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Potassium deficiency impedes elevated carbon dioxide‐induced biomass enhancement in well watered or drought‐stressed bread wheat
Author(s) -
Asif Muhammad,
Yilmaz Ozlem,
Ozturk Levent
Publication year - 2017
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.201600616
Subject(s) - photosynthesis , carbon dioxide , transpiration , biomass (ecology) , agronomy , potassium , chemistry , water use efficiency , potassium deficiency , water content , biology , organic chemistry , biochemistry , geotechnical engineering , engineering
Potassium (K) deficiency reduces photosynthesis and biomass production of crop plants and also renders them vulnerable to drought stress, whereas elevated carbon dioxide (CO 2 ) has a positive effect on photosynthesis and yield and ameliorates the adverse effects of drought stress. This study aimed to characterize the physiological responses of wheat ( Triticum aestivum L.) stressed with K deficiency under elevated CO 2 and drought conditions. Increased biomass production caused by elevated CO 2 as a consequence of increased photosynthesis and water use efficiency was absent in young K‐deficient wheat plants. Shoot K concentration was negatively affected by elevated CO 2 particularly under K‐deficient conditions, whereas K content per plant was greatest in plants supplied with adequate K and adequate water. Specific leaf weight was increased as a consequence of carbohydrate accumulation in the source leaves of K‐deficient plants particularly under elevated CO 2 and drought stress. Potassium deficiency clearly impeded the impact of elevated CO 2 in both well watered as well as drought‐stressed plants. Adequate K fertilization is a prerequisite for efficient harvesting of atmospheric CO 2 through increased photosynthesis, decreased transpiration, and increased biomass production under changing atmospheric CO 2 and soil moisture conditions.