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Correlation analysis between the karyotypes and phenotypic traits of Chinese cymbidium cultivars
Huijuan Ning,Suyan Ao,Yirong Fan,Jianxin Fu,Chuanmei Xu 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.1
Chinese cymbidium are a group of valuable ornamental plants that is formed by genetically distinct species. Currently, arobust Chinese cymbidium classification system, such as that based on cytotaxonomy, is lacking. To investigate the geneticvariation within Chinese cymbidium, we selected 28 individual Chinese cymbidium cultivars as experimental materialto perform karyotype analysis. The results showed that chromosome number among these 28 cultivars was constant anddiploid (i.e., 2n = 40). In addition, no satellite chromosomes were observed. The karyotypes were more symmetrical andconsisted mainly of 1B and 2B types with a small number of 2A and 2C types. Based on principal component analysis, thefive karyotype parameters with the highest classification values were screened, which revealed that the mean of long to shortarm ratio, the mean relative length of long arms, and the asymmetry coefficient of karyotypes (As.K.) were reliable parametersfor use in Chinese cymbidium cytotaxonomy. Cluster analysis of karyotype parameters successfully identified cultivarsof the bamboo petal, narcissus petal, and plum petal types, thus confirming the accuracy of the cytological classificationsystem. Furthermore, flower traits of Chinese cymbidium were strongly correlated with karyotype parameters. Overall, weconclude that karyotype parameters can provide valuable information for studies on the classification, identification, andgenetic diversity of Chinese cymbidium.
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Jianxin Fu,Huijuan Ning,Chao Zhang,Yirong Fan 한국유전학회 2016 Genes & Genomics Vol.38 No.10
Normal and the spontaneous spirally rolled leaves of Cymbidium goeringii var. longibracteatum were used for RNA sequencing analyses using the Illumina paired-end sequencing technique to figure out the differently- expressed genes in two samples. About 5.65 and 4.82 Gb sequencing data of raw reads were obtained from 2 cDNA libraries of normal and the spirally rolled leaves respectively. After data filtering, quality checks and de novo assembly, a total of 48,935 unigenes with an average sequence length of 820 nt were generated. In addition, the transcriptome change in normal and the spirally rolled leaves was investigated. With non-redundant annotation, 219 differentially expressed genes (DEGs) are identified, with 147 up-regulated genes and 72 down-regulated genes. Out of these DEGs, 21 DEGs (9.59 %) were involved in cell wall modeling enzymes, such as expansin, xyloglucan endo-transglycosylase, pectate lyase, cell wall-associated hydrolase. Besides, other DEGs were predominantly classified as genes involved in transcription factor and signal sense and transduction signaling. This study presents the first comprehensive characterization of the leave transcriptomes of Cymbidium goeringii var. longibracteatum. This study not only gave us valuable sequence resources of this species, but also provided theoretical foundation for cultivar breeding of leaf mutation in C. goeringii var. longibracteatum.
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