Percorrer por autor "Guardiola, José Luís"
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- Fruit splitting in 'Nova' hybrid mandarin in relation to the anatomy of the fruit and fruit set treatmentsPublication . García-Luis, Amparo; Duarte, Amílcar; Porras, I.; Garcia-Liciónb, Angel; Guardiola, José LuísFruil splining in the mandarin orange cultivar ‘Nova’ is related lo lhe prescnce of an open stylar end in lhe fruit This opening arises from a cavily present at lhe base of lhe style, and is formed in a varjable proportion of fruits. The edis at lhe boltom of lhis styie cavily form a rind-lilce lissue which develop into a navel struclure. The size ofthis nave! is larger in open-slylar end bearing fruits and, according!y, ia sp!it fruil. The number of split fruil per tree is unrelaled to lhe number of fruit set. The application of gibberel!ic acid (GA,) has a variable effect on set and splitting depending on its timing. This hormone increases fruit sp!ilting when app!ied aI flowering, bel reduces it when applied shortly afler lhe end of lhe June drop. Ilhas on!y a minor effect on fruit seI.
- Melhoria da produtividade da clementina ‘Fina’, no Algarve.Publication . Trindade, D. T. G.; Duarte, Amílcar; Guardiola, José LuísA clementina ‘Fina’ é uma das tangerineiras mais cultivadas no Algarve. A baixa produtividade e o pequeno tamanho dos frutos deste cultivar, limitam os rendimentos do citricultor. Na tentativa de melhorar a produtividade desta clementina, foi realizado um ensaio, num pomar comercial, onde se estudou o efeito de aplicações hormonais de GA3 e de GA3+2,4-D. A aplicação de GA3 em plena floração aumentou o número de frutos vingados e provocou uma pequena redução do seu tamanho. O tratamento com GA3 +2,4-D reduziu o número de frutos vingados, em relação ao tratamento com GA3, mas estimulou o crescimento do fruto e aumentou o seu tamanho final. Podemos concluir que, no nosso ensaio, a aplicação conjunta de GA3 e 2,4-D constituiu o tratamento mais eficaz, na melhoria da produtividade da clementina ‘Fina’.
- The anatomy of the fruit in relation to the propensity of citrus species to splitPublication . García-Luis, Amparo; Duarte, Amílcar; Kanduser, Masa; Guardiola, José LuísThe anatomy of the fruit has been compared in three prone-to-split mandarin hybrids (Nova, Ellendale and Murcott), several cultivars of clementine mandarin (Fino, Clementina de Nules and Orogrande), and in Owari satsuma mandarin. The fruit of the hybrids is oblate to subglobose and usually presents an open stylar end disrupted by a navel formed by the floral meristem, which is conserved near the apex of the fruit. In the non-prone-to-split clementines as well as in Owari satsuma, the floral axis protrudes inside the style, and the flower meristem is lost through abscission shortly after petal fall. The abaxial side of the carpels fuses with the flower axis forming at the stylar end of the fruit a solid tissue which externally has a small scar at the place of style abscission. Most of the fruits in these cultivars have no navel. In addition, the fruit of clementine is slightly oblate or globose. The relevance of these anatomical characteristics as regards to splitting is supported by the differences between the split and non-split fruits in Nova, the split fruit being more oblate in shape and having a bigger navel than non-split fruit. However, the effect of applied growth regulators on fruit splitting could not be correlated with their effect on the anatomy of the fruit. Additional factors not contemplated in the study also influence fruit splitting.