Tolerance of rice germplasm to iron toxicity stress and the relationship between tolerance, Fe²⁺, P and K content in the leaves and roots

Genetic Improvement of Iron Toxicity Tolerance in Rice-Progress, Challenges and Prospects in West Africa

“…Audebert and Fofana (2009) reported that for every increase in LBS by one grain, the yield is reduced by 500 kg ha -1 . There are a few other reports of a negative correlation between bronzing score and yield under Fe toxicity stress (Sahrawat et al, 1996;Nozoe et al, 2008;Onaga et al, 2013). The relation between LBS and grain yield could depend on the type and number of entries used, and experimental conditions.…”

“…Onaga et al (2013) slightly improved this protocol by adding not only nitrogen, phosphorus and potassium but also micronutrients in the Yoshida solution. They found varietal variation in traits measured in pots and a positive correlation between traits measured in pots in a rain-out shelter and the field.…”

“…A typical symptom of Fe toxicity is the copper color of leaves, called 'bronzing' which has been often used as an indicator of the stress level of Fe toxicity (Bode et al, 1995). However, in some cases, growth reduction and significant yield reduction can be observed in rice plants exposed to excess Fe without leaf bronzing (Li et al, 2001;Sahrawat, 2005;Sikirou, 2009;Onaga et al, 2013).…”

“…The concentration of Fe in the soil solution ranges from 10 to 2000 mg L -1 depending on the site and the variety used (Diatta et al, 1998;Becker and Asch, 2005). However, in fields, the critical concentration of Fe in the soil solution varies with, the location and the variety used, which indicates that other factors influence the occurrence of Fe toxicity (Audebert, 2006;Onaga et al, 2013). In rice plants, Fe toxicity can occur directly or indirectly.…”

Soil-based screening for iron toxicity tolerance in rice using pots

“…However, in some cases, growth reduction and significant yield reduction can be observed without significant leaf bronzing (Hua. Xiaoe, & Ancheng, 2001;Onaga, Edema, & Asea, 2012;Sahrawat, 2004;Sikirou, 2009). Fe toxicity also causes delay in phenological development Chérif et al, 2009;Dufey et al, 2009).…”