Abstract
Fe is a trace element considered to be essential for rice, and it drives several metabolic processes. Fe toxicity occurs due to excessive Fe ions (Fe2+) and which, disturb cellular homeostasis and dramatically reduces the rice yield. A set of 118 BRILs made from a cross of japonica cv.’02428’ and indica ‘Changhui 891’ was used with high density bin map constructed by using high quality SNP to identify the QTL for Fe toxicity tolerance. As a whole total of 23 QTL were identified for various seedling traits, 3 under control with phenotypic difference ranging from 14.21% to 62.46%, 11 QTL under stress with phenotypic difference ranging from 7.89% to 47.39% and 9 under stressed/control ratio with phenotypic variance ranging from 9.17% to 183.50%. LOD values of QTL ranging from 4.05 to 17.04 in control, 3.41 to 8.09 in stress and 2.84 to131.63 in stress/control ratio. Shoot length (SL), root length (RL), shoot fresh weight (SFW), root fresh weight (RFW), shoot dry weight (SDW), and root dry weight (RDW), were used to estimate the degree of Fe tolerance. Many stable QTL, qSSDW-4, qSSDW-6, qRSDW-4 and qRSDW-6 affecting SDW were detected and beside this some new QTL, qRSFW-1, qRRFW-10 and qRRDW-1 were successfully identified significantly contributing to Fe toxicity tolerance in rice. The results of current study indicated that these novel regions could be transferred via markers assisted section and QTL pyramiding to develop Fe resistant lines in rice.
Highlights
Rice (Oryza sativa L.) is the most important and staple food crop of the world, in Southeast Asia and China (Mishra and Panda, 2017; Vivitha et al, 2017) and it provides about 40 % of the daily calories to world’s population (Parengam et al, 2010)
Population development A BRILs population consists of 118 lines and its parents were used to estimate the degree of Fe toxicity tolerance at seedling traits and to identify the putative QTL linked with Fe toxicity tolerance
Mean values of Shoot length (SL), shoot fresh weight (SFW) and shoot dry weight (SDW) under control conditions were considerably decreased as compared to stress indicated that these are least affected by the Fe toxicity under hydroponic conditions
Summary
Rice (Oryza sativa L.) is the most important and staple food crop of the world, in Southeast Asia and China (Mishra and Panda, 2017; Vivitha et al, 2017) and it provides about 40 % of the daily calories to world’s population (Parengam et al, 2010). Fe has atomic number 26 that’s why it is called heavy metal (Tchounwou et al, 2012). Many heavy metals such as cobalt, nickel, copper and Fe. Fe which is a trace element, essential to humans, plants and animals, but it is toxic to many plants at higher concentration (He et al, 2005; White and Brown, 2010). One of the serious constraint to production of lowland rice grown in acid flooded soil is Fe toxicity (De Dorlodot et al, 2005). Rice production in Southeast Asia, Brazil and Africa is severely affected by Fe toxicity (Audebert and Fofana, 2009)
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