Maximum storage duration for grafted tomato [Lycopersicon esculentum] plug seedlings under red-LED low light irradiation-CA conditions
2001
Fujiwara, K. (Chiba Univ. (Japan)) | Isobe, S. | Iimoto, M.
Grafted tomato (scion: Lycopersicon esculentum Mill. cv. Momotaro ; rootstock : cv. Helper M) plug seedlings were stored at 10degC for different durations (7, 14 or 21 d) under the optimum combination of CO2 concentration and photosynthetic photon flux density (PPFD) determined in a previous study (0.25% CO2 and 1.9micro mol mE-2 sE-1 PPFD continuous red light from light emitting diodes). The stored seedlings were transplanted and cultivated at 25degC and 200micro mol mE-2 sE-1 PPFD during the 16 h light period and at 20degC during the 8 h dark period for 28 d. The maximum storage duration was determined using strict criteria based on visual quality scores, aerial- and subterranean-part dry weights during storage, stem length, stem diameter, leaf number, aerial- and subterranean-part dry weights, required days to produce the first flower truss, first flower truss setting node and flower-bud number of the first flower truss during cultivation following storage. The results indicate that the maximum storage duration of grafted tomato plug seedlings stored at 10degC under the optimum combination of0.25% CO2 and 1.9micro mol mE-2 sE-1 PPFD was 21 d, and that the duration was at least three times longer than the duration for the seedlings stored at 10degC under conventional dark storage conditions.
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