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      Influência da remoção de cotilédones no desenvolvimento de ramificações nas axilas cotiledonares de plântulas de leguminosas Translated title: Effect of cotyledon removal on cotyledonal axillary shooting in seedlings of leguminosae

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          Abstract

          Experimentos inteiramente casualizados foram conduzidos em condições de viveiro com o objetivo de verificar a importância da permanência de cotilédones no desenvolvimento de ramificações nas axilas cotiledonares de plântulas de Phaseolus vulgaris L., Vigna unguiculata (L.) Walp., Leucaena leucocephala (Lam.) De Wit, Prosopis juliflora (Sw.), Tamarindus indica L. e Delonix regia L. Os tratamentos foram: remoção de ambos os cotilédones nos primeiro, segundo e terceiro dias da emergência, remoção de um só cotilédone no primeiro dia da emergência e não remoção de cotilédones. A recuperação do desenvolvimento em plântulas de P. vulgaris, avaliada através da ocorrência de ramificações, independe do número de cotilédones removidos no período de um a três dias da emergência, mas é menos eficiente que em V. unguiculata. A remoção de ambos os cotilédones em plântulas de V. unguiculata, no dia da emergência, afetou a recuperação do desenvolvimento dessas plântulas em comparação com os outros tratamentos. Em plântulas de L leucocephala, P. juliflora, T. indica e D. regia, a remoção de ambos os cotilédones, no período de um a três dias da emergência, sugere o aumento de mortalidade nessas plântulas. A remoção de um único cotilédone não afetou significativamente o percentual de sobrevivência das plântulas nem limitou o surgimento de brotações à axila cotiledonar correspondente ao cotilédone removido.

          Translated abstract

          Completely randomized experiments under greenhouse conditions were carried to study the role of cotyledons on the cotyledonal axillary shooting of Phaseolus vulgaris L., Vigna unguiculata (L.) Walp., Leucaena leucocephala (Lam.) De Wit, Prosopis juliflora (Sw.), Tamarindus indica L. and Delonix regia L. The seedlings underwent the following treatments: removal of both cotyledons on the first to the third day after emergence, removal of only one cotyledon on the first day of emergence, and no cotyledon removal. Growth recovery in P. vulgaris seedlings, as evaluated through shooting occurrence, is independent of the number of cotyledons removed on the first to the third day after emergence, but it was mostly less effective than that in V. unguiculata. Growth recovery in V. unguiculata seedlings was less effective when both cotyledons were removed on the first day of emergence as compared to the other treatments. In L. leucocephala, P. juliflora, T. indica, and D. regia seedlings, the removal of both cotyledons, on the first to the third day after emergence, suggests an increase in the mortality of seedlings. The removal of only one cotyledon did not significantly affect the percentage of seedling survival nor limit shooting to the corresponding axil of the removed cotyledon.

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          Most cited references19

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          Curso de Estatística experimental

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            The effects of seed size, cotyledon reserves, and herbivory on seedling survival and growth in Quercus rugosa and Q. laurina (Fagaceae).

            C Bonfil (1997)
            In a greenhouse experiment, seedling survival of two oak species (Quercus rugosa and Q. laurina) was greatly affected by the excision of cotyledons 1 mo after germination, with a greater impact on Q. laurina. The effect of seed size was also significant for both species, with a positive correlation between seed mass and survival and growth. The effect of cotyledon excision on seedling growth persisted throughout the first growing season in Q. rugosa and was not analyzed for Q. laurina due to the low number of seedlings that survived cotyledon excision. Seed size significantly affected seedling height, diameter, leaf area, and biomass at 6 mo. Seed size and cotyledon retention affected the ability of Q. rugosa to recover from herbivory, as both factors had a significant effect on relative growth rates after aerial biomass removal. The results show that seedlings originating from large seeds can better endure loss of cotyledons and aerial biomass and thus are better equipped to confront stress early in their lives.
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              Control of a symmetry-breaking process in the course of the morphogenesis of plantlets of Bidens pilosa L.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                abb
                Acta Botanica Brasilica
                Acta Bot. Bras.
                Sociedade Botânica do Brasil (Belo Horizonte )
                1677-941X
                December 1999
                : 13
                : 3
                : 243-249
                Affiliations
                [1 ] Escola Superior de Agricultura de Mossoró Brazil
                Article
                S0102-33061999000300003
                10.1590/S0102-33061999000300003
                c050a7cf-e168-4f5e-a71b-3630aa81216f

                http://creativecommons.org/licenses/by/4.0/

                History
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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0102-3306&lng=en
                Categories
                PLANT SCIENCES

                Plant science & Botany
                cotyledon removal,cotyledon function,seedling growth,leguminosae,remoção de cotilédones,função dos cotilédones,desenvolvimento de plântulas,leguminosas

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