HERITABILITY FOR RESISTANCE TO ROSETTE DISEASE IN EXOTIC VALENCIA GROUNDNUTS
Groundnut rosette disease (GRD) is the most destructive virus disease of Valencia groundnuts ( Arachis hypogaea L.) in sub-Saharan Africa. Cultural, biological and chemical control measures have received limited success due to small scale farmers' inability to use them. Use of host plant resist...
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Veröffentlicht in: | African crop science journal 2016-06, Vol.24 (2), p.203 |
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Zusammenfassung: | Groundnut rosette disease (GRD) is the most destructive virus disease
of Valencia groundnuts ( Arachis hypogaea L.) in sub-Saharan Africa.
Cultural, biological and chemical control measures have received
limited success due to small scale farmers' inability to use
them. Use of host plant resistance provides the most effective and
economically viable management option for the resource poor farmers.
This study was conducted to determine heritability for resistance to
GRD in Valencia groundnuts. Six crosses; Valencia C (P1) × ICGV-SM
90704 (P2), Valencia C (P1) × ICGV-SM 96801(P2), Valencia C (P1)
× ICGV-SM 99566 (P2), NuMex-M3 (P1) × ICGV-SM 90704 (P2),
NuMex-M3 × ICGV-SM 96801 (P2), and NuMex-M3 (P1) × ICGV-SM
99566 (P2), were made to generate F1, F2, BC1P1 and BC1P2 populations.
Data on GRD severity were collected on a 1-9 score scale. Genetic
Advance as a percentage of the mean (GAM) and heritability were
estimated using variance components. Phenotypic Coefficient of
Variation (PCV) and Genotypic Coefficient of Variation (GCV) estimates
were high (20.04-70.1%) in the six crosses, except for Valencia C
× ICGV-SM 96801(18.1%) and NuMex-M3 × ICGV-SM 96801(17.1%),
which exhibited moderate GCV values. Broad and narrow sense
heritability estimates for GRD disease score ranged from 64.1 to 73.7%
and 31 to 41.9%, respectively, in all the crosses. GAM was high in all
the crosses (21-50.7%), except for Valencia C x ICGV-SM 96801 (14.67),
M3 x ICGV-SM 99566 (18%) and NuMex-M3 x ICGV-SM 96801 (13.5%) crosses
that exhibited moderate GAM. The study revealed the presence of
variability of GRD resistance, implying that genetic improvement of
these exotic materials is possible.
La maladie de rosette chez l'arachide ( Arachis hypogaea L.)
est la plus destructive des maladies virales chez les
variétés Valencia en Afrique au sud du Sahara. Les moyens de
lutte culturale, biologique et chimique présentent des limitations
surtout liées à l'inhabilité des petits
producteurs à les mettre en pratique. L'utilisation de
variétés resistantes représente le moyen le plus
efficace et économiquement viable pour les petits producteurs. La
présente étude a été conduite afin de
déterminer l'héritabilité de la résistance
à la maladie de rosette chez les variétés
d'arachide Valencia. Six croisements; Valencia C (P1) ×
ICGV-SM 90704 (P2), Valencia C (P1) × ICGV-SM 96801(P2), Valencia
C (P1) × ICGV-SM 99566 (P2), NuMex-M3 (P1) × ICGV-SM 90704
(P2), NuMex-M3 × ICGV-SM 96801 (P2), et NuMex-M3 (P1 |
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ISSN: | 1021-9730 2072-6589 |
DOI: | 10.4314/acsj.v24i2.8 |