Selection of clones and parents for the breeding of resistance to the sugar cane leaf yellows phytoplasma (SCYP)
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Abstract
yellows phytoplasma (SCYP)», was evaluated in 733 clones of
26 biparental families of the breeding program of sugarcane of
the year 2006 in Cuba. The objective was to determine in the
Stage of Clonal lot 1, the incidence of the SCYP through natural
infection in order to select resistant clones to this disease and
also to identify the parents that give origin to progenies with
low incidence of this disease. The natural infection by SCYP in
the initial stages of the selection scheme increased with the
age of the plant, as well as the severity of the disease. It was
recorded the presence of symptoms in the 26,6 and 80,42 %
respectively of the evaluated clones at 6 and 18 months of age,
resulting that the natural infection could be used to select
resistant clones to the SCYP. From all the studied combinations,
C86-12 x B45181, C86-503 x B6368 and C86-456 x B45181, resulted
the progenies with the lowest incidence of SCYP. The parents
used as feminine C86-12 and C86-503 and those used as
masculine B6368 and B45181, showed the lowest frequencies
in incidence of SCYP in their descendants. The natural infection
of the SCYP was grown in the parents of the biparental families
evaluated, in most of them with high incidence.
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