منابع مشابه
Isolation and characterization of microsatellite markers for red elm (Ulmus rubra Muhl.) and cross-species amplification with Siberian elm (Ulmus pumila L.).
Ulmus pumila is an elm species, non-native to the USA that hybridizes with Ulmus rubra. In order to study the genetic structure and hybridization patterns between these two elm species, we developed 15 primer pairs for microsatellite loci in U. rubra and tested their cross-amplification in U. pumila. All 15 primers amplified in both species, 11 of which possessed species-specific alleles. Eight...
متن کاملSpecies specificity in pollen-pistil interactions.
For pollination to succeed, pollen must carry sperm through a variety of different floral tissues to access the ovules within the pistil. The pistil provides everything the pollen requires for success in this endeavor including distinct guidance cues and essential nutrients that allow the pollen tube to traverse enormous distances along a complex path to the unfertilized ovule. Although the pis...
متن کاملFast pollen tube growth in Conospermum species.
BACKGROUND AND AIMS An unusual form of pollen tube growth was observed for several Conospermum species (family Proteaceae). The rate of pollen tube growth, the number of tubes to emerge and the ultrastructure of these tubes are given here. METHODS Pollen was germinated in vitro in different sucrose concentrations and in the presence of calcium channel blockers, and tube emergence and growth w...
متن کاملToxicity ldentification Evaluations Phase IIToxicity ldentification Procedures for Samples Exhibiting Acute and Chronic Toxicity
This manual and itscompanionguidance documents describe a three phase aDDrOach for discharoers to identiiv the causes of toxicitv in municioal and industrial eifiuents (Phase I,EFA, 1991A: E+A, 1992:and Phase lil, EPA, 1993~). In 1989,the document titled Methods for Aquatic Toxicity Identification Evaluations: Phase I1 Toxlcify ldentification Procedures was published as a guidance document for ...
متن کاملMorphology and structure of the pollen cone and pollen grain of the Araucaria species from Argentina.
The pollen cone and the pollen grain of the two Argentinean species of Araucaria are described with LM, SEM and TEM. Primordia of pollen cones are formed in April and May and reach maturity by mid-October in A. angustifolia (Bert.) O. Kuntze and by mid-November in A. araucana. (Mol.) K. Koch. Characters of the mature pollen cones and microsporophylls between both taxa are clearly differentiated...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Danmarks Geologiske Undersøgelse IV. Række
سال: 1970
ISSN: 2597-3029,0366-9157
DOI: 10.34194/raekke4.v4.7008