Reduced fertility in triploids of Acacia auriculiformis and its hybrid with A. mangium

Nghiem, Chi Quynh; Griffin, R; Harbard, J. L.; Harwood, CE; Le, Son; Nguyen, Kien Duc; Bon, Pham Van

doi:10.1007/s10681-018-2157-8

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…One barrier to use an autotetraploid as a paternal parent for crossing is that the pollens of an autotetraploid have lower activity. Previous studies have demonstrated that the mitosis of autotetraploid pollens is abnormal and often results in reduced pollen activity and lower fertility rates, which can eventually affect fruit settings, seed numbers, and the seed germination rates of the hybrid fruits [19,[47][48][49]. Although autotetraploid pollen activity and fertility were reduced, it did not significantly affect the acquisition of triploid seeds via crossing.…”

Section: Discussionmentioning

confidence: 99%

Autotetraploidization Alters Morphology, Photosynthesis, Cytological Characteristics and Fruit Quality in Sour Jujube (Ziziphus acidojujuba Cheng et Liu)

Li-hu

Wang

et al. 2023

Plants

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Artificially induced polyploidization is one of the most effective techniques for improving the biological properties and creating new cultivars of fruit trees. Up to now, systematic research on the autotetraploid of sour jujube (Ziziphus acidojujuba Cheng et Liu) has not been reported. ‘Zhuguang’ is the first released autotetraploid sour jujube induced with colchicine. The objective of this study was to compare the differences in the morphological, cytological characteristics, and fruit quality between diploid and autotetraploid. Compared with the original diploid, ‘Zhuguang’ showed dwarf phenotypes and decreased tree vigor. The sizes of the flowers, pollen, stomata, and leaves of ‘Zhuguang’ were larger. Perceptible darker green leaves were observed in ‘Zhuguang’ trees owing to increased chlorophyll contents, which led to higher photosynthesis efficiency and bigger fruit. The pollen activities and the contents of ascorbic acid, titratable acid, and soluble sugar in the autotetraploid were lower than those in diploids. However, the cyclic adenosine monophosphate content in autotetraploid fruit was significantly higher. The sugar/acid ratio of autotetraploid fruit was higher than that of diploid fruit, which made the autotetraploid fruit taste different and better. The results indicated that the autotetraploid we generated in sour jujube could greatly meet the goals of our multi-objective optimized breeding strategies for improving sour jujube, which includes tree dwarfing, increased photosynthesis efficiency, and better nutrient values and flavors as well as more bioactive compounds. Needless to say, the autotetraploid can also serve as material for generating valuable triploids or other types of polyploids and are also instrumental in studying the evolution of both sour jujube and Chinese jujube (Ziziphus jujuba Mill.).

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Section: Discussionmentioning

confidence: 99%

Autotetraploidization Alters Morphology, Photosynthesis, Cytological Characteristics and Fruit Quality in Sour Jujube (Ziziphus acidojujuba Cheng et Liu)

Li-hu

Wang

et al. 2023

Plants

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“…In Vietnam, approximately 0.5 M ha of A. hybrid had been established by 2014, a similar area to that of A. mangium at that time [3]. Breeding and clonal development programs for diploid Acacia mangium, A. auriculiformis, and A. hybrid were established in Vietnam in the 1990s and research into the potential for developing polyploid varieties commenced in 2003 [4], with the long-term aim of producing triploid (3x) genotypes that would be highly productive, effectively sterile [5] (and therefore non-weedy), and with the potential for expression of novel traits [6] such as increased fiber dimensions and modified pulp properties [7]. The initial focus was on the production of autotetraploid (4x) A. mangium for mating with diploid (2x) selections [4], but given the commercial success of the diploid hybrid we also decided to explore the potential for producing and breeding from 4x cytotypes of selected F 1 A. hybrid clones [8].…”

Section: Introductionmentioning

confidence: 99%

Breeding Polyploid Varieties of Acacia: Reproductive and Early Growth Characteristics of the Allotetraploid Hybrid (Acacia mangium × A. auriculiformis) in Comparison with Diploid Progenitors

