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Impact of salinity on yield-related parameters in two contrasting cultivars of Oryza glaberrima Steud. in Benin

Published online by Cambridge University Press:  14 March 2023

Hermann Prodjinoto ,
Christophe Gandonou ,
Willy Irakoze  and
Stanley Lutts Open the ORCID record for Stanley Lutts [Opens in a new window]
Hermann Prodjinoto
Affiliation:
Groupe de Recherche en Physiologie végétale – Earth and Life Institute-Agronomy (ELIA) – Université catholique de Louvain, Louvain-la-Neuve, Belgium Laboratoire de Physiologie végétale et d’Etude des Stress environnementaux, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, Louvain-la-Neuve, République du Bénin
Christophe Gandonou
Affiliation:
Laboratoire de Physiologie végétale et d’Etude des Stress environnementaux, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, Louvain-la-Neuve, République du Bénin
Willy Irakoze
Affiliation:
Faculté d’Agronomie et de Bio-ingénierie, Université du Burundi, Bujumbura, Burundi
Stanley Lutts*
Affiliation:
Groupe de Recherche en Physiologie végétale – Earth and Life Institute-Agronomy (ELIA) – Université catholique de Louvain, Louvain-la-Neuve, Belgium
*
*Corresponding author. E-mail: stanley.lutts@uclouvain.be
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Summary

Salinity is one of the major environmental stresses limiting growth and yield of rice. The objective of the present study was to analyze the impact of NaCl on yield-related parameters of Oryza glaberrima. Two contrasted cultivars of Oryza glaberrima previously tested for salt resistance at the vegetative stage [salt-resistant (TOG5307) and salt-sensitive (TOG5949)] were irrigated with a saline solution containing 30 mM NaCl (EC: 3 dS.m−1 NaCl). After 6 months of treatments, mineral nutrient and yield-related parameters were assessed. Proline was quantified in the panicle leaf at the start of the grain filling stage. NaCl treatment affected most yield-related parameters: panicle length, panicle leaf dry weight, number of branches per panicle, panicle leaf length, days to 50% heading, straw fresh weight per plant, grain yield per plant, number of spikelets per panicle, and number of filled grains per panicle. The weight of 1,000 grains decreased in the salt-sensitive cultivar only, suggesting that grain filling processes were compromised. The salt-resistant cultivar TOG5307 was less affected than the salt-sensitive TOG5949 and accumulated lower amounts of Na+ in the grains. For both cultivars, hulls contained higher concentration of Na+ and K+ than grains. TOG5307 also contained more proline in the panicle leaf than TOG5949, suggesting that TOG5307 can cope with the osmotic component of salt stress. The cultivar exhibiting the highest salt resistance at the vegetative stage also exhibited the highest resistance at the reproductive one.

Keywords

African riceOryza glaberrimaSalinitySalt stressYield
Type
Research Article
Information
Experimental Agriculture , Volume 59 , 2023 , e5
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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