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Cai Y.-F.,Yunnan Academy of Agricultural Sciences | Cai Y.-F.,Yunnan Flower Breeding Key Laboratory | Cai Y.-F.,Yunnan Flower Research and Development Center | Li S.-F.,Yunnan Academy of Agricultural Sciences | And 8 more authors.
Botanical Studies | Year: 2014

Background: Rhododendron is one of the most well-known alpine flowers. In order to identify performances relating to Rhododendron's natural habitats we investigated the leaf anatomical structures and photosynthetic characteristics of R. yunnanense, R. irroratum and R. delavayi, which showed different responses after being transplanted into a common environment. Results: When compared with R. irroratum and R. delavayi, R. yunnanense had lower leaf dry mass per unit area (LMA) and larger stomata, but smaller stomatal density (SD) and total stomata apparatus area percent (At), lower stomatal conductance (Gs), transpiration rate (Tr), light compensation point (LCP), light saturation point (LSP), light-saturated photosynthetic rate (Amax) and leaf nitrogen content per unit area (Na). LMA was positively correlated with Amax and maximum rates of carboxylation (Vcmax). However, leaf N content was not significantly correlated with Amax. Thus, the variation in leaf photosynthesis among species was regulated largely by changes in LMA, rather than the concent of nitrogen in leaf tissue. Conclusions: R. yunnanense plants are vulnerable to moisture and light stress, while R. irroratum and R. delavayi are better suited to dry and high radiation environments. The present results contribute to our understanding physiological trait divergence in Rhododendron, as well benefit introduction and domestication efforts for the three species of Rhododendron studied in this work. © 2014 Cai et al. Source

Wang J.-H.,Yunnan Academy of Agricultural Sciences | Wang J.-H.,Key Laboratory of Yunnan Flower Breeding | Wang J.-H.,Yunnan Flower Research and Development Center | Li S.-C.,Yunnan Academy of Agricultural Sciences | And 14 more authors.
Physiologia Plantarum | Year: 2013

Cyclic electron flow (CEF) plays an important role in photoprotection for angiosperms under environmental stresses. However, ferns are more sensitive to drought and their water transport systems are not as efficient as those of angiosperms, it is unclear whether CEF also contributes to photoprotection in these plants. Using Microsorum punctatum and Paraleptochillus decurrens, we studied the electron fluxes through both photosystem I (PSI) and photosystem II (PSII) under water stress and their leaf anatomies. Our goal was to determine if CEF functions in the photoprotection of these ferns and, if so, whether CEF stimulation is related to leaf anatomy. Compared with P. decurrens, M. punctatum had thicker leaves and cuticles and higher water storage capacity, but lower stomatal density and slower rate of water loss. During induced drought, the decrease in leaf water potential (Ψleaf) was more pronounced in P. decurrens than in M. punctatum. For both species, the decline in Ψleaf was associated with a lower effective PSII quantum yield, photochemical quantum yield of PSI and electron transport rate (ETR), whereas increases were found in the quantum yield of regulated energy dissipation, CEF and CEF/ETR(II) ratio. Values for CEF and the CEF/ETR(II) ratio peaked in M. punctatum at a light intensity of 500-600 μmol m-2 s-1 vs only 150-200 μmol m-2 s-1 in P. decurrens. Therefore, our results indicate that the stimulation of CEF in tropical ferns contributes to their photoprotection under water stress, and is related to their respective drought tolerance and leaf anatomy. © Physiologia Plantarum 2012. Source

Peng L.-C.,Yunnan Academy of Agricultural Sciences | Peng L.-C.,Supervision and Testing Center for Flowers of Ministry of Agriculture Kunming | Peng L.-C.,Yunnan Flower Breeding Key Laboratory | Peng L.-C.,Yunnan Flower Research and Development Center | And 20 more authors.
Zhiwu Shengli Xuebao/Plant Physiology Journal | Year: 2013

The plant regeneration system of Ormosia fordiana Oliv. was studied with the pretreatment and germination induction of seed, multiplication and hardening of adventitious bud, rooting of the shoot. The results showed that the best seed germination medium was MS (Read)+6-BA 0.5 mg·L-1+NAA 0.1 mg·L-1 with 100% of germination rate, and the best multiplication medium was Read+6-BA 1.0-1.5 mg·L-1+KT 0.1 mg·L-1+NAA 0.1 mg·L-1 which has more than twenty-three multiplication buds in each bottle. Read+6-BA 0-0.5 mg·L-1+ NAA 0.1 mg·L-1 was the best hardening medium. The best rooting medium was Read+IAA 1.0 mg·L-1 with 90.54% of the rooting rate. The research would promote the reproductive efficiency of Ormosia fordiana Oliv.. It improved the maturity and application of large-scale seedling technology, and had the vital significance on development and application of Ormosia fordiana Oliv.. Source

Li H.,Yunnan University | Li H.,Yunnan Academy of Agricultural Sciences | Li H.,National Engineering Research Center for Ornamental Horticulture | Li H.,Yunnan Flower Research and Development Center | And 22 more authors.
Mitochondrial DNA | Year: 2014

The complete nucleotide sequence of the sugar beet (Beta vulgaris ssp. vulgaris) chloroplast genome (cpDNA) was determined in this study. The cpDNA was 149,637 bp in length, containing a pair of 24,439 bp inverted repeat regions (IR), which were separated by small and large single copy regions (SSC and LSC) of 17,701 and 83,057 bp, respectively. 53.4% of the sugar beet cpDNA consisted of gene coding regions (protein coding and RNA genes). The gene content and relative positions of 113 individual genes (79 protein encoding genes, 30 tRNA genes, 4 rRNA genes) were almost identical to those of tabacoo cpDNA. The overall AT contents of the sugar beet cpDNA were 63.6% and in the LSC, SSC and IR regions were 65.9%, 70.8% and 57.8%, respectively. Fifteen genes contained one intron, while three genes had two introns. © 2014 Informa UK Ltd. Source

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