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        <dc:title>Drought (WS) and low phosphorus (LP) stress in groundnut: Water extraction pattern and tolerance related traits for breeding program</dc:title>
        <dc:creator>Hamidou, F</dc:creator>
        <dc:creator>Heynikoye, M</dc:creator>
        <dc:creator>Halilou, O</dc:creator>
        <dc:creator>Upadhyaya, H D</dc:creator>
        <dc:creator>Vadez, V</dc:creator>
        <dc:subject>Abiotic Stress</dc:subject>
        <dc:subject>Crop Improvement</dc:subject>
        <dc:subject>Plant Breeding</dc:subject>
        <dc:subject>Groundnut</dc:subject>
        <dc:description>Drought (WS) and low soil phosphorus (LP) are major constraints&#13;
of groundnut productivity. This study aims to (i) understand&#13;
the relative importance of phosphorus (P) deficiency, water&#13;
stress and their interaction, (ii )investigate water extraction&#13;
pattern under WS and LP, and (iii) identify field and controlled&#13;
conditions measured traits related to better performance of genotypes&#13;
under WS and LP. Six groundnut varieties were assessed&#13;
under field and lysimetre conditions. Two water regimes (WW,&#13;
WS) and 2 phosphorus treatments (HP, LP) were imposed. Leaf&#13;
Area Index (LAI), roots volume (RV), length density (RLD) and&#13;
roots dry matter (RDM), water extraction (WEx), transpiration&#13;
efficiency (TE), soil moisture content (SMC) and yield were investigated.&#13;
LP stress decreased LAI and pod weight (Pwt) (42&#13;
and 28 % respectively). ICGV 12991 and 12CS-116 varieties&#13;
showed the highest LAI and Pwt. LAI, correlated to Pwt(r2 =&#13;
0.77), revealed relevant trait for LP tolerance.LP and WS decreased&#13;
roots and canopy measured traits. WS and LP decreased&#13;
WEx (51 and 7% respectively). Combined LP and WS (WS-LP)&#13;
decreased WEx up to 60%. ICG 12991 and 12CS-116 showed the&#13;
highest WEx, RLD and RDM under WS-LP; RLDcould contribute&#13;
to water uptake to avoid dehydration. Significant genotypic&#13;
variation observed on SMC revealed different pattern of WEx.&#13;
TE increased under WS and decreased under LP; factors driving&#13;
TE would be different.12CS-116, 55-437 and ICG 12991 revealed&#13;
high TEand tolerant to WS-LP but showed different tolerance&#13;
mechanism. This study revealed that ICG 12991 and 12CS-116&#13;
were tolerant to WS-LP and LAI, RLD, while WEx and TE revealed&#13;
relevant traits for groundnut improvement.</dc:description>
        <dc:date>2017-02</dc:date>
        <dc:type>Conference or Workshop Item</dc:type>
        <dc:type>PeerReviewed</dc:type>
        <dc:format>application/pdf</dc:format>
        <dc:language>en</dc:language>
        <dc:identifier>http://oar.icrisat.org/10702/1/197.pdf</dc:identifier>
        <dc:identifier>  Hamidou, F and Heynikoye, M and Halilou, O and Upadhyaya, H D and Vadez, V  (2017) Drought (WS) and low phosphorus (LP) stress in groundnut: Water extraction pattern and tolerance related traits for breeding program.  In: InterDrought-V, February 21-25, 2017, Hyderabad, India.     </dc:identifier></oai_dc:dc>
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