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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
16/06/2000 |
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Data da última atualização: |
16/06/2000 |
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Autoria: |
FONSECA, C. E. L.; VIANDS, D. R.; HANSEN, J. L.; PELL, A. N. |
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Título: |
Associations among forage quality traits, vigor and disease resistance in alfalfa. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Crop Science, Madison, v.39, p.1271-1276, Sep./Oct. 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
Major objectives for alfalfa (Medicago sativa L.) breeding include improving forage quality and levels of disease resistance. Little is known about the associations between forage quality characteristics, including pectin (the main componet of neutral deterget-soluble fiber [NDSF]), and disease resistance and vigor in alfalfa. Our objectives were to determine, in two alfalfa populations, the (i) correlations among NDSF and other forage quality traits; (ii) correlations of forage quality traits with plant persistence, vigor, and levels of resistance to diseases; and (iii) heritabilities and expected gains from selection for the aforementioned traits. Simple, phenotypic, and additive genetic correlation coefficients were estimated from half-sib (HS) progeny tests of two alfalfa populations (NY9505 and NY9515). In both populations, NDSF was negatively correlated with acid detergent fiber (ADF), lignin, and neutral detergent fiber (NDF), and positively correlated with true in vitro dry matter digestibility (IVDMD). Vigor was positively correlated with ADF, lignin, and NDF, and negatively correlated with IVDMD and crude protein (CP) only in NY9515. Of 144 correlation coefficients computed between forage quality traits and resistances to five major alfalfa diseases, only six were significant, and they were low in maguitude (-0.22 = 0.11 to 0.30 = 0.14). In an alfalfa improvement program, selection for forage quality is not expected to indirectly affect levels of disease resistance, but it may reduce vigor. MenosMajor objectives for alfalfa (Medicago sativa L.) breeding include improving forage quality and levels of disease resistance. Little is known about the associations between forage quality characteristics, including pectin (the main componet of neutral deterget-soluble fiber [NDSF]), and disease resistance and vigor in alfalfa. Our objectives were to determine, in two alfalfa populations, the (i) correlations among NDSF and other forage quality traits; (ii) correlations of forage quality traits with plant persistence, vigor, and levels of resistance to diseases; and (iii) heritabilities and expected gains from selection for the aforementioned traits. Simple, phenotypic, and additive genetic correlation coefficients were estimated from half-sib (HS) progeny tests of two alfalfa populations (NY9505 and NY9515). In both populations, NDSF was negatively correlated with acid detergent fiber (ADF), lignin, and neutral detergent fiber (NDF), and positively correlated with true in vitro dry matter digestibility (IVDMD). Vigor was positively correlated with ADF, lignin, and NDF, and negatively correlated with IVDMD and crude protein (CP) only in NY9515. Of 144 correlation coefficients computed between forage quality traits and resistances to five major alfalfa diseases, only six were significant, and they were low in maguitude (-0.22 = 0.11 to 0.30 = 0.14). In an alfalfa improvement program, selection for forage quality is not expected to indirectly affect levels of disease resistance... Mostrar Tudo |
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Palavras-Chave: |
Feed crops; Quality; Resistencia a doenca. |
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Thesagro: |
Alfafa; Cerrado; Forragem; Medicago Sativa; Qualidade. |
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Thesaurus NAL: |
alfalfa; disease resistance; vigor. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02279naa a2200289 a 4500
001 1546217
005 2000-06-16
008 1999 bl --- 0-- u #d
100 1 $aFONSECA, C. E. L.
245 $aAssociations among forage quality traits, vigor and disease resistance in alfalfa.
260 $c1999
520 $aMajor objectives for alfalfa (Medicago sativa L.) breeding include improving forage quality and levels of disease resistance. Little is known about the associations between forage quality characteristics, including pectin (the main componet of neutral deterget-soluble fiber [NDSF]), and disease resistance and vigor in alfalfa. Our objectives were to determine, in two alfalfa populations, the (i) correlations among NDSF and other forage quality traits; (ii) correlations of forage quality traits with plant persistence, vigor, and levels of resistance to diseases; and (iii) heritabilities and expected gains from selection for the aforementioned traits. Simple, phenotypic, and additive genetic correlation coefficients were estimated from half-sib (HS) progeny tests of two alfalfa populations (NY9505 and NY9515). In both populations, NDSF was negatively correlated with acid detergent fiber (ADF), lignin, and neutral detergent fiber (NDF), and positively correlated with true in vitro dry matter digestibility (IVDMD). Vigor was positively correlated with ADF, lignin, and NDF, and negatively correlated with IVDMD and crude protein (CP) only in NY9515. Of 144 correlation coefficients computed between forage quality traits and resistances to five major alfalfa diseases, only six were significant, and they were low in maguitude (-0.22 = 0.11 to 0.30 = 0.14). In an alfalfa improvement program, selection for forage quality is not expected to indirectly affect levels of disease resistance, but it may reduce vigor.
650 $aalfalfa
650 $adisease resistance
650 $avigor
650 $aAlfafa
650 $aCerrado
650 $aForragem
650 $aMedicago Sativa
650 $aQualidade
653 $aFeed crops
653 $aQuality
653 $aResistencia a doenca
700 1 $aVIANDS, D. R.
700 1 $aHANSEN, J. L.
700 1 $aPELL, A. N.
773 $tCrop Science, Madison$gv.39, p.1271-1276, Sep./Oct. 1999.
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