Abstract

BRUNELE CALIMAN, Fabiano Ricardo et al. Intermittent CO₂ enrichment and analysis of dry matter accumulation and photoassimilate partitioning in tomato. Acta Agron. [online]. 2009, vol.58, n.3, pp.133-139. ISSN 0120-2812.

Intermittent CO₂ enrichment and analysis of the dry matter accumulation and photoassimilate partitioning in tomato submitted to grown in protected environment and field conditions. To assess dry matter (DM) accumulation and photoassimilate partitioning in tomatoes growth under different CO₂ concentrations an experiment was conducted in a randomized complete block design with 12 repetitions and two tomato hybrid cultivars cultivar (cv.) Andrea and Alambra. CO₂ intermittent enrichment (no enrichment during 10:30a.m. to 4:00p.m.) was provide by compost pile, and gas concentration range from 600 to 750 µl l^-1. The CO₂ enrichment only changed DM partition and accumulation of the stem in the cv. Alambra, leaving the other variables in both cultivars, insensible to the treatment. DM accumulation was higher in protected environments compared with the field conditions. The cultivar Andrea accumulated 786.39 g of DM pl^-1 in the CO₂ enriched environment, 815.49 g pl^-1 in the protected environment and 637.41 g pl^-1 in the field. The cv. Alambra accumulated 766.68 g of DM pl^-1 in CO₂ enriched environment, 824.35 g pl^-1 in the protected environment and 592.44 g pl^-1 in the field. The higher sink of photoassimilates were the fruits, which accumulated 59%, 63% and 72% of the plant DM in the CO₂ enriched environment, in the protected environment and in the field conditions, respectively.

Keywords : Lycopersicon esculentum; tomato; carbon dioxide; dry matter.

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