共查询到20条相似文献,搜索用时 93 毫秒
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中国的一个新记录属——冠生刺菌属 总被引:2,自引:0,他引:2
基于采自滇中哀牢山区的标本 ,报道我国的一个新记录属———冠生刺菌属CreolophusP .Karst.,并根据其主要特征把齿耳属SteccherinumGray的肉齿耳S .cir rhatum (Pers.exFr .)Teng归并到Creolophus属中。同时对有争议的相似种C .cirrhatus (Pers .exFr .)Karst.和C .corrugatum (Fr.)P .Karst.(=HydnumcorrugatumFr.)进行了比较研究 ,根据盖缘是否具有生殖能力的菌刺 ,提出两者应作为不同的种来处理。 相似文献
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描述了芭蕉属(芭蕉科)一新变种——雷波野芭蕉(Musa luteola J.L.Liu var.leiboensis J.L.Liu et Q.Luo),并绘制了形态图。新变种以其叶基部渐狭至楔形,叶柄和叶鞘两侧具纸质或干膜质的翅,花序下垂,椭圆形或卵状椭圆形,先端圆,苞片外面淡黄色或绿黄色,先端圆或钝圆,每苞片内有花二列,果序球状、近球状或椭圆状球形,果实密集与黄色野芭蕉(Musa luteola J.L.Liu)相近似,但主要又以子房具5~9钝状棱角,浆果较大,长(6.7~)8.5~11.9 cm,宽5~7.2 cm,具5~9钝状棱角,果梗较长1~1.5 cm而有显著区别。 相似文献
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中国草莓属( Fragaria) 植物的分类研究 总被引:15,自引:0,他引:15
中国是世界上野生草莓种类最丰富的国家。近20年来, 从国内外收集保存了103份野生草莓资源, 鉴定出我国自然分布有11个种, 约占世界草莓属植物20个种的一半。这11个种包括8个二倍体种: 森林草莓(Fragaria vesca L. ) 、黄毛草莓( F. nilgrrensis Schlecht. ) 、五叶草莓( F. pentaphylla Lozinsk. ) 、纤细草莓( F. gracilis Lozinsk. ) 、西藏草莓( F. nubicola Lindl. ) 、绿色草莓( F. viridis Duch. ) 、裂萼草莓( F. daltoniana Gay) 、东北草莓( F. m andschurica Staudt) 和3个四倍体种: 东方草莓( F. orientalis Lozinsk. ) 、西南草莓〔F. m oupinensis ( Franch. ) Card. 〕、伞房草莓( F. corymbosa Lozinsk. ) 。对我国原产野生草莓种类进行了较系统的性状描述和分类研究, 并列出了我国野生草莓分种检索表。提出我国分布有11个种的结论比以前记载的8个种更全面和完整。 相似文献
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玫瑰、月季、蔷薇等蔷薇属植物RAPD分析 总被引:23,自引:2,他引:23
对蔷薇属的玫瑰、月季、蔷薇3 个种的15 个品种进行RAPD 分析, 16 个引物对受试品种PCR扩增共获得202 条谱带, 其中123 条(60. 9 %) 表现多态性。利用UPGAMA 法构建分子系统进化树, 以相似性系数0. 5 为阈值, 玫瑰与月季为一个聚类组, 蔷薇为另一个聚类组; 以相似性系数0. 6 为阈值, 4个蔷薇品种分为4 个不同的聚类组, 5 个月季品种为一个聚类组, 5 个玫瑰品种为一个聚类组, 平阴紫枝玫瑰单独为一个聚类组, 表明玫瑰与月季的亲缘关系较近, 两者与蔷薇的亲缘关系较远。 相似文献
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Opisthopappus taihangensis is an endangered species endemic to China and represents an important genetic resource for chrysanthemum improvement. We describe here its basic reproductive characteristics. The anthers are tetrasporangiate and the anther wall is composed of an epidermis, endothecium, middle layer and tapetum. The middle layer is lost by the microspore tetrad stage, and the tapetum disintegrates at the trinucleate pollen stage. Meiosis in the microspore mother cells is of the simultaneous type, and the tetrad is tetrahedral in shape. Mature pollen grains have three germinal apertures, two sperm nuclei and one vegetative nucleus. The in vitro pollen germination rate is only ∼10%. The ovule is anatropous, dual-integument, tenuinucellatae and the development of the embryo sac follows the Oenothera pattern. The archesporial cell below the nucellus epidermis functions as the megaspore mother cell and forms a linear tetrad. The embryo passes through a globular, heart and torpedo stage before maturing into a cotyledon embryo. The endangerment of O. taihangensis may be associated with low reproductive capacity, as a consequence of poor pollen viability. 相似文献
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通过测定长春市6种常见绿化植物净光合速率及绿量,计算出其固碳释氧能力,并运用碳税法及工业制氧成本法计算此6种树木日固碳释氧价值。结果表明:所选6种植物中,京桃(Prunuspersicafrubro-plena)、银中杨(Poplusalba’Berolinensis’L.)固碳释氧能力最强,其日固碳释氧价值最高,火炬树(RhustyphinaNutt)、(Prunusarmeniaca)、樟子松(Pinussylvestrisvar.mongolicaLitv.)、旱柳(salixma㈨dana)固碳释氧能力较弱,目固碳释氧价值最低。 相似文献
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Invasive alien species can pose a severe threat to biodiversity and stability of the ecosystems they invade. Predicting distribution
patterns of invasive species in regions outside their native range is a fundamental component of early warning systems. Crofton
weed (Eupatorium adenophorum Spreng.) was first discovered in the Yunnan Province of China around the 1940s. The well-documented invasion history of this
plant species provided the opportunity for us to examine the spatiotemporal patterns of biological invasion by crofton weed.
Using the datasets documenting 441 known localities invaded by crofton weed in China over the past 50 years and 23 environmental
variables generated by the genetic algorithm for rule-set production (GARP) model, we tested the predictability of crofton
weed distribution with a high degree of accuracy. Both the Kappa statistics and the receiver–operator characteristic (ROC)
analysis indicated that it is possible to predict the geographical spread of crofton weed in China. Precipitation in the coldest
quarter of the year, extremely low air temperature, and maximum annual air temperature strongly influenced the predictions.
Our results indicate that crofton weed may break out in Yungui Plateau, Sichuan Basin, southeastern Coastlands, Hainan Island,
and Taiwan although currently it is either absent or has only recently been recorded in these regions. Redundancy analysis
(RDA) ordination results demonstrated that temperature and precipitation play an important role in confining the spread of
crofton weed. Over the past 20 years, crofton weed has spread from subtropical areas with higher annual mean temperature and
lower climatic fluctuations to much cooler and dryer areas at higher altitudes. The distribution of crofton weed was restricted
mainly to regions with mean annual air temperature ranging from 10 to 22°C and annual precipitation from 800 to 2000 mm. Our
results could help in developing and implementing early detection measures to minimize the ecological impacts of crofton weed
invasion in China. 相似文献
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Seedlings of a Chinese wild grape (Vitis piasezkii Maxim var. pagnucii) native to loess plateau of Eastern Gansu province, China, were evaluated to screen cold-resistant rootstocks in Lanzhou area. After 14-year investigation two selections of LDP-191and LDP-294 were screened as rootstocks for two table grape cultivars, ‘Fujiminori’ and ‘Red Globe’, respectively. The two graft unions demonstrated very high cold-resistance as well as good graft compatibility. Furthermore, they could survive through low temperatures in winter without soil coverage together with good fruit quality of the cultivars grafted. 相似文献