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Low phosphorus and water stress tolerance in Pearl millet under lysimetre conditions

  1. Hamidou Falalou, Beggi Francesca, Hassane Abdou, Boulama K Taya, Vincent Vadez Low phosphorus and water stress tolerance in Pearl millet under lysimetre conditions Final BMZ Abiotic stress project workshop, Niamey, 23-25 March 2014 Hamidou Falalou, Beggi Francesca, Hassane Abdou, Boulama K Taya, Vincent Vadez Low phosphorus and water stress tolerance in Pearl millet under lysimetre conditions Final BMZ Abiotic stress project workshop, Niamey, 23-25 March 2014 Hamidou Falalou, Beggi Francesca, Hassane Abdou, Boulama K Taya, Vincent Vadez Low phosphorus and water stress tolerance in Pearl millet under lysimetre conditions
  2. Characterization of contrasting pearl millet varieties for component traits of low P (LP) and water stress (WS) tolerance Objective Methodologies  2010: - pots trial (102 varieties), selection of contrasting materials - establishment of phenotyping facilities - lysimetre trial, 15 contrasting varieties  2011-2013: lysimetre trials (18 Var.) for: - LP, WS and LP xWS effects - LP and WS tolerance traits
  3. Design: RCBD Treatment: * Phosphorus - LP = soil (brayP1 <5) + 2,5g urea - HP = soil (brayP1 <5)+ 6g DAP * Water - WW = well watered - WS = water stress Beads and plastic for evaporation avoidance
  4. Constraints: - Storm and Rain OutShelter (ROS) use for WS application - TSP availability - P increase in HP lysimetres A B CD
  5. WW WS Lysimetre system, beads application High P Low P High P Low PLow P High P Low P Beads  18 Var, 5 rep, LP, HP, WW and WS  Measurements WW WS Low P High P Low P WW WS High P Low P beads
  6. RESULTS 0 10 20 30 40 50 60 70 80 90 100 heading (begin) heading (50%) flow (begin) flow (50%) Daysaftersowing LP HP Low P effect on 15 contrasting varieties Delay in heading and flowering times due to LP
  7. LP HP 0 10 20 30 40 50 60 70 80 head wght seeds wght shoot wght stem wght Weight(g) HP LP Decrease of seeds weight and biomass Top Var: PE06001, PE00397, CZ Boboni, Sosat and ICMVIS 94206 Down Var: Sadore-Local, PE02724, PE03012 and GB8735-M-C1 Significant genotypic variation: seeds wght: HP: 24 - 54g, LP: 1 – 29g
  8. 5 8 11 14 17 20 23 26 29 32 Anko Doga F4x Fal G Bx ICM ICRIP2604P3089P5572P5638P5663P5665P8030 SeCA SeCK Stri Tera Grainyield(g) Grain Yield HP Grain Yield LP Grain Yield LP-ws Characterization of 18 contrasting varieties under LP, HP, WW and WS conditions Obj: LP, WS, LPxWS effects and tolerance traits Significant genotypic variation contrasting materials LPxWS interaction
  9. - Low P delayed flowering time in pearl millet - No significant WS effect LP and WS effect on agro-physiological traits  Flowering time 48 50 52 54 56 58 60 62 HP-WW HP-WS LP-WW LP-WS Floweringtime(days)
  10. - Transpiration decreases under LP and WS - LP effect higher than WS effect 0 1 2 3 4 5 6 7 8 9 Trp-HP-ww Trp-HP-ws Trp-LP-ww Trp-LP-ws Totaltranspiration(kg) Transpiration
  11. Different pattern of water use in the 18 Var. under LP, HP, WW and WS conditions 0 2 4 6 8 10 12 Anko Doga F4x FalC2 GBx ICM ICRI P2604 P3089 P5572 P5638 P5663 P5665 P8030 SeCA SeCK Stri Tera Transpiration(g) Trp-HP-ww Trp-HP-ws Trp-LP-ww Trp-LP-ws - PE2604 and PE8030: stability - PE5638 and PE5665 : variability 0 2 4 6 8 10 12 Anko Doga F4x FalC2 GBx ICM ICRI P2604 P3089 P5572 P5638 P5663 P5665 P8030 SeCA SeCK Stri Tera Transpiration(g) Trp-HP-ww Trp-HP-ws Trp-LP-ww Trp-LP-ws
  12. 0 5 10 15 20 25 30 HP-WW HP-WS LP-WW LP-WS Grainyield(g) Grains Yield Grains yield decrease (%) LP under WW 23 LP under WS 35 WS under HP 10 WS under LP 23 LP + WS 41 What Traits?
  13.  Negative close relationship between grain yield and delay in flowering under LP y = -1.3952x + 24.18 R2 = 0.594 5 15 25 35 0 1 2 3 4 5 6 7 8 Flowering delay (day) GrainyieldLP(g)
  14. Close negative relationship between grain yield and heading delay under low P y = -0.604x + 15.422 R2 = 0.7822 -4 -2 0 2 4 6 8 10 12 5 10 15 20 25 30 grain yield under low P headingdelay(days) Short delay under LP is adaptative mechanism to LP stress.
  15. Flo- delay SPAD WU (g) HI Grains (g) Doga-C2 1 44.14 9245 0.2 25.8 PE02604 2 42.22 9111 0.21 22.18 ICMVIS94206 2 48.28 9291 0.18 19.28 Ankoutess 3 49.68 9277 0.16 19 Striga res_l_noir 6 48.18 8838 0.13 10 Sarkin C2 ali 5 47.64 9843 0.08 8 PE5665 7 40.40 8462 0.09 11 Component traits for LP and WS tolerance in contrasting materials Tolerance to LP and WS should be combination of strategies: - Water extraction - maintaining physiological activities - phenology
  16. Lessons learned  Build solid ROS  Manage P application  Weighing tubes for water use measurement until flowering time Perspectives: Investigations on LP-WS tolerant traits must be pursued
  17. THANK YOU MERCI BEAUCOUP
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