heterosis in soybeans for seed yield components and associated traits

Clicks: 313
ID: 191701
2002
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Abstract
The objective of this research was to quantify heterosis of agronomic traits and evaluate direct and indirect correlations among seed yield and other traits. A diallel involving six parents was grown in two localities. Seed yield (PG), one-hundred seed weight (PCS), number of pods per plant (NV), weight of aerial part of the plant (PPA), harvest index (IC) and number of seeds per pod (NGV) were evaluated. Positive values of heterosis were detected for all traits. Estimates of heterosis components were significative for most traits, showing effects of aditivity and dominance. The specific heterosis was more important than the variety heterosis, mainly in the locality Anhembi. MTBR-95-123800 presented the best potential per se and as parent in crosses, but it was excelled by some of the hybrids in the two localities. Number of pods per plant demonstrated to be suitable for indirect selection for PG.
O efeito da heterose tem sido pouco estudado em soja, especialmente em germoplasma adaptado às condições do Brasil. O objetivo deste estudo foi quantificar a heterose de caracteres agronômicos e avaliar as correlações diretas e indiretas em relação à produtividade. Um dialelo envolvendo seis genitores foi conduzido em dois locais. Foram avaliados produtividade de grãos (PG), peso de cem sementes (PCS), número de vagens por planta (NV), peso da parte aérea (PPA), índice de colheita (IC) e número de grãos por vagem (NGV). Valores positivos de heterose foram detectados para todos os caracteres, especialmente PG. As estimativas dos componentes da heterose foram significativas para a maioria dos caracteres avaliados, evidenciando efeitos gênicos de aditividade e de dominância. A heterose específica foi mais importante que a heterose de variedade, principalmente no local Anhembi. MTBR-95-123800 (5) apresentou grande potencial de uso per se e em cruzamentos, sendo superado por alguns cruzamentos, nos dois locais. O caráter número de vagens por planta demonstrou ter potencial para a seleção indireta de genótipos mais produtivos.
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pandini2002brazilianheterosis Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Fábio Pandini;Natal Antonio Vello;Ângela Celis de Almeida Lopes
Journal current drug delivery
Year 2002
DOI
10.1590/S1516-89132002000600001
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600001
Keywords
path analysis breeding

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