Bioquímica e fitomassa de genótipos de porta-enxertos cítricos sob estresse salino.

Abstract

In order to study biochemical changes and biomass accumulation of citrus genotypes on salt stress. Were studied in a randomized block design, in factorial (2 x 5), two salinity leveis (0.3 and 4.0 dS m'l) and ave citrus rootstocks genotypes ('Sunki' mandarin [Citrus sunki(Hayata) hort ex Tanaka] common x citrange [C. sinensis (L.) Osbeck x Poncirus trifo]iata (L) Raf] 'Argentina' - 019 (TSKC x CTARG - 019); Rough lemon Florida (LRF) (Citrus jambhiri Lush)l tangerine 'Sunki' common x (Rangpur time C. limonia Osbeck x P. trifoliata) - 040 [TSKC x (LCR x TR) - 040]] Rangpur Santa Cruz (LCRSTC) (Citrus limonia Osbeck) and lemon Volkameriano (LVK) (C. Volkamer V. Ten & Pasq), with three replications and four working plants 90 days after sowing began the application of saline treatments that continued until 120 days after sowing time the plants were evaluated for ace biochemical characteristics and biomass accumulation of plants The TSKC x genotype (LCR x TR) -. 040, LCRSTC and LVK were the least affected by salt stress highlighting how materiais more tolerant to salinity. The LRF genotype did not influence the salinity in the synthesis of pigments, but dramatically reduced the biomass accumulation, highlighting how sensitive than the other genotypes. The TSKC genotype CTARG - 019 was the material that had the photosynthetic pigments and biomass most affected by salt stress, being among the materiais studied the most sensitive to salinity. Carotenoids alleviate the effects of salt stress in citrus plants.