Suitability of carbon isotope discrimination, ash content and single mineral concentration for the selection of drought‐tolerant winter rye

Abstract

Carbon isotope discrimination (Δ) has been proposed as selection criterion for grain yield under dry conditions, and ash content (m a ) and mineral concentration were suggested as surrogates for Δ. In this study, the relationship between grain yield, Δ, m a and mineral concentration (Si, Ca, K, Mg) was examined in 2011 and 2012 on 16 winter rye genotypes grown under severe drought, mild drought (2012 only) and well-watered conditions. Analyses were performed on mature flag leaves and grains. Highly significant differences between water regimes occurred for all measured traits. Δ, m a and mineral concentrations were significantly correlated with grain yield under severe drought in 2011, but not in 2012 except for Δ in flag leaf. Δ was related to m a and mineral concentrations. Although the correlations were quite inconsistent, the results indicate that the measured traits can potentially be used as selection criterion for drought tolerance in rye. For a final statement about the suitability of these traits in rye breeding, the results should be secured with a larger and more diverse set of genotypes.

Phenotypic and metabolic variation among spring Brassica napus genotypes during heat stress

“…Genotypic differences for CID have been reported in numerous crop species including B. napus (Matus et al 1995;Chen et al 2011;Kottmann et al 2014;Dhanapal et al 2015;Mora et al 2015). Easlon et al (2013) demonstrated a relationship between CID and water-use efficiency in Arabidopsis; however, given the absence of any relationship between yield and CID in either the control or heat-stress treatment in this study, further exploration into the relationship of CID to heat stress appears unwarranted.…”

Correlation between leaf epicuticular wax composition and structure, physio‐biochemical traits and drought resistance in glaucous and non‐glaucous near‐isogenic lines of rye

“…The δ 13 C has been proposed as a selection criterion for cereal grain yield under dry conditions, because δ 13 C is directly related to transpiration efficiency and integrates it throughout the growth period of the sample tissue. Positive correlations were found between the δ 13 C values of leaf and grain yield (Kottmann et al., 2014 ; Merah et al., 2000 ; Monneveux et al., 2004 ); however, Monneveux et al. ( 2006 ) reported the correlation only for grain δ 13 C. So far, higher δ 13 C values have been reported in glaucous plants growing in different water regimes (Febrero et al., 1998 ; Merah et al., 2000 ; Monneveux et al., 2004 ); however, there are also studies in which such relationships were not found (Adamski et al., 2013 ; Frizell‐Armitage, 2016 ).…”

Mechanisms Regulating the Dynamics of Photosynthesis Under Abiotic Stresses

“…Additionally, the impaired expression of SGR (STAY-GREEN), a chloroplast targeted protein that act as key regulator of Chl degradation and NYC1 (NON-YELLOW COLORING 1) under heat and drought stress inhibit the process of chlorophyll degradation and retention in green soybean seeds. In wheat, the relative contribution of ear (spike and awns) to grain filling is severely affected by drought stress, for instance the CO 2 assimilation is reduced due drought and eventually disturb the rate of photosynthesis (Kottmann et al, 2014 ; Merah et al, 2018 ). Ashraf and Harris ( 2013 ) reported that Chl content assimilation does not show a positive correlation with drought condition in wheat plants, suggesting that it may be due to variation in Chl synthesis among the cultivars mediated by the alteration in the activities of specific enzymes involved in the biosynthesis of Chl (Ashraf and Harris, 2013 ).…”