Effects of ethylene and sucrose on translocation of dry matter and 14C-sucrose in the cut flower of the glasshouse carnation (Dianthus caryophyllus) during senescence

Nichols, R.; Ho, L.C.

Annals of Botany 39(160): 287-296

1975


ISSN/ISBN: 0305-7364
DOI: 10.1093/oxfordjournals.aob.a084942
Accession: 000079041

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Abstract
The translocation and distribution of dry matter were studied in the floral and vegetative parts of cut carnations during senescence. The change in dry weights of the tissues and the amount of radioactivity recovered from them after feeding with 14C-sucrose were measured. Treatments with ethylene and sucrose were used to alter the rate of flower senescence. Sucrose moved through the stem relatively unchanged but was rapidly inverted and metabolized in the petals. During natural aging 14C moved from the stem to the flower and the movement was enhanced by exogeneous sucrose, which also reduced the loss of dry matter in the petals and promoted their growth. Treatment with ethylene caused petals to wilt and lose dry weight, and ovaries to enlarge and increase in dry weight. The distribution of radioactivity in flowers fed with 14C-sucrose before and after ethylene treatment supported the observation that dry matter was translocated between the flower parts. The results indicate that a change in the source-sink relationships of the flower parts contributes to the factors that determine the rate of flower senescence.