Genotypic Variation for Root Development, Water Extraction and Yield Components in Groundnut Under Low Phosphorus and Drought Stresses

Falalou, H and Mariama, H and Achirou, F B and Oumarou, H and Vadez, V (2018) Genotypic Variation for Root Development, Water Extraction and Yield Components in Groundnut Under Low Phosphorus and Drought Stresses. American Journal of Agriculture and Forestry, 6 (5). pp. 122-131. ISSN 2330-8591

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Abstract

[Context] Unpredictable water deficit (drought) and low soil phosphorus (LP) are major interacting constraints to groundnut growth and grain yield in Sahelian zones of West Africa. Combining breeding efforts for drought tolerance and P efficiency could lead to improve tolerance and grains yield in these zones. [Objectives] This study assessed six groundnut genotypes under lysimetric system to better understand the relative importance of P deficiency, water stress, and their interaction; investigate the water extraction pattern of genotypes under these constraints and identify tolerance related traits to accelerate development of more resilient varieties. [Methods] Thus, in experiment 1 (Exp.1) roots traits were investigated at 50% flowering, pod filling stage (60 days after sowing) and maturity stage (90 days after sowing) under high phosphorus (HP) and LP treatments. In experiment 2 (Exp.2), two water regimes (WW=well water, and WS = water stress) were imposed to HP and LP plants and parameters like total transpired water (TTW), transpiration efficiency (TE), water extraction (Wex), pods and haulm weights were investigated. [Results] Roots traits showed significant decrease due to LP stress, pod and haulm weights correlated significantly to roots length density (RLD) and roots dry matter (RDM). Genotypes 12CS-116 and ICGV 12991 revealed tolerant to LP stress while RLD and RDM revealed LP tolerance related traits in groundnut. Interacting effect of LP and drought stress (LPWS) was higher than separate effect of LP and WS. Under LPWS, Wex, TTW, TE, pod and haulm yields decreased significantly. This study suggests that RLD and RDM contributed to Wex in 12CS-116 and ICG 12991 under LPWS. 55-437 and JL-24 with highest TTW showed drought tolerance strategy while drought avoidance strategy could explain 12CS-116, 12CS-79, ICG 12991 and ICGV 97183 response to WS. Pod weight showed tight correlation (R2 =0.7) to TE only under LPWS suggesting that TE explains a large part of pod yield variation under LPWS conditions. TE revealed WS and LPWS tolerance related trait. The genotypic variation observed on Wex and TTW under LPWS suggests different patterns of water extraction and use among the groundnut genotypes.

Item Type: Article
Divisions: Research Program : Innovation Systems for the Drylands (ISD)
Research Program : West & Central Africa
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Water Extraction, Roots Traits, Drought, Low Phosphorus, Stress, Groundnut, Yield
Subjects: Others > Abiotic Stress
Others > Drought Tolerance
Mandate crops > Groundnut
Others > Genetics and Genomics
Others > Plant Physiology
Depositing User: Mr Ramesh K
Date Deposited: 17 Sep 2018 03:49
Last Modified: 17 Sep 2018 03:49
URI: http://oar.icrisat.org/id/eprint/10855
Official URL: http://www.sciencepublishinggroup.com/journal/pape...
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: The work was supported by CRP Grains Legumes. Authors are grateful Dr Zaman-Allah Mainassara Abdou (Senior Scientist, Crop physiologist, CIMMYT, Zimbabwe) for his comments and inputs on the first draft of this manuscript.
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