Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

Abstract

NERICA is a new African rice variety, developed by the West African Rice Development Association (WARDA) in 1990s. NERICA rice shows both vigorous growth and tolerance of stressors such as drought and disease. The purpose of this study was to clarify the physiological and biochemical responses to salt stress of NERICA rice seedlings. The degree of growth inhibition caused by salt stress was small in NERICA rice varieties as compared with japonica Nipponbare. Na accumulation in leaf blades was high in salt-sensitive varieties. Accumulation of proline, a known compatible solute, was also induced by salt stress, especially in salt-sensitive varieties; it was thought that this accumulation was brought on salt-stress injury. The contents of polyamines, especially spermidine, were high in the pre-stressed leaf blades of NERICA rice seedlings. After the salt-stress treatment, the polyamine content of leaf blades differed with the degree of salt tolerance of the NERICA rice seedlings. These results suggested that the salt tolerance of NERICA rice seedlings might be associated not only with the regulation of Na absorption and translocation but also with their ability to maintain leaf polyamine levels under salt-stress conditions.  

Comparative whole genome re-sequencing analysis in upland New Rice for Africa: insights into the breeding history and respective genome compositions

“…This observation is consistent with the concept that salt tolerance in NU4 is derived from WAB56–104 as reported previously (Awala et al 2010 ). Interestingly, Yamamoto et al ( 2011 ) reported the similar physiological response of NU3 and NU4 to salt stress compared to other five NU varieties, while NU3 and NU4exhibited different profiles of total amino acids and polyamine. At the same time, Yamamoto et al ( 2011 ) reported salt stress susceptibility of NU2 among the NU varieties.…”

“…Interestingly, Yamamoto et al ( 2011 ) reported the similar physiological response of NU3 and NU4 to salt stress compared to other five NU varieties, while NU3 and NU4exhibited different profiles of total amino acids and polyamine. At the same time, Yamamoto et al ( 2011 ) reported salt stress susceptibility of NU2 among the NU varieties. Those differences of NU varieties in salt stress response imply that multiple genetic components for salt stress adaptation are combined differently in their genomes.…”

“…In the NU varieties, divergence was observed in quantitative agronomic traits and apparent phenotypes (Ikeda et al 2009 ; Sanni et al 2009 ; Fukuta et al 2012 ; Saito et al 2012 ; Rodenburg et al 2015 ). Studies over the past years have also accumulated data that captures the physiological behavior of the NUs and their divergence in a biotic stress responses (Yamamoto et al 2011 ; Atayese et al, 2016 ; Sikuku et al 2012 ; Sakariyawo et al 2015 ). In most cases the genetic reasons for divergence in traits are not known.…”

A rice really interesting new gene H2‐type E3 ligase, OsSIRH2‐14, enhances salinity tolerance via ubiquitin/26S proteasome‐mediated degradation of salt‐related proteins

“…Under salinity stress, an ion imbalance, such as the accumulation of Na + , directly reduces carbon fixation and biomass production in plants. Additionally, K + can counteract Na + stress; thus, the potential of plants to tolerate salinity is dependent on their K + nutrition (Cha‐Um, Supaibulwattana, & Kirdmanee, ; Chen et al, ; Fakhrfeshani, Shahriari‐Ahmadi, Niazi, Moshtaghi, & Zare‐Mehrjerdi, ; Hoang et al, ; Yamamoto, Sawada, Shim, Usui, & Fujihara, ). For this reason, membrane integrity, Na + and K + concentrations, and the ratio between Na + and K + are key parameters that differentiate sensitive and tolerant rice cultivars during salinity stress (Hoang et al, ).…”

Impact of Coating of Urea with Bacillus-Augmented Zinc Oxide on Wheat Grown under Salinity Stress

“…The application of ZnSO 4 and BAZ-coated urea remarkably lowered the activity of antioxidant enzymes, particularly under salinity stress. The accumulation of harmful Na might have replaced essential nutrients with functions, e.g., the replacement of K and Ca with Na altered stomatal opening and closing, and caused membrane disruption [ 46 , 47 ]. Zinc sulfate and BAZ-coated urea provided relief and lowered the antioxidant enzyme activity, which may be associated with enhancement of the nutrient uptake at the cost of Na accumulation in the plant [ 25 ].…”