Leaf epidermal fingerprints of six species of Rhododendron （ Rh. Aureaum, Rh. dauricum, Rh. micranthum, Rh. Mucronulatum, Rh. Redowskianum, Rh. schlippenbachii） were observed by optical microscope with nail polish e...Leaf epidermal fingerprints of six species of Rhododendron （ Rh. Aureaum, Rh. dauricum, Rh. micranthum, Rh. Mucronulatum, Rh. Redowskianum, Rh. schlippenbachii） were observed by optical microscope with nail polish expression method in Key Laboratory of Forest Plant Ecology of Ministry Education China in Northeast Forestry University in 2004. The leaf morphological features including of stomata types, characters of guard cells, subsidiary cells in lower epidermis were observed. And ordinary cells （in shape and anticlinal walls feature） as well as the trichomes in both sides of the leaves are described in detail. The results showed that there were three types of stoma in six investigated Rhododendron species, from which Pericytic stomata type exists in three species （Rh. dauricum, Rh. micranthum, and Rh. mucronulatum）, Anomocytic stomatal type in Rh. Redowskianum, Diacytic stomata type in Rh. aureaum and Rh. schlippenbachii. The subsidiary cells of the Pericytic and Diacytic stomata type are different in shape and surface feature between the species, respectively. The ordinary epidermal cells show a variety from quadrangular to hexagonal, polygonal or irregular in surface view, the anticlinal walls are straight or sinuose. Trichomes （gland scales） are present in the both of the leaf sides in three species （Rh. dauricum, Rh. micranthum, and Rh. mucronulatum）. All of these detail leaf features show specific specificity of leave finger print for 6 rhododendrons.展开更多
Aerial surfaces of most land plants have epidermal hairs (trichomes).Both Arabidopsis thaliana trichomes and cotton fibers (seed hairs) are nonglandular hairs with unicellular structure.Here we out-line the recent pro...Aerial surfaces of most land plants have epidermal hairs (trichomes).Both Arabidopsis thaliana trichomes and cotton fibers (seed hairs) are nonglandular hairs with unicellular structure.Here we out-line the recent progress on molecular dissection of Arabidopsis trichome development,including the transcription factors regulating trichome initiation,phytohormones influencing trichome density,and the cytoskeleton formation system governing trichome morphogenesis.There is increasing evidence showing that these processes also control cotton fiber production.As several cotton fiber genes are able to rescue the Arabidopsis trichome mutants,we discuss the conservation between Arabidopsis trichome and cotton fiber development.展开更多
叶片吸收水分(foliar water uptake, FWU)是植物通过叶片"逆蒸腾作用"吸收和利用空气水分的现象。近年来, FWU一直是植物生理生态学领域的研究热点,几乎所有生态系统中的植物都存在FWU生理过程。FWU对植物个体、群落和生态系...叶片吸收水分(foliar water uptake, FWU)是植物通过叶片"逆蒸腾作用"吸收和利用空气水分的现象。近年来, FWU一直是植物生理生态学领域的研究热点,几乎所有生态系统中的植物都存在FWU生理过程。FWU对植物个体、群落和生态系统的水分及碳平衡起到了不可忽视的作用,尤其是在全球气候变暖导致干旱加剧的背景下, FWU备受关注。为此,本文总结了国内外研究具有FWU现象的各科物种数量、FWU过程和影响因素:(1)降雨和云雾导致空气相对湿度上升或土壤水势降低等外界环境因素;(2)叶片表面结构对水分的渗透影响;(3)叶片内部结构和物质通过改变叶片吸水速率和通量进而影响FWU。同时,本文归纳了FWU的生理生态学意义:FWU可通过提高植物叶片水势,增加气孔导度和光合速率等,促进植物的生存和生长发育。此外,在极端情况下,叶片吸收的水分还可以通过植物的维管系统进入到根系及根周的土壤中,具有改善土壤水分平衡和保持水土等作用。展开更多
Micromorphology of glandular hairs on the leaves of Salvia officinalis L. and Salvia triloba L. was investigated by light microscopy. We noticed similiarity and variation between the two species regarding morpholo...Micromorphology of glandular hairs on the leaves of Salvia officinalis L. and Salvia triloba L. was investigated by light microscopy. We noticed similiarity and variation between the two species regarding morphology of glandular trichomes. Two main types of glandular trichomes were identified on both species： peltate and capitate. Peltate trichomes consisted of a basal cell, one stalk cell and a large multisecretory head in S. officinalis L. In S. triloba L. peltate trichomes posses a basal cell, a short unicellular stalk, and a large secretory head with 8 secretory cells. In Salvia officinalis L., four types of capitate trichomes have been distinguished. Five types of capitate trichomes have been found in Salvia triloba L. The fifth type of capitate trichome, called digitiform trichome was found in S. triloba L. This determined interspecific diversity between the two Salvia species.展开更多
基金This work was supported by the Korea Research Foun-dation and The Korean Federation of Science and Technology Socities Grant funded by Korea Government (MOEHRD, Basic Research Promotion Fund), (Project No. 032-4-1).
