TY - JOUR
T1 - Evaluation of physiological markers for assessing drought tolerance and yield potential in bread wheat
AU - Yasir, Tauqeer Ahmad
AU - Wasaya, Allah
AU - Hussain, Mubshar
AU - Ijaz, Muhammad
AU - Farooq, Muhammad
AU - Farooq, Omer
AU - Nawaz, Ahmad
AU - Hu, Yin Gang
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Carbon isotope discrimination (Δ) has been recognized as a valuable phenotyping tool in wheat breeding. However, technical expertise and analysis cost restrict its large-scale use. We examined the associations of ash content (AC), minerals content (Ca, K, Mg, Fe and Mn) and leaf chlorophyll content (Chl) with grain Δ and grain yield (GY) to assess their potential as substitute to grain Δ. We evaluated 49 wheat genotypes under two water deficit regimes (W120 and W200) in a rain-out shelter. Leaf chlorophyll content (Chl) was strongly correlated with grain Δ and GY under moderate water deficit regime (W200). Significant and negative correlations (P < 0.01) of AC and potassium concentration (K) with grain Δ, and between AC and GY was observed under both water regimes, while manganese concentration (Mn) was negatively correlated with grain Δ under W120 regime only and magnesium concentration (Mg) correlated negatively under the W200 regime only. Grain Δ was correlated (P < 0.01) positively with photosynthesis rate (A), stomatal conductance (gs) and GY, while correlated negatively (P < 0.01) with intrinsic water use efficiency (iWUE) under both water regimes. Results confirm the role of grain Δ as an indirect selection criterion for drought tolerance under a wide range of drought conditions. Additionally, Chl is the most suitable trait to predict yield under moderate water deficit conditions. AC and K concentration in grain proved potentially useful and economical alternative criterion to grain Δ in the evaluation of differences in yield potential and drought tolerance in wheat under drought.
AB - Carbon isotope discrimination (Δ) has been recognized as a valuable phenotyping tool in wheat breeding. However, technical expertise and analysis cost restrict its large-scale use. We examined the associations of ash content (AC), minerals content (Ca, K, Mg, Fe and Mn) and leaf chlorophyll content (Chl) with grain Δ and grain yield (GY) to assess their potential as substitute to grain Δ. We evaluated 49 wheat genotypes under two water deficit regimes (W120 and W200) in a rain-out shelter. Leaf chlorophyll content (Chl) was strongly correlated with grain Δ and GY under moderate water deficit regime (W200). Significant and negative correlations (P < 0.01) of AC and potassium concentration (K) with grain Δ, and between AC and GY was observed under both water regimes, while manganese concentration (Mn) was negatively correlated with grain Δ under W120 regime only and magnesium concentration (Mg) correlated negatively under the W200 regime only. Grain Δ was correlated (P < 0.01) positively with photosynthesis rate (A), stomatal conductance (gs) and GY, while correlated negatively (P < 0.01) with intrinsic water use efficiency (iWUE) under both water regimes. Results confirm the role of grain Δ as an indirect selection criterion for drought tolerance under a wide range of drought conditions. Additionally, Chl is the most suitable trait to predict yield under moderate water deficit conditions. AC and K concentration in grain proved potentially useful and economical alternative criterion to grain Δ in the evaluation of differences in yield potential and drought tolerance in wheat under drought.
KW - Ash content
KW - Carbon isotope discrimination
KW - Leaf chlorophyll content
KW - Mineral content
KW - Photosynthesis
KW - Physiological
UR - http://www.scopus.com/inward/record.url?scp=85070228475&partnerID=8YFLogxK
U2 - 10.1007/s12298-019-00694-0
DO - 10.1007/s12298-019-00694-0
M3 - Article
C2 - 31564779
AN - SCOPUS:85070228475
SN - 0971-5894
VL - 25
SP - 1163
EP - 1174
JO - Physiology and Molecular Biology of Plants
JF - Physiology and Molecular Biology of Plants
IS - 5
ER -