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Colony Size of Tuberolachnus salignus (Gmelin) in Relation to Mass Transport of 14 C‐labelled Assimilates from the Leaves in Willow
Author(s) -
Peel A. J.,
Ho L. C.
Publication year - 1970
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1970.tb08877.x
Subject(s) - honeydew , willow , cutting , biology , sieve tube element , botany , sieve (category theory) , horticulture , aphid , shoot , bark (sound) , phloem , ecology , mathematics , combinatorics
Willow cuttings were used in which u narrow, longitudinal strip of bark was removed commencing from the base of the leafy shoot. Aphid colonies of different sizes were then sited on the stem either side of the strip, 10 cm below the base of the shoot. The leaves were allowed to assimilate 14CO2, and the dry weight and total activity of the honeydew from each colony was measured over a given period of time. It was found that not only did the total activity from the large colony exceed that of the small colony, but that the specific activity of the honeydew from the large colony was higher than that from the small colony. This has been taken as evidence that neighbouring pierced sieve tubes do not act independently of each other; mutual interference occurs. Increasing the distance between pierced sieve elements by dispersing the members of the large colony over a greater area of stem, did not apparently reduce interference effects. The results are explained in relation to the magnitude of the contributory length (Peel and Wealherley 1962), of individual sieve tubes pierced by the large, as opposed to the small colony.