Effects of high temperature during anthesis and grain filling on physiological characteristics of winter wheat cultivars

Abstract

Due to climate change, multiple heat events are expected to be an additional limiting factor that will adversely affect wheat production. The study aimed to analyze the physiological response to heat stress in four winter wheat cultivars at different physiological stages under greenhouse conditions during 2019. The net photosynthetic rate, stomatal conductance, chlorophyll index, maximum quantum efficiency of photosystem II, fructose, glucose and sucrose content, grain yield per plant, grain weight and number of grains per plant were analyzed in wheat cultivars under short periods of heat stress at anthesis and mid‐grain filling, and combined stress at anthesis and mid‐grain filling. The results of the study indicated that heat stress modified the photosynthesis‐related and grain yield–related traits. Moreover, heat stress caused a decrease of sucrose content, while fructose and glucose content increased. Heat stress had more pronounced effects on the photosynthetic parameters and grain yield during grain filling than during anthesis. A significant variation observed among cultivar responses to the negative impact of heat stress highlighted the fact that cultivars Pobeda and Gladius were more tolerant than Renesansa and Simonida. Different cultivar reactions to heat stress during anthesis and grain filling indicated the need to conduct further studies with wheat cultivars of different origin in order to identify additional sources of tolerance.

Elevated CO2 Improves the Physiology but Not the Final Yield in Spring Wheat Genotypes Subjected to Heat and Drought Stress During Anthesis

“…Besides, it has been proposed that sink strength (grain capacity) can be the limiting factor in starch accumulation and grain filling in favorable environments ( El Habti et al, 2020 ). In addition, the varied responses among winter wheat cultivars were depending on their tolerance in response to heat stress at anthesis and mid-grain filling stages to maintain photosynthetic activity and grain yield ( Mirosavljević et al, 2021 ). Altogether, we could conclude that, under control conditions, the eCO 2 differently affected both genotypes.…”

The Effects of Brief Heat During Early Booting on Reproductive, Developmental, and Chlorophyll Physiological Performance in Common Wheat (Triticum aestivum L.)

“…As indicators of senescence, chlorophyll soil plant analysis development (SPAD) (chlorophyll content index) ( Richardson et al, 2002 ) and Fv/Fm (the maximum potential quantum yield of photosystem II) ( Murchie and Lawson, 2013 ) have been widely used to evaluate this trait. Under terminal heat, SPAD and Fv/Fm were often reduced in leaf tissue during senescence and were closely related to yield-contributing traits, such as thousand grain weight ( Talukder et al, 2014 ; Hassan et al, 2018 ; Mirosavljević et al, 2021 ; Touzy et al, 2022 ). Studies for the genetic analysis of these leaf senescence related traits are also available ( Azam et al, 2015 ; Bhusal et al, 2018 ; Touzy et al, 2022 ).…”

The effects of brief heat during early booting on reproductive, developmental and physiological performance in common wheat (Triticum aestivum L.)

“…As indicators of senescence, chlorophyll SPAD (chlorophyll content index) (Richardson et al 2002) and Fv/Fm (the maximum potential quantum yield of photosystem II) (Murchie and Lawson 2013) have been widely used to evaluate this trait. Under terminal heat, SPAD and Fv/Fm were often reduced in leaf tissue during senescence and closely related to yield contributing traits, such as thousand grain weight (Talukder et al 2014; Hassan et al 2018; Mirosavljević et al 2021; Touzy et al 2022). Studies for the genetic analysis of these leaf senescence related traits are also available (Azam et al 2015; Bhusal et al 2018; Touzy et al 2022).…”