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Drought (WS) and low phosphorus (LP) stress in groundnut: Water extraction pattern and tolerance related traits for breeding program

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