Griffin

Harwood

et al. 2021

Forests

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Diploid clones of the hybrid acacia (Acacia mangium × A. auriculiformis) are widely planted in Vietnam because of their high productivity, adaptability, and commercial wood yields. Polyploid breeding offers possibilities for further enhancing hybrid vigor and generating new high value genotypes. In a field trial, we compared three diploid hybrid clones with their respective colchicine-induced tetraploid lines. Flowering and seed production of each cytotype were observed and open pollinated seed collected for determination of outcrossing rate and ploidy, inbreeding depression and marker inheritance in the progeny. Comparisons are also made with published characteristics of autotetraploids derived from A. mangium. Compared with their corresponding diploid cytotypes, the allotetraploids flowered slightly later but more intensely; produced the same number of seeds per pod but larger seeds; and showed a greatly reduced level of outcrossing (an average of 14% compared with 87%). Inbreeding depression for height growth was less for progeny from the allotetraploid lines (17%) than for those from the original diploids (33%). 96% of seeds from the allotetraploid clones were also tetraploid, but we observed triploids at low frequency at both the seed and field progeny stages. The segregation of the molecular markers in outcrossed allotetraploid progenies demonstrated both disomic and tetrasomic inheritance, indicating that the hybrid behaves as a segmental allotetraploid. Results suggest that an open pollinated breeding strategy is a practical option for improving polyploid acacia hybrids.

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“…in China suggest that triploid breeding will play an important role in increasing yield of forest production, improving wood quality and stress resistance. Chi et al (2018) in triploids of Acacia auriculiformis and its hybrid with A. mangium report the advantage of using triploid clones, because in addition to characteristics of interest of plants, these triploids are infertile, which is desirable when natural regeneration is not aimed at. Griffin et al (2015) in study with Acacia species in Vietnam report that development of polyploids is a means of introducing diversity in populations, in addition to improvements in wood fibers and other properties.…”

Section: Introductionmentioning

confidence: 99%

Differences in wood properties among Eucalyptus grandis and Eucalyptus grandis x Eucalyptus urophylla with different degrees of ploidy

Longui

Custódio

Amorim

et al. 2021

RSD

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We compared the anatomy, density, chemical contents, and bioenergy values of Eucalyptus grandis and hybrids of Eucalyptus grandis x Eucalyptus urophylla wood originating from diploids, triploids and tetraploids. We hypothesize that Eucalyptus grandis and hybrids of Eucalyptus grandis x Eucalyptus urophylla with different degrees of ploidy have variations as a result of different sets of chromosomes producing different phenotypic expressions and chemical constituents, such as variation in cell size and frequency, which would directly influence wood quality. Twenty-year-old trees were cut, eight for each ploidy: diploids and tetraploids are E. grandis; triploids are E. grandis x E. urophylla. We use standardized techniques. Our hypothesis was confirmed. Triploid and tetraploid trees presented wider trunks, taller trees with longer stems and wider crowns compared to diploid trees. Wood density showed significant radial variation only in diploids, while triploid and tetraploid trees were more homogeneous. In polyploid trees, the anatomical features did not clearly present a radial pattern. Triploid and tetraploid trees presented higher density wood than diploid trees. The chemical constituents varied from pith to bark in the three ploidies, but no differences between ploidies were found. For energy generation purposes, diploid and triploid trees are more desirable than tetraploid trees.

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Reduced fertility in triploids of Acacia auriculiformis and its hybrid with A. mangium

Cited by 8 publications

References 38 publications

Autotetraploidization Alters Morphology, Photosynthesis, Cytological Characteristics and Fruit Quality in Sour Jujube (Ziziphus acidojujuba Cheng et Liu)

Autotetraploidization Alters Morphology, Photosynthesis, Cytological Characteristics and Fruit Quality in Sour Jujube (Ziziphus acidojujuba Cheng et Liu)

Breeding Polyploid Varieties of Acacia: Reproductive and Early Growth Characteristics of the Allotetraploid Hybrid (Acacia mangium × A. auriculiformis) in Comparison with Diploid Progenitors

Differences in wood properties among Eucalyptus grandis and Eucalyptus grandis x Eucalyptus urophylla with different degrees of ploidy

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