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Google Scholar A search engine for academic and scientific text.
Agricola A search engine via the USDA National Agriculture Library
AGRIS/CARIS Agriculture Publications Database (at the FAO)
Plantstress Reference Database (See the left panel: only articles on plant abiotic stress)
Botanical Dermatology Database -- A family-by-family description of plants and the key chemicals that they produce
Botany Tutorials Extensive collection of online resources, for teaching also.
Crop Nutrition A premier soil fertility information resource
Ecotox A database that includes effects of toxic substances on plants (from EPA)
Global Plant Breeding A US website for plant breeders
GrainGenes -- The small grains database
Kimball Plant Biology links Extensive links.
Photographic Atlas of Plant Anatomy -- Covering an impressive range of 53 topics in plant anatomy
Plant ecology book Free download (large file)
Plant Pathology online The American Phytopathological Society
PlantFacts a database to search for plant information from many Universities in the USA
Plants in Action -- Free on-line extensive plant biology textbook by Australian and NZ plant scientists
Plants-In-Motion You read the book now see the movie.
Science and plants Pre-college level educational materials on plants
US National Agricultural Library -- More than just a library
World Water Links Plants need water
Flowering Plant Gateway Four systems of flowering plant classification
Multilingual Plant Names Plant names in various languages
The Families of Flowering Plants by L. Watson and M. J. Dallwitz
Metabolism and Biochemistry
Biochemical and Metabolical Pathways A searchable index, and more.
MetaCyc -- Database of nonredundant, experimentally elucidated metabolic pathways from more than 300 different organisms
Heredity and DNA -- A multimedia tutorial.
Introduction to Genetic Analysis Textbook online
Mendelian Genetics A free distance learning by Dr Jamie Love
Photosynthesis on the Web - A well received portal by Larry Orr and Govindjee
Plant hormones in a nutshell
Plant Physiology on line book by Taiz and Zeiger
The Online Biology Books Free download
Analysis of Metabolites From the GCP
Fast Plants an introduction to growing and experimenting with Arabidopsis thaliana plants.
MaxChelator -- Buffer and chelate software
Methods in Plant Histology The classical book (online), still useful.
Microscopy -- Virtual library of microscopy
Molecular Biology Techniques -- A hot list of molecular biology techniques on the web
PrometheusWiki A web resource for methods and protocols in plant physiology & ecology.
Protocols For Recombinant DNA Isolation, Cloning, And Sequencing A complete hypertext manual
Protocols online General biology lab reference book (extensive).
Springer Protocols -- Search for published protocols in Springer publications
BIOLOGY, PLANT BREEDING AND AGRICULTURE SOFTWARE
Agronomix Plant Breeding and crops software
Plant Breeding software From Wageningen University
Hands on Genetics -- Instructional software for basic genetics.
IRRISTAT Statistics package downloadable from IRRI
Field-book for your Android tablet By Kansas State University team.
LocClim - Local Climate Estimator tool, by FAO.
Periodic table of elements -- Dynamic
World Climate- Essential climatic data by city/town (worldwide)