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EFFECT OF GAMETAL SELECTION ON CORN PERFORMANCE

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Author(s): EDUARDO AUGUSTO BIGNOTTO | MAGNO ANTONIO PATTO RAMALHO | PEDRO HÉLIO ESTEVAM RIBEIRO

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 2;
Issue: 2;
Start page: 82;
Date: 2003;
Original page

Keywords: gametal selection | gain by selection | performance

ABSTRACT
If the kernels from the base of the ear are selected, the most vigorous pollens are indirectly being selected, considering that seeds placed at the base of the ear will have a better genetic constitution, because they are pollinated by more vigorous gametes. The length of the silk from the embryo sacs at the base is longer, compared to the length of those placed in the apex of the ear since each inflorescence receives thousands of pollen grains that certainly compete against each other. To test this hypothesis, the objective of the present work was to verify if the position of the kernel in the ear affected the grain yield and other traits of the plant differently and if that difference could be enlarged among the selective cycles. For this, in 1995/ 1996, 3.000 plants of the CMS-39 population were sowed in isolation and 300 ears were selected randomly. From each ear, kernels were collected from approximately three centimeters of the extremities. The ones from the apex were mixed and the same was done with those from the base. This procedure was repeated in five selective cycles in a similar way. The 10 subpopulations, five from the apex and five from the base, were evaluated in trials carried out in 2000/2001 and 2001/2002. The experimental design used randomized blocks with six replications in a split-plot scheme. The plots constituted the five selective cycles and the subplots the origin of the kernels, apex or base. The traits evaluated were the number of days for male and female flowering, ear height and grain yield. It was verified that the origin of the kernels from apex or base did not alter the expression of the evaluated traits. It was not possible, from the experimental precision obtained, to detect among all the considered traits, the effect of the indirect selection on the pollen vigor based on the position of the kernels in the ear.
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