Temporal and spatial characteristics of male cone development in<i>Metasequoia glyptostroboides</i>Hu et Cheng

Jin, Biao; Liang, Tao; Lu, Yan; Di, Wang; Zhang, Min; Ma, J.

doi:10.4161/psb.22898

Cited by 7 publications

(5 citation statements)

References 25 publications

(38 reference statements)

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“…The genetic differentiation among populations of F. hodginsii ( F st = 0.157 ± 0.019) is also in accordance with that of other mixed‐breeding species of seed plants (79.2%, Nybom & Bartish, ), slightly higher than that of wind‐dispersed species ( F st = 0.13), and much lower than that of entomophilous species ( F st = 0.21) (Nybom, ). This pattern is also in accordance with previous observations that the dispersal of Fokienia is mainly through the wind, though sometimes also through insects (Jin et al, ; Lu et al, ; Wang & Ran, ). Such patterns were also observed in Cupressus funebris , for which the genetic diversity within populations is 88.15%, F st = 0.1580 and F is = 0.1579 (Lu et al, 2014).…”

Section: Discussionsupporting

confidence: 93%

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Pronounced genetic differentiation in Fokienia hodginsii revealed by simple sequence repeat markers

Yin

Chen

Guo

et al. 2018

Ecology and Evolution

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Fokienia hodginsii is a Tertiary relict conifer of the monotypic genus Fokienia (Cupressaceae s.l.). Currently, the species is distributed in southern China, northern Vietnam, and northern Laos and listed as a “near threatened” species by the IUCN. In this study, a total of 427 individuals of F. hodginsii were sampled from China and Vietnam to characterize its genetic diversity and population differentiation. Based on the profiles of 12 simple sequence repeat (SSR) markers, we observed a high level of genetic diversity in F. hodginsii at the species level (H e =0.635), albeit slightly lower than that of its sister species Chamaecyparis obtusa. Signals of bottleneck events were detected in the populations GXDMS, GXHJ, V‐PXB, and V‐HB, probably due to Pleistocene glaciations or overexploitation in recent years. Pronounced genetic differentiation (F st = 0.157) was found in this species. The inbreeding index (F is = 0.176 ± 0.024) indicated that F. hodginsii has a mixed mating system. Significant correlation was found between the pairwise genetic differentiation and geographic distance (r = 0.882, p = 0.01), suggesting that genetic differentiation among the populations follows the model of isolation by distance (IBD). STRUCTURE analysis and principal coordinate analysis revealed that these populations were divided into four groups: the western China group located mainly in the Yunnan–Guizhou Plateau, the central China group located mostly in the Luoxiao Mountains and Nanling Mountains, the eastern China group located in the Wuyi Mountains and the Vietnam group containing two populations in Vietnam. The different terrains and elevations of populations may be the most likely factors leading to the differentiation between the western China group and the central China group, while the geographic isolation caused by the lack of appropriate habitats may greatly contribute to the differentiation between the central China group and the eastern China group. Based on the results, some conservation suggestions for this species are provided, such as establishing seed orchards and multiple nature reserves.

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Section: Discussionsupporting

confidence: 93%

“…Such a phenomenon was also observed in C. obtusa ( r 2 = 0.3997 and p = 0.001, Matsumoto et al, ). It is also known that the dispersal of Fokienia is mainly through the wind (Jin et al, ; Lu et al, ; Wang & Ran, ); thus, its capability for long‐distance dispersal could be limited as the geographic distance increases.…”

Section: Discussionmentioning

confidence: 99%

Pronounced genetic differentiation in Fokienia hodginsii revealed by simple sequence repeat markers

Yin

Chen

Guo

et al. 2018

Ecology and Evolution

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“…In the past few decades, there have been studies on morphology and anatomy (Sterling, 1949 ; Dörken, 2012 ); however, the majority of these have focused on female cones. Few reports have examined male cones (e.g., Jin et al, 2012 ) because few trees produce them. In addition, despite its large numbers and worldwide distribution, most adult trees have low seed viability as a result of inbreeding depression (Li et al, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Digital gene expression analysis of male and female bud transition in Metasequoia reveals high activity of MADS-box transcription factors and hormone-mediated sugar pathways

Zhao

Liang

et al. 2015

Front. Plant Sci.

