Inheritance of drought resistance related traits in two crosses of groundnut (<Emphasis Type="Italic">Arachis hypogaea</Emphasis> L.) |
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Authors: | H D Upadhyaya Shivali Sharma Sube Singh Murari Singh |
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Institution: | (1) International Crops Research Institute for the Semi Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502324, AP, India;(2) Department of Mathematics and Statistics, Concordia University, 1455 De Maisonneuve Blvd West, Montreal, QC, H3G 2J5, Canada |
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Abstract: | Groundnut (Arachis hypogaea L.) is an important oilseed crop grown in more than 100 countries across wide range of environments. Frequent occurrence
of drought is one of the limiting factors adversely affecting groundnut productivity, especially in rainfed areas, and hence
genotypes having high water use efficiency (WUE) under limited available water need to be developed. In groundnut, WUE is
correlated with SPAD chlorophyll meter reading (SCMR) and specific leaf area (SLA). These two traits, SCMR and SLA, can be
used as surrogate traits for selecting for WUE. In order to improve SCMR and SLA, and in turn WUE in groundnut, a good knowledge
of the genetic system controlling the expressions of these traits is essential for the selection of the most appropriate and
efficient breeding procedure. The present investigation was conducted to determine the gene action controlling the inheritance
of SCMR and SLA in two crosses, ICG 7243 × ICG 9418 and ICG 6766 × Chico, and their reciprocals. Six generations of each cross
(P1, P2, F1, F2, BC1P1, and BC1P2) were evaluated for SCMR and SLA at two stages of the crop growth viz., 60 and 80 days after sowing (DAS). For SCMR at 80
DAS, additive effects were important in both the crosses whereas predominance of dominance effects with duplicate epistasis
was observed for SCMR at 60 DAS and SLA at both stages in both the crosses. Predominance of additive effect for SCMR at 80
DAS suggested effective selection could be practiced even in early generations whereas for SCMR at 60 DAS and SLA at both
stages in both crosses, it would be better to defer selection to later generations. Further, recording of SCMR and SLA should
be done between 60 and 80 DAS for screening the germplasm lines for drought tolerance. |
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