Ear: Stem ratio in old and modern wheat varieties; relationship with improvement in number of grains per ear and yield

The parameters of grain filling and yield components in common wheat (Triticum aestivum L.) and durum wheat (Triticum turgidum L. var. durum)

“…Compensatory effects among yield components were found to be common and are well documented [e. g. 19], especially under warmer weather conditions [20]. The only positive correlation noted for yield (Y) was with NS (Table 6), which is in accordance with research performed by [21] and [22], who found that yield differences among durum wheat genotypes mainly depended on different number of grains per unit area. Similar results are reported for common wheat [23].…”

“…The number of grains was determined in relatively early phases of plant development [24] and the after anthesis yield depended on grain weight [16]. In our study, similar to the results obtained by [4], earlier genotypes had larger grains and longer grain filling duration (Table 6).…”

Monitoring the dynamics of wheat stem elongation: genotypes differ at critical stages

“…Previous studies investigating wheat growth during SE had a measurement frequency similar to the present study (Siddique et al 1989; Flink et al 1995) or even higher in the case of Kirby (1988) who measurement daily. The number of observed genotypes in those studies was however significantly lower compared to the present study.…”

“…Kirby (1988) and Flink et al (1995) used one variety each, the former in a greenhouse experiment, the latter in a field trial. Siddique et al (1989) used a total of 26 varieties in three field experiments. In these studies, plant height or length of single stem organs was measured by hand.…”

Field Measurements of Canopy Spectra for Biomass Assessment of Small-Grain Cereals

“…The product of these traits provides a framework for expressing the grain yield in physiological terms and for contextualizing past yield gains in small-grain cereals, particularly wheat and barley. Retrospective studies conducted with wheat frequently associate increases in yield with increases in partitioning of biomass to the grain, with small or negligible increases (Austin et al, 1980(Austin et al, , 1989Royo et al, 2007;Sayre et al, 1997;Siddique et al;Waddington et al, 1986), or even significant decreases (Álvaro et al, 2008a) in total biomass production. Increases in biomass have been reported in spring wheat (Reynolds et al, 1999;, winter bread wheat (Shearman et al, 2005), and durum wheat (Pfeiffer et al, 2000;Wadington et al, 1987).…”