Estimativas dos efeitos da seleção recorrente intra e interpopulacional em linhagens de milho (&gt;i&lt;Zea mays&gt;/i&lt; L.)&gt;/b&lt;&gt;/p&lt;

Takeda, C; Souza, Cláudio Lopes de

doi:10.11606/t.11.2020.tde-20200111-124427

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“…Important aspect of this study was an evaluation of changes in the performance of cycle zero hybrid compared to cycle one hybrid (CI), in other words, a comparison of CI 1 x CI 2 , whose yield mean of the three sites was 5.7% above that obtained with hybrid C0 1 x C0 2 . Considering only the result of Lavras, where the selection had been carried out, this increase was 4.4%, indicating that in spite of the expressive interaction progenies x sites in maize trial, the interaction, in this case, had a small effect on the result of selective progress (Arias 1995, Takeda 1997. Moreover, the fact that interaction of populations x sites was not significant in this study confirms this observation (Table 3).…”

Section: Resultssupporting

confidence: 67%

Alterations in heterosis of maize populations derived from single-cross hybrids after reciprocal recurrent selection

Raposo¹,

Ramalho²,

Ribeiro³

2004

CBAB

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One hundred and sixty-nine interpopulational half sib progenies were obtained from maize populations derived from the commercial single-cross hybrids AG9012 (1) and C333 (2) to investigate the efficiency of reciprocal recurrent selection (RRS). Fifteen progenies with highest hulled ear yield were obtained. Two recombination trials were sown with remnant S 1 seeds, and the improved CI 1 and CI 2 populations were simultaneously obtained with their hybrid combination. Yield trials were set up in three sites to assess the efficiency of the RRS. The F 1 from single-cross hybrid AG9012 and C333, the doublecross (F 1(1) x F 1( 2) ) hybrids, the C0 1 and C0 2 populations, the interpopulational hybrid (C0 1 x C0 2 ), the CI 1 and CI 2 improved populations, and their hybrid (CI 1 x CI 2 ) were compared. A 5.7% progress was obtained in one cycle of RRS for ear yield, mainly attributed to increased heterosis. The yield of the improved hybrid was superior to the F 1 from single-cross hybrids AG9012 and C333, demonstrating the potential of the referred hybrid combination.

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Section: Resultssupporting

confidence: 67%