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中国科学院昆明植物研究所知识管理系统
Knowledge Management System of Kunming Institute of Botany,CAS
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许建初 [6]
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刘海洋 [6]
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6 could use lots of photosynthates, but contributed little to the accumulation of biomass. 4. Photosynthetic rate of P. armeniacum decreased a little at the noon, and the highest photosynthetic rate was observed at 10:00h in the greenhouse. The variation of photosynthetic rate was in the same trend as stomatal conductance. Higher relative humidity seemed to be the key for higher photosynthetic rate in P. armeniacum. 5. The photosynthetic capacity of C. flavum was statistically larger than that of P. armeniacum. The lower leaf photosynthetic capacity of P. armeniacum was related to its lower leaf nitrogen concentration,leaf phosphorus concentration and enzyme activities. Meanwhile, the extremely lower stomatal conductance and internal mesophyll conductance might greatly limit the photosynthetic capacity of P. armeniacum. The lower stomatal conductance and photosynthetic rate of Paphiopedilum might partially caused by the lack of chloroplasts in the guard cell of Paphiopedilum. Compared with C. flavum, P. armeniacum was more fond of shade environment.6. The short longevity leaf of Cypripedium had bigger photosynthetic capacity and greater potential for fast growth. But the longer LL of Paphiopedilum enhanced nutrient conservation which could compensate its lower photosynthetic capacity. The short longevity leaf of Cypripedium usually had higher photosynthetic rate per unit leaf mass and dark respiration rate, and photosynthetic capacity decreased fast with leaf age. However, for Paphiopedilum, the situation was the opposite. 7. Compared with Cypripedium, Paphiopedilum had higher water use efficiency and lower photosynthetic nitrogen use efficiency. 8. The leaf of Paphiopedilum had higher leaf construction cost and longer repayment time than that of Cypripedium. The leaf structures and physiological functions of Paphiopedilum and Cypripedium reflected the adaptation to their habitats. The leaf morphological and physiological evolution of Paphiopedilum was related to water and resource-conserving traits in the karst habitat. The leaf traits of Cypripedium were the adaptation to the environment rich in water and nutrients but easy to change with seasons.Our results provided evidence of divergent evolution of congeneric orchids under natural 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sect. Cyathophora is a distinctive group endemic to the eastern Himalaya-Hengduan Mountains region. It was regarded as a ‘grex’ or section and included all four general corolla types of Pedicularis. A unique feature is that the leaf and bract bases are fused together to form a cup-like structure around the stem at each node. Our molecular phylogenetic study indicated that P. sect. Cyathophora was a monophyletic lineage, although the relationships among species were not fully resolved. P. rex C. B. Clarke ex Maxim. is the most various and wide-distributed species in P. sect. Cyathophora. It is extremely variable in wild populations, and elicits a vast quantity of morpho-variations, which qualifies the species as one of the most diverse and complex taxa of the genus Pedicularis. In this study, the phylogeny of P. sect. Cyathophora was reconstructed based on four chloroplast genes (matK, rbcL, trnH-psbA, and trnL-F) and one nuclear gene, ITS, using 78 samples, with an emphasis on the P. rex complex. Also morphometric analyses were used to assess the morphological variation in P. rex complex and taxonomic revisions were presented for some taxa of this complex. Thirteen microsatellite markers were developed from three microsatellite-enriched libraries (AG, AC and AAG) of P. rex with a modified biotin-streptavidin capture technique, which could be used for further studies on the genetic diversity and population structure of this species and its congeners. Main results were summarized as follows: 1. Molecular phylogeny of P. sect. Cyathophora H. L. Li， The phylogeny of P. sect. Cyathophora was reconstructed based on chloroplast matK, rbcL, trnH-psbA, trnL-F and one nuclear gene, ITS, involving six species and 11 outgroups with a total of 78 samples. Our study showed that the monophyly of this group was strongly supported, in which P. superba was monophyletic based on chloroplast genes. The samples of P. cyathophylloides from Sichuan nested within P. cyathophylla. Ancient hybridization may occur between the two species. P. xiangchengensis is better to treat as a synonym of P. cyathophylla. Especially, P. ser. Reges was complicated, in which the individuals from different populations in the same species were rarely monophyletic. In addition, individuals forming monophyletic groups were not geographically close. In P. ser. Reges, lineage sorting of chloroplast DNA variations following rapid divergence is likely to have caused complex phylogeny of the taxa, which was reconstructed in our study. Hybridzation, introgression, lineage sorting and adaptive radiation may play important roles in the evolution of these taxa studied. Multiple, independent data sets are needed for resolving phylogenetic relationships of rapidly diverged lineages in P. sect. Cyathophora. 2. The taxonomic revision of P. rex complex，A total of 165 specimens with about 14 vegetative and eight reproductive characters were involved in the morphometric analysis. The results of PCA did not support six taxa for it emerged considerable morphological overlap. P. rex var. rockii was promoted to subspecies level for its prominent performance in PCA. Three taxa, P. rex subsp. pseudocyathus, P. rex subsp. zayuensis and P. rex subsp. parva, were merged into P. rex subsp. rex. Then P. rex subsp. lipskyana kept still at its rank for its purple red corolla color. The result of DA led to the selection of diagnostic traits between the P. rex and P. thamnophila. P. rex has less dissected leaves than P. thamnophila. P. rex is various in leaves number in whole, but P. thamnophila has stable three leaves in whole. Itpossesses a smaller corolla than P. rex. But P. thamnophila subsp. cupuliformis is a little different from P. thamnophila subsp. thamnophila in some vegetative characters, and it has purple stripes with the lower lip, so it is kept at the subspecies level. 3. Isolation and characterization of microsatellite loci from P. rex， We developed 13 microsatellite markers from three microsatellite-enriched libraries (AG, AC and AAG) of P. rex with a modified biotin-streptavidin capture technique. Polymorphism of each locus was assessed in 22 individuals with representation of five populations of P. rex. Additionally, among the 13 identified microsatellite markers, eleven of them were successfully amplified in species P. thamnophila, and five of them showed polymorphisms. This study may provide important information for further investigation on the population genetics, introduction and acclimatization of P. rex and its 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