Sprouting ability and seasonal changes of sugar concentrations in rhizomes of <i>Calystegia sepium<\i> and roots of <i>Convolvulus arvensis<\i>

Publikations-Art

Arbeitspapier/Diskussionspapier

Autoren

Leonie Willeke; Hansjoerg Krähmer; Wilhelm Claupein; Roland Gerhards

Erscheinungsjahr

2015

Veröffentlicht in

Journal of Plant Diseases and Protection

Band/Volume

122/3

ISBN / ISSN / eISSN

1861-3837

Seite (von - bis)

133-140

Factors influencing the sprouting ability of rhizome pieces of Calystegia sepium and root pieces of Convolvulus arvensis were analyzed in four experiments. In the first experiment,sprouting was investigated as a function of bud number. About half of the rhizome and root pieces with one budcould sprout. Almost all pieces with 6 or more buds sprouted.Mostly several buds sprouted in longer rhizome and root pieces. In the second experiment, sprouting of rhizomes and roots was measured in dependence of burial depth in the soil. With increasing depth, the sprouting ability of about 10 cm long rhizome and root pieces decreased. From deeper than 35 cm for C. sepium and 30 cm for C. arvensis no new shoots emerged. This shows that common shallow tillagepractices are mostly not sufficient to suppress vegetativeregeneration of these two weed species. In the third experiment, rhizome and root pieces were collected in the field and their sprouting ability was examined in the greenhouseover the season. Rhizomes of C. sepium and the roots of C. arvensis were dormant in the winter and sprouting washighest in April and May. In the fourth trial, seasonal changesof sugar concentrations were studied in the rhizomes androots. It was found that concentrations of fructose, glucose and saccharose were highest and starch rates were lowest in mid-June for both species. We assume that this time corresponds to the optimum time for herbicide translocation in the roots/rhizomes.