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SUPPRESSION OF AXILLARY BUDS OF ITS HOST BY PARASITIZING CUSCUTA I. COMPETITION AMONG SINKS AND INDIRECT INHIBITION
Author(s) -
TSIVION Y.
Publication year - 1981
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1981.tb01693.x
Subject(s) - biology , cuscuta , xylem , axillary bud , host (biology) , shoot , competition (biology) , lateral shoot , parasite hosting , botany , sink (geography) , ecology , tissue culture , in vitro , biochemistry , cartography , world wide web , computer science , geography
SUMMARY The drastic inhibition of elongation imposed by parasitizing Cuscuta on the lateral shoots of a decapitated pea plant was studied in order to gain further understanding of the relationship between this parasite and its host. Reduction in host‐bud length was caused by the parasite as well as by a growing, partially shaded, lateral shoot of the host. The results were interpreted as competition between sinks on a common pool of photosynthates produced by the host. In such competition, the less efficient sink is weakened. An influence of the parasite which is not directly related to competition for nutrients is effected through the xylem of the host. This was demonstrated by inhibition of lateral buds by a parasite attached below a girdle that separated the buds from the parasite.