Análise do coeficiente de caminhamento (path coefficient) e estimativas de parâmetros genéticos em clones de seringueira (&gt;i&lt;Hevea&gt;/i&lt; spp)

Vasconcellos, Maria Elizabeth da Costa

doi:10.11606/d.11.1982.tde-20220208-003202

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“…The environmental correlation of AY with other characters were not significant (Table 7). These observations were not in accordance with the results of Vasconcellos (1982) or Gottardi et al (1995) who reported low association between AY and NR. Narayanan et al (1974) and Gonçalves et al (1984), however, reported strong positive correlation between AY and BT.…”

Section: Correlationscontrasting

confidence: 80%

Relationships between yield and some structural traits of the laticiferous system in Hevea clones resistant to South American leaf blight

García¹,

Guen²,

Mattos³

et al. 2002

CBAB

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Latex yield and six anatomical bark traits were measured in a five-year-old rubber tree clonal trial planted in Ituberá (Bahia, Brazil), on forty-nine different clones. The clones were pre-selected for resistance to SALB (South American Leaf Blight) caused by the fungus Microcyclus ulei (P.Henn.) v. Arx. The studied traits were : average yield (AY), girth (SC), virgen bark thickness (BT), total number of latex vessel rings (NR), average density of latex vessel per ring (DV), average diameter of latex vessels (DL) and average distance between consecutive latex vessel rings (AD). Phenotypic, genotypic and environmental correlations, and coefficient of genetic prediction (CGP) were calculated for all characters. There were considerable genetic variations between clones for AY, NR and BT, as indicated by high values of CGP. The genetic correlations were significant between AY and NR. The possibility to use NR as predictor of AY is discussed and the expected gains in percent of several references for AY are computed.

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Section: Correlationscontrasting

confidence: 80%