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All meat has been grass. This statement of the old Greeks is still valid and thus plants contribute to the needs of a growing world popula tion. Their other key role for human life is reflected by their photosynthetic activity. Intensive agriculture reduces the carbon diox ide content of the atmosphere. The improvements of cultivated plants towards stable yields and desired quality characteristics are the sub jects of plant breeding. Here, an introductory picture of the present state of this topic in research and application is given. The senior author, H. Kuckuck, wrote the first edition in...