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        <dc:title>Step-wise selection for early canopy traits followed by stress tolerance indices as an approach for improving&#13;
drought tolerance in groundnut (Arachis hypogaea L.)</dc:title>
        <dc:creator>Ankush, W</dc:creator>
        <dc:creator>Ashutosh, P</dc:creator>
        <dc:creator>Janila, P</dc:creator>
        <dc:subject>Groundnut</dc:subject>
        <dc:description>Rationale:&#13;
Drought stress at the pod filling stage of groundnut is a major yield constraint in the semi-arid tropics of Africa and&#13;
Asia.&#13;
Methods:&#13;
A population of 600 MAGIC lines (MLs) (F8/9generation) is studied in Leasyscan, a high throughput phenotyping&#13;
platform (HTPP) that assessed canopy growth up to 45 days after planting (DAP), and under managed stress&#13;
environment that uses drip lines for application of uniform and measured quantity of water in well-watered (WW)&#13;
and water-stress (WS) plots. Intermittent drought was imposed from 60 DAP coinciding with pod-filling stage, and&#13;
time domain reflectometry (TDR) probes measured soil moisture.&#13;
Results:&#13;
During 2018-19, the Mean Score Index (MSI) of Productivity and Resilience indices selected 20 MLs (MSI=9-10)&#13;
at par with the checks, ICGV 02266 (MSI=9.4) and ICGV 03043 (MSI=9.2). About 50% of the MLs (320) recorded a&#13;
Leaf Area Index (LAI) of &lt;0.30 from which 12 MLs recorded high MSI. From 122 MLs that recorded superior digital&#13;
biomass (11173 to 11297 m3) at 45 DAP than the drought tolerant check ICGV 02266 (10245 m3), eight MLs recorded&#13;
high MSI. Extreme water stress of 100 mm imposed at pod filling stage in 2021-22 resulted in a yield reduction of&#13;
&gt;70% in 402 MLs, however, 29 MLs with &lt;20% yield reduction were selected.&#13;
Conclusions &amp; Perspectives:&#13;
Early generation selection using HTPP (LeasyScan) for early canopy traits followed by stress index-based selections&#13;
in managed stress environment is proposed for drought tolerance breeding in groundnut. The MAGIC population is&#13;
a valuable source for improving drought tolerance.</dc:description>
        <dc:date>2022-12-02</dc:date>
        <dc:type>Conference or Workshop Item</dc:type>
        <dc:type>PeerReviewed</dc:type>
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        <dc:language>en</dc:language>
        <dc:identifier>http://oar.icrisat.org/12044/1/7151_with%20cover.pdf</dc:identifier>
        <dc:identifier>  Ankush, W and Ashutosh, P and Janila, P  (2022) Step-wise selection for early canopy traits followed by stress tolerance indices as an approach for improving drought tolerance in groundnut (Arachis hypogaea L.).  In: The 7th Congress on Plant Production In Water - Limited Environment, 28 Nov - 02 Dec 2022, King Fahd Hotel, Dakar, Senegal.     </dc:identifier></oai_dc:dc>
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