IV.Heat stress in Triticum: kinetics of Fe and Mn accumulation

Abstract

The interactions between Fe/Mn accumulation and the photosynthetic light reactions were investigated in heat stressed bread and durum wheat genotypes (Triticum aestivum L. and Triticum turgidum subsp.durum). Four genotypes were chosen according to its genetic background diversity. Plants were grown in a greenhouse at two different day/night temperatures regimes (control -25/14ºC and heat stress -31/20ºC), during the grain filling phase. The contents and uptake/translocation of Fe and Mn were evaluated on booting, grain filling and maturity and correlated with chlorophyll a fluorescence parameters. It was found that, under heat stress, the concentrations of Fe in the culm and leaves diminished in bread wheat, but increased in durum wheat. An opposite trend was found on the contents of Fe in the spike, being this effect higher in Sever. During grain filling, the concentrations of Mn in the heat stressed plants raised significantly in the shoot for all genotypes (excepting Golia). After anthesis, the proportion of Mn translocated also augmented with high temperatures. At maturity, the same trend was found in the translocated proportion of Fe. During grain filling, all the studied fluorescence parameters did not vary significantly except q P and q E that decreased in the heat stressed Golia and F V and F v /F m that increases in Acalou. It was concluded that under heat stress, during the grain filling period, Fe and Mn translocation to the shoots accelerates, eventually to overcome the negative effects on several photosynthetic physiological traits.

Arthropod Assemblage Related to Volatile Cues in Flowering Wheat: Interaction Between Aphid Herbivory and Soil Conditions as Induction Factors

“…Interestingly, this overlap in soil factors associated with soil fertility (CEC, K, Mg, and pH), wheatÕs yield (K and pH), and arthropod assembly variations (Mg, K, CEC, and pH) contrast with Þndings by Lenardis et al (2007), showing that variation of micronutrients (Mn, Na, and Fe) rather than macronutrients in the soil of source pots had a strong relationship with differences in arthropod assemblies in the sink pots, but were unrelated to the cropÕs yield or biomass. The discrepancy with this previous work may be caused by nutrient unbalances, which can produce changes in physiological response of plants and consequently other nutrients can be more important for controlling arthropod assemblies (Dias et al 2009, Sarfraz et al 2009). Other possibility is differences in yield variation range of the experiments.…”

Mineral Composition of Organically Grown Wheat Genotypes: Contribution to Daily Minerals Intake

“…Correlation between the chlorophyll and Fe concentration was reported by Dias et al [37]. They found that higher chlorophyll content at final grain filling increased the amount of Fe in the grain [37]. Carbon dioxide enrichment was found to inhibit the assimilation of nitrate to organic nitrogen compounds.…”

“…Different wheat genotypes vary in photosynthesis and chlorophyll concentration [36]. Correlation between the chlorophyll and Fe concentration was reported by Dias et al [37]. They found that higher chlorophyll content at final grain filling increased the amount of Fe in the grain [37].…”

Cerium Oxide Nanoparticles Affect Heavy Metals Uptake by Pea in a Divergent Way than Their Ionic and Bulk Counterparts

“…Their mutual interactions are widely recognized indeed (Chatzistathis 2014). According to Kabata-Pendias (2011) and Dias et al (2009) the Fe/Mn concentration ratio should be in the range 1.5 to 2.5. In this work, the largest alterations were observed for plants treated with Ce-i (16.6 and 7.0 for roots and shoots, respectively), while values lower than 3.0 were for determined for other treatments (Table S3).…”