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NaCl and Na2SO4 Salinities Have Different Impact on Photosynthesis and Yield-Related Parameters in Rice (Oryza sativa L.)

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Groupe de Recherche en Physiologie végétale, Earth and Life Institute–Agronomy (ELIA) Université catholique de Louvain, 5 (bte 7.07.13) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium
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Faculté d’Agronomie et de Bio-ingénierie, Université du Burundi, Bujumbura 2940, Burundi
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Geneva Centre for Security Policy (GCSP), 1211 Geneva, Switzerland
*
Authors to whom correspondence should be addressed.
Agronomy 2020, 10(6), 864; https://doi.org/10.3390/agronomy10060864
Received: 11 May 2020 / Revised: 6 June 2020 / Accepted: 16 June 2020 / Published: 18 June 2020
(This article belongs to the Section Soil and Plant Nutrition)
To elucidate the comparative effect of chloride and sulfate salinities on photosynthesis and yield components in rice, plants of Oryza sativa (cv. I Kong Pao (salt-sensitive)) were exposed in nutrient solutions to 20 mM Na2SO4 or 40 mM NaCl (electrical conductivity of c.a. 4.30 dS m−1 for both solutions) from seedlings to maturity stage. Both types of salt induced a strong decrease in net photosynthesis (AN) at the seedling and tillering stages, while the intercellular CO2 concentrations (Ci) remained unaffected. Instantaneous transpiration (E) and stomatal conductance (gs) decreased at the tillering and seedling stages, respectively, only in plants exposed to NaCl. Chloride salinity also strongly decreased photosynthetic pigments, while no impact was detected in response to Na2SO4. All yield-related parameters were affected by salinities, but NaCl was significantly more deleterious than Na2SO4 for the mean number of tillers produced per plant, spikelets sterility and non-viable pollen percentage. In contrast, both types of salinity similarly impacted the percentage of fertile tillers and 1000-grain weight. At the grain level, more than 90% of toxic ions (Na+, excess of Cl and S6+) accumulated in the hulls, thus preserving the internal part of the caryopses from toxic ion injuries. View Full-Text
Keywords: chloride; sulfate; salinity; Oryza sativa; photosynthesis; yield chloride; sulfate; salinity; Oryza sativa; photosynthesis; yield
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MDPI and ACS Style

Irakoze, W.; Prodjinoto, H.; Nijimbere, S.; Rufyikiri, G.; Lutts, S. NaCl and Na2SO4 Salinities Have Different Impact on Photosynthesis and Yield-Related Parameters in Rice (Oryza sativa L.). Agronomy 2020, 10, 864. https://doi.org/10.3390/agronomy10060864

AMA Style

Irakoze W, Prodjinoto H, Nijimbere S, Rufyikiri G, Lutts S. NaCl and Na2SO4 Salinities Have Different Impact on Photosynthesis and Yield-Related Parameters in Rice (Oryza sativa L.). Agronomy. 2020; 10(6):864. https://doi.org/10.3390/agronomy10060864

Chicago/Turabian Style

Irakoze, Willy; Prodjinoto, Hermann; Nijimbere, Séverin; Rufyikiri, Gervais; Lutts, Stanley. 2020. "NaCl and Na2SO4 Salinities Have Different Impact on Photosynthesis and Yield-Related Parameters in Rice (Oryza sativa L.)" Agronomy 10, no. 6: 864. https://doi.org/10.3390/agronomy10060864

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