文摘Leaf epidermal fingerprints of six species of Rhododendron （ Rh. Aureaum, Rh. dauricum, Rh. micranthum, Rh. Mucronulatum, Rh. Redowskianum, Rh. schlippenbachii） were observed by optical microscope with nail polish expression method in Key Laboratory of Forest Plant Ecology of Ministry Education China in Northeast Forestry University in 2004. The leaf morphological features including of stomata types, characters of guard cells, subsidiary cells in lower epidermis were observed. And ordinary cells （in shape and anticlinal walls feature） as well as the trichomes in both sides of the leaves are described in detail. The results showed that there were three types of stoma in six investigated Rhododendron species, from which Pericytic stomata type exists in three species （Rh. dauricum, Rh. micranthum, and Rh. mucronulatum）, Anomocytic stomatal type in Rh. Redowskianum, Diacytic stomata type in Rh. aureaum and Rh. schlippenbachii. The subsidiary cells of the Pericytic and Diacytic stomata type are different in shape and surface feature between the species, respectively. The ordinary epidermal cells show a variety from quadrangular to hexagonal, polygonal or irregular in surface view, the anticlinal walls are straight or sinuose. Trichomes （gland scales） are present in the both of the leaf sides in three species （Rh. dauricum, Rh. micranthum, and Rh. mucronulatum）. All of these detail leaf features show specific specificity of leave finger print for 6 rhododendrons.
基金The National High-tech Research Program of China (Grant Nos. 2003AA222050 and 2006AA10A109)the National Key Basic Research Pro-gram of China (Grant No. 2002CB111303)
文摘Aerial surfaces of most land plants have epidermal hairs (trichomes).Both Arabidopsis thaliana trichomes and cotton fibers (seed hairs) are nonglandular hairs with unicellular structure.Here we out-line the recent progress on molecular dissection of Arabidopsis trichome development,including the transcription factors regulating trichome initiation,phytohormones influencing trichome density,and the cytoskeleton formation system governing trichome morphogenesis.There is increasing evidence showing that these processes also control cotton fiber production.As several cotton fiber genes are able to rescue the Arabidopsis trichome mutants,we discuss the conservation between Arabidopsis trichome and cotton fiber development.
文摘Micromorphology of glandular hairs on the leaves of Salvia officinalis L. and Salvia triloba L. was investigated by light microscopy. We noticed similiarity and variation between the two species regarding morphology of glandular trichomes. Two main types of glandular trichomes were identified on both species： peltate and capitate. Peltate trichomes consisted of a basal cell, one stalk cell and a large multisecretory head in S. officinalis L. In S. triloba L. peltate trichomes posses a basal cell, a short unicellular stalk, and a large secretory head with 8 secretory cells. In Salvia officinalis L., four types of capitate trichomes have been distinguished. Five types of capitate trichomes have been found in Salvia triloba L. The fifth type of capitate trichome, called digitiform trichome was found in S. triloba L. This determined interspecific diversity between the two Salvia species.
