MORPHOLOGICAL RESPONSES OF CROP AND WEED SPECIES OF DIFFERENT GROWTH FORMS TO ULTRAVIOLET-B RADIATION

UV-B exposure reduced leaf blade and internode lengths and increased leaf and axillary shoot production in several species. There was no clear distinction in the response of crops and weeds, though monocots were generally more responsive than dicots. In dense canopies changes in competitive balance resulting from increased UV-B might be expected more frequently when monocots are involved in mixtures, rather than mixtures of only dicots. -from Authors