Plant Cell Reports

, Volume 34, Issue 2, pp 199–210 | Cite as

DREB1A overexpression in transgenic chickpea alters key traits influencing plant water budget across water regimes

  • Krithika Anbazhagan
  • Pooja Bhatnagar-Mathur
  • Vincent Vadez
  • Srinivas Reddy Dumbala
  • P. B. Kavi Kishor
  • Kiran K. Sharma
Original Paper

Abstract

Key message

We demonstrate the role of DREB1A transcription factor in better root and shoot partitioning and higher transpiration efficiency in transgenic chickpea under drought stress

Abstract

Chickpea (Cicer arietinum L.) is mostly exposed to terminal drought stress which adversely influences its yield. Development of cultivars for suitable drought environments can offer sustainable solutions. We genetically engineered a desi-type chickpea variety to ectopically overexpress AtDREB1A, a transcription factor known to be involved in abiotic stress response, driven by the stress-inducible Atrd29A promoter. From several transgenic events of chickpea developed by Agrobacterium-mediated genetic transformation, four single copy events (RD2, RD7, RD9 and RD10) were characterized for DREB1A gene overexpression and evaluated under water stress in a biosafety greenhouse at T6 generation. Under progressive water stress, all transgenic events showed increased DREB1A gene expression before 50 % of soil moisture was lost (50 % FTSW or fraction of transpirable soil water), with a faster DREB1A transcript accumulation in RD2 at 85 % FTSW. Compared to the untransformed control, RD2 reduced its transpiration in drier soil and higher vapor pressure deficit (VPD) range (2.0–3.4 kPa). The assessment of terminal water stress response using lysimetric system that closely mimics the soil conditions in the field, showed that transgenic events RD7 and RD10 had increased biomass partitioning into shoot, denser rooting in deeper layers of soil profile and higher transpiration efficiency than the untransformed control. Also, RD9 with deeper roots and RD10 with higher root diameter showed that the transgenic events had altered rooting pattern compared to the untransformed control. These results indicate the implicit influence of rd29A::DREB1A on mechanisms underlying water uptake, stomatal response, transpiration efficiency and rooting architecture in water-stressed plants.

Keywords

Chickpea DREB1A Drought Root length density Transpiration efficiency Vapor pressure deficit 

Abbreviations

DAS

Days after sowing

DREB1A

Dehydration-responsive element binding factor 1A

FTSW

Fraction of transpirable soil water

NTR

Normalized transpiration ratio

nptII

Neomycin phosphotransferase II

RLD

Root length density

TE

Transpiration efficiency

VPD

Vapor pressure deficit

WW

Well-watered

WS

Water-stressed

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Krithika Anbazhagan
    • 1
    • 2
  • Pooja Bhatnagar-Mathur
    • 1
  • Vincent Vadez
    • 1
  • Srinivas Reddy Dumbala
    • 1
  • P. B. Kavi Kishor
    • 2
  • Kiran K. Sharma
    • 1
  1. 1.International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)PatancheruIndia
  2. 2.Department of GeneticsOsmania UniversityHyderabadIndia

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