Accumulation and remobilization of assimilates in different genotypes of durum wheat under terminal drought stress

Genotypic capacity of post-anthesis stem reserve mobilization in wheat for yield sustainability under drought and heat stress in the subtropical region

“…The study showed that the traits SRM and SRE exhibited wider variations among genotypes under all environments, with higher variations under water-deficit stress conditions. This variability could be attributed to differences in stem-soluble carbohydrate concentrations among the genotypes ( Ehdaie et al, 2006 ; Ruuska et al, 2006 ; Liu et al, 2020 ; Vosoghi Rad et al, 2022 ). Soluble carbohydrates in the stem have been found to mobilize into the grain during the grain-filling period, and stem biomass after anthesis is directly related to the total water-soluble carbohydrate in the stem under water-deficit conditions ( Saint Pierre et al, 2010 ).…”

Environment-oriented selection criteria to overcome controversies in breeding for drought resistance in wheat

“…Peduncle dry matter translocation to the spike, and its efficiency, under DS conditions, might not be related to PL, but to its specific weight (given by the ratio between peduncle weight and length). Furthermore, the lower internodes seem to provide the most significant contribution in terms of dry matter remobilization to the spike (Vosoghi Rad et al 2022). While Vosoghi Rad et al ( 2022) reported a positive correlation between peduncle specific weight and yield in drought conditions, Villegas et al (2007) found the opposite relationship.…”

“…The peduncle is the last internode of the main stem, located immediately below the initial tip of the spike. The importance of the peduncle in supporting the GF process, via remobilization of pre-stored assimilates, especially in contexts of DS in which the contribution of late photosynthesis to GF is reduced, is well known (Yang and Zang, 2006;Vosoghi Rad et al, 2022). Some authors have suggested that the peduncle could also play an active non-negligible role in late photosynthesis by having anatomical and physiological advantages over the flag leaf, e.g., higher stomatal density (Kong et al, 2010).…”

“…Authors observing the highest PL reduction, and the highest positive correlation between PL and GY in drought conditions, impose water shortage quite early in the life cycle (Bogale et al, 2011;Soares et al, 2020;Ahmad et al, 2020). When water shortage appears later, no significant correlation emerges between PL and GY (Villegas et al, 2007;Pour-Aboughadareh et al, 2020a;Vosoghi Rad et al, 2022), and significant PL reduction due to DS is not always observed, as the peduncle reaches its maximum length within 5 -10 days after anthesis (Vosoghi Rad et al, 2022). No significant correlation between PL and tolerance indexes emerges comparing neither rainfed nor irrigated wheat in Iran (Kamrani et al 2015).…”

“…They identified a positive correlation between peduncle weight and drought susceptibility index (DSI), suggesting that a lighter peduncle could be an indicator of drought resistance, insofar as a heavier peduncle would be characterized by a higher proportion of structural carbohydrates over water-soluble ones that can be translocated to the spike. A further complexity is given by the fact that PL reduction is also an effect of Rht genes (Rebetzke et al, 2011), and in general PL gives the highest contribution to PH (Vosoghi Rad et al, 2022), whose complicated relationship with yield in arid and semi-arid contexts has been treated above.…”