INTERAÇÃO ENXERTO VS PORTA-ENXERTOS NA CULTURA DA SERINGUEIRA

The objective of the present work was to study the development of the aerial part and the root system and the nutritional situation in young rubber tree plants, selecting clones with greater vigor and desired characteristics in a rootstock, relating them to the reduction of production time of seedlings, increasing the degree of compatibility and consequently uniformity in order to know their potential for use as rootstock for commercial clones and guarantee the producer an adequate and uniform productivity during the bleeding period of his rubber plantation. The experiment was carried out at APTA Regional at Pindorama, São Paulo State, Brazil. The experiment was conducted in the nursery in plastic bags using a randomized block design with seven treatments and four replications. Each plot was composed of 120 plants, totaling 3360 useful plants. The treatments consisted of plants from the six clones PB 235, RRIM 600, GT 1, PR 261, IAN 873, Tjir 1 x Tjir 16 and unselected seeds (SNS). At 10 months all clones are ready for grafting. Clone IAN 873 presents grafting conditions at 8 months, with greater precocity compared to the others. Regarding the diameter of the stem, it can be said that the best results were respectively from the clones IAN 873, GT 1 and PB 235. That in the endosperm there was a higher concentration of zinc and copper. As for the concentration of calcium in the seed, a greater presence was observed in the shell, while the other macronutrients and total protein occurred in greater amounts in the endosperm. Within foliar nutrients, there is no significant difference between micronutrients. Keywords: Hevea Brasilienses, Genetic interactions, Clones.