A female fertile triploid loquat line produces fruits with less seed and aneuploid germplasm

Wang, Peng; Yang, Yao; Lei, Cheng-Gong; Xia, Qingqing; Wu, Di; He, Qiang; Jing, Danlong; Guo, Qigao; Liang, Guolu; Dang, Jiangbo

doi:10.1016/j.scienta.2023.112141

Cited by 2 publications

(4 citation statements)

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“…In the case of Dactylis polyploids, it was observed that natural polyploids demonstrated proficient chromosome pairing during meiosis, whereas their artificial counterparts did not [37]. This observation implies a selective pressure for sexual fertility, potentially serving to stabilize the meiotic process in natural polyploids [30].…”

Section: Discussionmentioning

confidence: 99%

“…Theoretically, triploids are rendered sterile due to the unbalanced segregation of chromosomes during meiosis, consequently leading to aneuploid gamete production [29,30]. However, in practical scenarios, it is noteworthy that in some species, a significant number of triploids demonstrate the capacity to generate functional euploid gametes, particularly in varying proportions of x and 2x gametes [30,31]. These gametes can serve as valuable contributors, either as female or male parents, in cross-breeding initiatives [32].…”

Section: Discussionmentioning

confidence: 99%

“…For example, in a study on Ranunculus kuepferi, Schinkel et al [33] successfully obtained a total of 125 fully developed seeds from 25 triploid plants. In the context of meiosis in sexual polyploids, the allocation of two chromosome sets from the 2n gamete to a daughter cell tends to give rise to a 2x gamete [30,31]. The occurrence of this chromosome behavior during meiosis is primarily contingent upon the genetic compatibility between the parental contributors of the chromosome sets [32].…”

Section: Discussionmentioning

confidence: 99%

“…The occurrence of this chromosome behavior during meiosis is primarily contingent upon the genetic compatibility between the parental contributors of the chromosome sets [32]. In instances where the genetic relatedness is highly close, as observed in sexual autopolyploids, the main configuration of chromosome pairing at diakinesis consists of either trivalents (in the case of sexual autotriploids) or quadrivalents (in the case of sexual autotetraploids) [30,34]. Conversely, when the genetic relationship is further apart, as seen in sexual allopolyploids, the primary configuration of chromosome pairing comprises a univalent and a bivalent (in sexual allotriploids) or two bivalents (in sexual allotetraploids) [31,34].…”

Section: Discussionmentioning

confidence: 99%

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Naturally Occurring Triploidy in Cannabis

Philbrook,

Jafari,

Gerstenberg

et al. 2023

Plants

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Polyploidy is a significant evolutionary process in plants that involves the duplication of genomic content and has been recognized as a key mechanism driving plant diversification and adaptation. In natural populations, polyploids frequently arise from unreduced gametes, which subsequently fuse with reduced or unreduced gametes, resulting in triploid or tetraploid offspring, respectively. Cannabis sativa L. is a diploid species, but recent work using artificially induced polyploidy has demonstrated its potential advantages in an agricultural setting. Further, recent work has identified that some elite clonal cultivars, vis. Mac1, are triploid, with no indication that they were artificially produced. The current study was conducted to determine if polyploidy is a naturally occurring phenomenon in cannabis and to estimate the frequency of this phenomenon across populations. To do this, the presence of natural triploid individuals was evaluated in 13 seedling populations of cannabis using a flow cytometry analysis. Among the examined populations, natural triploids were identified in 10 groups with an average frequency of approximately 0.5%. The highest frequency of natural triploids was observed in a self-pollinated population at 2.3%. This research demonstrates that polyploidy is a naturally occurring event in cannabis and triploids are present at an average of approximately 0.5%, or 1 in 200 plants. These data shed light on the natural variation in ploidy within cannabis populations and contribute valuable insights to the understanding of cannabis genetics and breeding practices.

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Section: Discussionmentioning

confidence: 99%