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Potassium deficiency impedes elevated carbon dioxide-induced biomass enhancement in well watered or drought-stressed bread wheat

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Asif, Muhammad and Yılmaz, Özlem and Öztürk, Levent (2017) Potassium deficiency impedes elevated carbon dioxide-induced biomass enhancement in well watered or drought-stressed bread wheat. Journal of Plant Nutrition and Soil Science, 180 (4). pp. 474-481. ISSN 1436-8730 (Print) 1522-2624 (Online)

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Official URL: http://dx.doi.org/10.1002/jpln.201600616

Abstract

Potassium (K) deficiency reduces photosynthesis and biomass production of crop plants and also renders them vulnerable to drought stress, whereas elevated carbon dioxide (CO2) 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 CO2 and drought conditions. Increased biomass production caused by elevated CO2 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 CO2 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 CO2 and drought stress. Potassium deficiency clearly impeded the impact of elevated CO2 in both well-watered as well as drought-stressed plants. Adequate K fertilization is a prerequisite for efficient harvesting of atmospheric CO2 through increased photosynthesis, decreased transpiration, and increased biomass production under changing atmospheric CO2 and soil moisture conditions.

Item Type:Article
Uncontrolled Keywords:carbohydrates; chlorophyll; photosynthesis; stomatal conductance; Triticum aestivum
Subjects:S Agriculture > S Agriculture (General) > S589.7 Agricultural ecology (General)
S Agriculture > SB Plant culture > SB183-317 Field crops
Q Science > QK Botany > QK710-899 Plant physiology
ID Code:41294
Deposited By:Levent Öztürk
Deposited On:02 Feb 2021 14:22
Last Modified:02 Feb 2021 14:22

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