Relationships between carbon isotope discrimination and leaf morphophysiological traits in spring-planted spring wheat under drought and salinity stress in Northern China

Abstract

The relationships between carbon isotope discrimination (Δ) and some morphophysiological traits such as specific leaf dry weight (SLDW), gas exchange parameters, and relative water content (RWC) were studied in a collection of 20 bread wheat cultivars (landraces, released cultivars and advanced lines) in three locations of the Ningxia region (North-East China), i.e. Yinchuan (limited irrigation conditions), Huinong (limited irrigation conditions + salinity) and Guyuan (rain-fed conditions). Relationships between Δ, grain yield (GY), and harvest index (HI) and above-ground biomass (AGB) were also analysed. Differences in the measured traits between different locations were highly related to the variation in water availability. Positive correlations were noted between Δ and HI and grain yield. Flag leaf Δ was positively correlated with RWC at anthesis, and negatively associated with SLDW at grain filling. Significant and negative correlations between Δ and dry matter weight per plant at anthesis and biomass at maturity were noted. Leaf temperature (LT) was found to be negatively correlated with Δ and gs. The findings suggest that Δ may be a useful indicator reflecting wheat yield, harvest index, and water status under irrigation and rain-fed conditions in the Ningxia region.

Relationship between Carbon Isotope Discrimination, Mineral Content and Gas Exchange Parameters in Vegetative Organs of Wheat Grown under Three Different Water Regimes

“…2009), and negative associations between grain Δ and grain m a were found in cereals (Merah et al. 1999, 2001b, Merah 2001, Zhu et al. 2008b).…”

“…Transpiration efficiency (TE), the ratio of dry matter produced to water transpired, is an important component of drought tolerance and water use efficiency. However, the measurement Zhu et al 2008b). In addition, wide genetic variation and high heritability of D were found in several C 3 species (Farquhar and Richards 1984, Condon and Richards 1992, Masle et al 1992, Ehdaie and Waines 1993, Brown and Byrd 1996.…”

Relationship of Carbon Isotope Discrimination with Biomass and Water Use Efficiency for Alfalfa in Northwestern China

“…In fact, the soil water content under T 3 in 2013 was approximately equal to that under T 2 in 2012, imposing mild water deficit on the genotypes. According to previous literature (Farquhar et al, 1989;Morgan et al, 1993;Araus et al, 1998;Xu et al, 2007), water stress leads to a decrease in G s , which decreases C i / C a and thus D. Positive correlations between D and water status parameters have been repeatedly reported in wheat (Fischer, 1998;Merah et al, 2001b;Monneveux et al, 2005;Zhu et al, 2008b) and alfalfa (Pozo et al, 2017), underlining the interest in the use of D as an indicator of water availability and as an environmental index under irrigated or rainfed conditions. Relationship among aboveground biomass (AGB), water use efficiency (WUE), carbon isotope discrimination of aboveground stems (D AGS ) and leaf water-soluble carbohydrates (D WSC ), evapotranspiration (ET), and photosynthetic parameters (stomatal conductance [G s ], net photosynthetic rate [P n ], ratio of internal leaf CO 2 concentration to ambient CO 2 concentration [C i /C a ], and P n /G s ) and stem/leaf ratio (R S/L ).…”

“…In postanthesis stress scenarios, the relationship between D and grain yield is significantly positive and stable across environments in cereals (Ansari et al, 1998;Araus et al, 1998;Voltas et al, 1999;Xu et al, 2007;Zhu et al, 2010). Under rainfed conditions, the relationship between D and yield varies highly depending on rainfall amount and distribution, and the quantity of water stored in the soil at sowing for wheat (Triticum aestivum L.) (Xu et al, 2007;Zhu et al, 2008b). Under rainfed conditions, the relationship between D and yield varies highly depending on rainfall amount and distribution, and the quantity of water stored in the soil at sowing for wheat (Triticum aestivum L.) (Xu et al, 2007;Zhu et al, 2008b).…”

Screening Wheat Genotypes for Drought Tolerance and Co-relation Study among Morpho-physiological Traits

“…The mean biomass produced by the wheat genotypes in moisture stressed environment was significantly lower than that in the non stressed environment. Reduction in biomass due to moisture stress had been reported by Zhu et al (2008 …”