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In Vitro Culture of Trees
Woody plants provide many challenges to the tissue culturist. Although there are many excellent tissue culture books and manuals available, these are generally strongly biased towards herbacious crops. Consequently, they often do not pay sufficient attention to the problems that specifically apply to in vitro culture of tree species. Culture of the latter often poses problems which are either absent or of lesser significance when culturing herbacious species. When trees in the field are used as explant source, the problems can be especially severe. For example, the physiological condition of the explants is difficult to control because of variation in weather and biotic factors. Furthermore,...
New Perspectives on the Biology of Nectaries and Nectars
The number of currently known, described and accepted plant species is ca 374,000, of which approximately 295,00 (79%) are angiosperms. Almost 90% of this huge number of flowering plants is pollinated by animals (mostly insects) via nectar-mediated interactions. Notably, three-fourths of the leading global crop plants produce nectar and are animal pollinated, which is estimated to account for one-third of human food resources. Nectar can also be produced on tissues outside of flowers, by so-called extrafloral nectaries, and commonly mediate interactions with ‘body-guard’ ants and other pugnacious insects that defend the plant from herbivores. Extrafloral nectar is present in almost 4,000...
Science Dimension
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The North American Guide to Common Poisonous Plants and Mushrooms
If people knew how many poisonous plants are commonly found in homes and gardens, they'd be shocked. Plants as common as monkshood, castorbean, and oleander are not just dangerous, they're deadly. The North American Guide to Common Poisonous Plants and Mushrooms is a comprehensive, easy-to-use handbook. The book is split into four main categories: mushrooms, wild plants, ornamental and crop plants, and houseplants. Each plant entry includes a clear photograph to aid the task of identification, a description of the plant, notes on where they commonly occur, and a description of their toxic properties. Plants are listed by common name to assist the non-specialist.
