Ecofisiologia de combinações copa/porta-enxerto de citros sob salinidade da água até a pré-floração.

Abstract

Citrus plants have great socioeconomic importance in Brazil and in the world, however, In regions with qualitative and quantitative water limitations, the example, in location of semiariárido, There need for management strategies that improve crop performance. With that, the objective of this study was to evaluate the ecophysiology of citrus genotypes of progenies of crossing gives mandarina Sunki 'with lemon' blackhead 'and Poncirus trioliata, Being combined with the acidic file 'Tahiti' as a scullery Being combined with the acidic file 'Tahiti how scullery, All obtained Together The, In Cross of Almas, BA. The experiment was carried out under field conditions, At the Federal University of Campina Grande (UFCG), Pombal PB fields, Em lisímetro de drenagem com capacidade de 150 dm3, Studying 10 scullery/rootstock combinations, Referring to Tahiti grafted on 10 citrus genotypes (nine hybrids and one witness) Irrigated with two water salinity levels (CEa) (S1 = 0.3 and S2 = 3.0 dS m-1) Making a 10 x 2 factorial scheme The experimental design was a randomized block design, With 3 replicates and each plot consisting of a useful plant, totalizing 60 Parcel. The grafted seedlings were transplanted at one year of age from the sowing, Being the beginning of the applications of the saline stress to the 15 days after the transplant lasting until the period of prefloração, That is, up to 195 days after transplanting, During this period the plants were analyzed for growth, Gaseous Exchanges, Chlorophyll fluorescence a. Irrigation with 3.0 dS m-1 saline water did not influence photosynthetic activity of the citrus canopy / rootstock combinations studied until pre-chlorination; The highest growths were obtained by the combinations in between The Tahiti acid file with TSKC x (LCR x TR) - 017, TSKFL x TRBK - 011 and TSKFL x TRBK - 030, even under a higher salinity level; The highest reductions in growth as a function of salinity are observed in the combinations composed of Tahiti grafted TSKC x (LCR x TR) - 032, TSKFL x TRBK - 028 and the LCRSTC control, the latter being the most sensitive to salinity; The combinations less sensitive to salinity were composed of Tahiti 'grafted with TSKFL x (LCR x TR) - 018, TSKFL x TRBK - 011, TSKFL x TRBK – 30.