provinces of South China and other subtropical and tropical regions, including Vietnam, Malaysia, Myanmar, India, Sri Lanka, and Australia [ 1 , 2 ]. N. cadamba can grow to 40–45 m in height and 100–160 cm in diameter [ 2 ]. It prefers high temperature and strong light habitats as well as relatively moist and fertile soil [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…N. cadamba can grow to 40–45 m in height and 100–160 cm in diameter [ 2 ]. It prefers high temperature and strong light habitats as well as relatively moist and fertile soil [ 2 ]. It is characterized by a rounded crown, straight trunk, and rapid growth.…”

Section: Introductionmentioning

confidence: 99%

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Population Structure and Genetic Diversity in the Natural Distribution of Neolamarckia cadamba in China

Ouyang

et al. 2023

Genes

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Neolamarckia cadamba (Roxb.) Bosser is a fast-growing deciduous tree species and belongs to the Neolamarckia genus of the Rubiaceae family. This species has great economic and medical values in addition to being an important timber species for multiple industrial purposes. However, few studies have examined the genetic diversity and population structure in the natural distribution of this species in China. Here, we applied both the haploid nrDNA ITS (619 bp for aligned sequences) and mtDNA (2 polymorphic loci) markers to investigate 10 natural populations (239 individuals in total) that covered most of the distribution of the species in China. The results showed that the nucleotide diversity was π = 0.1185 ± 0.0242 for the nrDNA ITS markers and π = 0.00038 ± 0.00052 for the mtDNA markers. The haplotype diversity for the mtDNA markers was h = 0.1952 ± 0.2532. The population genetic differentiation was small (Fstn = 0.0294) for the nrDNA ITS markers but large (Fstm = 0.6765) for the mtDNA markers. There were no significant effects of isolation by distance (IBD), by elevation, and by two climatic factors (annual average precipitation and tem perature). A geographic structure among populations (Nst<Gst) was absent. Phylogenetic analysis showed a highly genetic mixture among individuals of the ten populations. Pollen flow was substantially greater than seed flow (mp/ms ≫ 1.0) and played a dominant role in shaping population genetic structure. The nrDNA ITS sequences were neutral and all local populations did not undergo demographic expansion. The overall results provide fundamental information for the genetic conservation and breeding of this miraculous tree.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population Structure and Genetic Diversity in the Natural Distribution of Neolamarckia cadamba in China

Ouyang

et al. 2023

Genes

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A complete sequence of mitochondrial genome of Neolamarckia cadamba and its use for systematic analysis

Wang

Chen

et al. 2021

Sci Rep

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Neolamarckia cadamba is an important tropical and subtropical tree for timber industry in southern China and is also a medicinal plant because of the secondary product cadambine. N. cadamba belongs to Rubiaceae family and its taxonomic relationships with other species are not fully evaluated based on genome sequences. Here, we report the complete sequences of mitochondrial genome of N. cadamba, which is 414,980 bp in length and successfully assembled in two genome circles (109,836 bp and 305,144 bp). The mtDNA harbors 83 genes in total, including 40 protein-coding genes (PCGs), 31 transfer RNA genes, 6 ribosomal RNA genes, and 6 other genes. The base composition of the whole genome is estimated as 27.26% for base A, 22.63% for C, 22.53% for G, and 27.56% for T, with the A + T content of 54.82% (54.45% in the small circle and 54.79% in the large circle). Repetitive sequences account for ~ 0.14% of the whole genome. A maximum likelihood (ML) tree based on DNA sequences of 24 PCGs supports that N. cadamba belongs to order Gentianales. A ML tree based on rps3 gene of 60 species in family Rubiaceae shows that N. cadamba is more related to Cephalanthus accidentalis and Hymenodictyon parvifolium and belongs to the Cinchonoideae subfamily. The result indicates that N. cadamba is genetically distant from the species and genera of Rubiaceae in systematic position. As the first sequence of mitochondrial genome of N. cadamba, it will provide a useful resource to investigate genetic variation and develop molecular markers for genetic breeding in the future.

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Multi-Level Genetic Variation and Selection Strategy of Neolamarckia cadamba in Successive Years

Que

et al. 2021

Forests

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Neolamarckia cadamba (Roxb.) Bosser is a tropical evergreen broadleaf tree species that could play an important role in meeting the increasing demand for wood products. However, multi-level genetic variation and selection efficiency for growth traits in N. cadamba is poorly characterized. We therefore investigated the efficiency of early selection in N. cadamba by monitoring the height (HT), diameter at breast height (DBH), and tree volume (V) in 39 half-sib families from 11 provenances at ages 2, 3, 4, 5, and 6 years in a progeny test. Age-related trends in growth rate, genetic parameters in multi-level, efficiency of early selection, and realized gain in multi-level for growth traits were analyzed. The result showed that genetic variation among families within provenances was higher than that among provenances. The estimated individual heritability values for the growth traits ranged from 0.05 to 0.26, indicating that the variation of growth traits in N. cadamba was subject to weak or intermediate genetic control. The age–age genetic correlations for growth traits were always positive and high (0.51–0.99), and the relationships between the genetic/phenotypic correlations and the logarithm of the age ratio (LAR) were described well by linear models (R2 > 0.85, except the fitting coefficient of genetic correlation and LAR for HT was 0.35). On the basis of an early selection efficiency analysis, we found that it is the best time to perform early selection for N. cadamba at age 5 before half-rotation, and the selection efficiencies were 157.28%, 151.56%, and 127.08% for V, DBH, and HT, respectively. Higher realized gain can be obtained by selecting superior trees from superior families. These results can be expected to provide theoretical guidance and materials for breeding programs in N. cadamba and can even be a reference for breeding strategies of other fast-growing tree species.

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Neolamarckia cadamba(Roxb.) Bosser, 1984

Cited by 4 publications

References 11 publications

Population Structure and Genetic Diversity in the Natural Distribution of Neolamarckia cadamba in China

Population Structure and Genetic Diversity in the Natural Distribution of Neolamarckia cadamba in China

A complete sequence of mitochondrial genome of Neolamarckia cadamba and its use for systematic analysis

Multi-Level Genetic Variation and Selection Strategy of Neolamarckia cadamba in Successive Years

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