LOPES, F. F. M.; http://lattes.cnpq.br/7474887413239360; LOPES, Fernanda Fernandes de Melo.
Resumo:
The castor plant there a long time is considered a culture of great importance is for
the Northeast of Brazil, has been winning great prominence at present time, due to
the chemistry ricin progress, with diversity of applications in the industry and for the
exploration as natural and renewable source of energy, in the biodiesel production.
One of the largest impediments faced in the castor plant production is scarce use of
improved seeds and of high quality; due to little knowledge and diffusion on such
materiais and for the high obtaining cost. Based on this, the objective of work was to
evaluate in four castor bean genotypes, being a variety (BRS 149 Nordestina) and
three hybrids (Savana, Lyra and Iris), his establishment capacity, with and without
the induction of the accelerated aging of seeds and initial growth. The experiment
was conducted in the National Center of Research of the Cotton (EMBRAPA/CNPA),
in Campina Grande, PB, in conditions of greenhouse, in the period of August to
December of 2004. The experimental design was in randomized blocks, with factorial
scheme 4x2, being four genotypes and two treatments of the seeds (normal and with
accelerated aging), in four replications. The analyzed variables were: initial
germination and vigor, plant height, stem diameter, leaf area, phytomass of root and
of shoot and shoot to root ratio. With the primary data of height, diameter and leaf
area, were determined the absolute and relative growth rates of the plants. The
accelerated aging reduced the germination significantly in 12% and the vigor in 22%,
of the seeds of the castor bean genotypes studied, and it affected the growth of the
plants of ali the genotypes negatively along the studied times. The largest
germination Indexes and vigor went to BRS 149 Nordestina (91 and 83%) and
normal seeds (92 and 79%). In relation to the height of the plants, the superiority was
of the genotype BRS 149 Nordestina and normal seeds, with an increment 12%. The
stem diameter of genotypes little varied, with superiority of BRS 149 Nordestina in
relationship the hybrid Savana, Lyra and Iris of 7; 13 and 10,5%. Beanning from the
37 days, the normal plants had an increment of approximately 6,7% in the stem
diameter. The smallest phytomass values root and shoot were observed for the íris.
The shoot to root radio and the volume of root went superiors to BRS 149 Nordestina.