Potencial de progênies de citros na geração de variedades porta-enxerto

Abstract

This work aimed to evaluate citrus progenies, provided footed francs (plants from seeds or seedlings) concerning the fruit set rate, the mortality rate of individuals obtained, the strength of the hybrid (visual, plant height and stem diameter), the reaction to water stress and the virus-the-sadness-of-citrus (Citrus tristeza virus - CTV), to verify the potential of obtaining varieties of rootstock. Nine progenies were studied, comprising 461 seedlings hybrids resulting from crosses, having as female parents the lemon tree 'Rangpur Santa Cruz' (LCRSTC) and the tangerine tree 'Sunki Florida' (TSKFL) and as male parents, besides that last tangerine, the citrandarins 'Indio' (CTID) and 'Riverside' (CTRS), the citrangequat 'Thomasville' (THOM), the Swingle 'Swingle' (CTSW), the citrange 'Argentina' (CTARG) and the 'Benecke' selection from Poncirus trifoliata (TRBK). The progenies having as the female parent 'Sunki Florida' showed the highest rate of fruit set, and zero mortality rate in TSKFL x TRBK intersection. The LCRSTC x TSKFL progenies TSKFL x TRBK and TSKFL x CTARG were highlights in vigor assessments (visual, height and diameter). The LCRSTC x CTID progenies LCRSTC x CTRS, TSKFL x CTID and TSKFL x CTARG showed less sensitivity to water stress and LCRSTC x TSKFL, TSKFL x CTID and TSKFL x CTARG better use of water, based on certain shoots emission immediately after occurring subsequent to heavy rainfall periods of water stress. Regarding the reaction to CTV, none of the progeny has trained intolerant individuals, highlighting LCRSTC x TSKFL, LCRSTC x CTRS and LCRSTC x THOM, in which 80% of their subjects were classified as resistant.