Allelopathy of cover plants between vine rows
1992
Mikulas, J. | Polos, E. | Varadi, Gy. (Kerteszeti es Elelmiszeripari Egyetem (Hungary). Szoleszei es Boraszati Kutato Intezet)
Due to the competition for nutrients and water, and the effect of allelochemicals secreted by the roots, plants with a root system less than that of vines are best suited for use as cover plants. They should not grow too tall, nor cause plant protection problems in the vineyard, and they should suppress dangerous weeds by means of allelopathy or competition. Under Hungarian conditions, the weed species Digitaria sanguinalis, Glechoma recommended for the covering of vine rows. The allelochemicals of D. sanguinalis reduced the activity of the Hill reaction in chloroplasts isolated from the weeds Amaranthus retroflexus and Conyza canadensis to almost half, this degree of inhibition of the Hill reaction led to functional changes in the photosynthetic process. Among the cultivated plants, rye and sunflower proved suitable for the purpose, for the latter, the allelochemicals extracted from tissues of normal callus and of that transformed by Agrobacterium were found to have an inhibitory effect on the germination and root growth of Lepidium sativum.
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