The current status of the work being conducted throughout the world in the field of iron deficiency in plants is reviewed in this book, which consists of research papers and invited lectures on specific topics related to iron deficiency. The book includes chapters reviewing the molecular and biochemical mechanisms elicited by iron deficiency in plants, algae and bacteria. Papers and reviews providing new information on the Strategy I-type and the Strategy II-type responses in higher plants are also included. Other chapters deal with new research directed towards finding possible means of controlling iron deficiency in crops of economic interest, including early diagnosis, fertilization, fertirrigation and plant breeding. Several papers involve the study of lime-induced iron chlorosis under semi-arid crop conditions in Mediterranean environments.