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Metasequoia glyptostroboides is a famous redwood tree of ecological and economic importance, and requires more than 20 years of juvenile-to-adult transition before producing female and male cones. Previously, we induced reproductive buds using a hormone solution in juvenile Metasequoia trees as young as 5-to-7 years old. In the current study, hormone-treated shoots found in female and male buds were used to identify candidate genes involved in reproductive bud transition in Metasequoia. Samples from hormone-treated cone reproductive shoots and naturally occurring non-cone setting shoots were analyzed using 24 digital gene expression (DGE) tag profiles using Illumina, generating a total of 69,520 putative transcripts. Next, 32 differentially and specifically expressed transcripts were determined using quantitative real-time polymerase chain reaction, including the upregulation of MADS-box transcription factors involved in male bud transition and flowering time control proteins involved in female bud transition. These differentially expressed transcripts were associated with 243 KEGG pathways. Among the significantly changed pathways, sugar pathways were mediated by hormone signals during the vegetative-to-reproductive phase transition, including glycolysis/gluconeogenesis and sucrose and starch metabolism pathways. Key enzymes were identified in these pathways, including alcohol dehydrogenase (NAD) and glutathione dehydrogenase for the glycolysis/gluconeogenesis pathway, and glucanphosphorylase for sucrose and starch metabolism pathways. Our results increase our understanding of the reproductive bud transition in gymnosperms. In addition, these studies on hormone-mediated sugar pathways increase our understanding of the relationship between sugar and hormone signaling during female and male bud initiation in Metasequoia.

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“…3). Like M. glyptostroboides (Jin et al 2012), D. pectinatum male cones are mainly located around the outer and sunlit parts of crown. This is advantageous for pollen dispersal by wind, which is a common in conifers (Leslie 2011a, Leslie 2011b).…”

Section: Discussionmentioning

confidence: 99%

Temporal and Spatial Characteristics Endogenous Hormone Regulation During Male Cone Development of Dacrydium pectinatum

Song

et al. 2020

Preprint

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Abstract Background: Dacrydiumpectinatum de Laubenfels is a perennial gymnosperm dominant in tropical montane rain forests. Due to severe damages by excessive deforestation, typhoons, and other external forces, the population of the species has been significantly reduced. Furthermore, natural regeneration is poor. In order to better understand the reproductive process in D. pectinatum, we examined the morphological and anatomical changes during the development of male cone and analyzed the endogenous hormone dynamics.Results: Our study indicates that D. pectinatum male buds become distinguishable in April in tropical montane rain forests, while microspore sac forms in September and pollen mother cell forms and divides in December. Pollen grains mature and disperse in the following February. A mature male cone averages 8.5 mm in length. Level of GA, IAA, ABA and JA and their ratios fluctuated during late August to late November when sporogenous tissues were actively differentiated.Conclusions: The differentiation of sporogenous tissues is accompanied by variations in levels of endogenous hormones (GA, ABA, IAA, and JA) and their balances. The new insights about the cone development in D. pectinatum lay the foundation for future cone induction with hormones and study of factors contributing to the species’ low rate of seed germination.

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Temporal and spatial characteristics of male cone development inMetasequoia glyptostroboidesHu et Cheng

Cited by 7 publications

References 25 publications

Pronounced genetic differentiation in Fokienia hodginsii revealed by simple sequence repeat markers

Pronounced genetic differentiation in Fokienia hodginsii revealed by simple sequence repeat markers

Digital gene expression analysis of male and female bud transition in Metasequoia reveals high activity of MADS-box transcription factors and hormone-mediated sugar pathways

Temporal and Spatial Characteristics Endogenous Hormone Regulation During Male Cone Development of Dacrydium pectinatum

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