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Effect of growth conditions on anatomy of pedicels and photosynthate partitioning in tomato plants with growth regulator treated flowers



Effect of growth conditions on anatomy of pedicels and photosynthate partitioning in tomato plants with growth regulator treated flowers



Acta Physiologiae Plantarum 12(1): 49-58



Tomato cultivars (Robin and Roma) grown in a greenhouse or in a phytotron, were examined at the early stages of fruit development. After inflorescence treatment with GA3, NOA or both (NG) promotion of green part of cluster growth preceded stimulation of fruit growth. In Robin cultivars synergistic effect of NOA and GA3 on peduncle and pedicel growth was observed. In Roma cv. stimulating effect of NG also dominated over all the other treatments. In both PGR treated cultivars, stimulation of pedicel thickening as well as internal phloem and xylem formation was observed, with some domination of plant response to NG. Xylem promotion by NG was greater in greenhouse plants than in phytotron ones. Anatomical modification (mainly promotion of conducting tissue production), as a response to influorescence treatment with PCR, preceded their stimulating effect on fruit growth. Transport of 14C-assimilates was estimated in detached fragments (a piece of stem with leaf and cluster) of PGR-treated Robin cv. Partitioning of 14C-photosynthates was related mainly with fruit size. In the NG series 14C-supply of much bigger fruits was strongly increased as compared wtih other series of PGR-treated plants with fruitlets, in spite of the fact that their conducting tissue area was already enlarged. In conclusion, at the early stage of fruit development, with low demand for photosynthates, the increase of the phloem and xylem area in pedicels in PGR-treated series was already observed, but without effect on their supply with assimilates. At that time partitioning of substances was regulated mainly by the sink size, affected only by NG.

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