Genetic and physiological bases for variation in water use efficiency in canola

Abstract

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Multi-environment QTL analysis delineates a major locus associated with homoeologous exchanges for water-use efficiency and seed yield in allopolyploidBrassica napus

“…Farquhar and Richards (1984) proposed Δ 13 C as a time-integrated surrogate trait for measuring TE both at the single leaf level and at the whole plant level, as C 3 plants discriminate less against 13 C during photosynthesis with increased water deficit stress. The negative relationship between WUE and Δ 13 C has been verified in A. thaliana (Masle et al, 2005) and in some agricultural crop plants (Farquhar et al, 1982; Ehleringer, 1993; Hall et al, 1994; Rebetzke et al, 2008; Des Marais et al, 2014; Raman et al, 2019), with some exceptions where nil or weak associations were observed (Hammer et al, 1997; Monneveux et al, 2007; Devi et al, 2011; Raman et al, 2020b).…”

“…Previous studies revealed that canola lines display a range of variation in Δ 13 C (18.7 to 23.7‰). Triazine tolerant (TT) accessions show higher Δ 13 C values compared to conventional open-pollinated varieties and hybrids (Matus et al, 1995; Pater et al, 2017; Hossain et al, 2020; Raman et al, 2020b). In this study, we utilised non-TT accessions for genetic analysis.…”

“…S2). Details of trait measurements are given in our recent study (Raman et al, 2020b) and summarised in Table S2. A brief description of the traits measured is given below.…”

“…Canola, being the second most important oilseed crop grown worldwide with a global production of 75 million tons (FAO STAT, http://www.fao.org/), is often cultivated in arid and semi-arid regions and faces periodic drought. Despite its economic significance to the oilseed industry as well as being an essential rotational crop in agricultural production systems, little research has been conducted on traits contributing to its drought tolerance (McVetty et al, 1989; Knight et al, 1994; Matus et al, 1995; Fletcher et al, 2015; Fletcher et al, 2016; Pater et al, 2017; Hossain et al, 2020; Raman et al, 2020a; Raman et al, 2020b). More recently, it was shown that two canola inbred lines, BC1329 and BC9102 vary by ∼ 2% o in their Δ 13 C signatures (Hossain et al, 2020).…”

The genetic basis of water‐use efficiency and yield in lettuce

“…The genetic control of water-use traits has been investigated in wheat, rice, maize, barley, tobacco, Arabidopsis, grape, soybean, sorghum, canola and cotton, with some progress made in elucidating the physiological relationship between yield and water limitation and identification of quantitative trait loci (QTL) for WUE traits [21][22][23][24][25]. Cultivars with enhanced production in water-limited environments have also been identified [26][27][28], but progress overall has been slow in deploying new fit-for-purpose varieties.…”