33 research outputs found
Morphological variability in some synthetic hexaploid wheats derived from Triticum turgidum x T. tauschii
Agronomic variability in selected Triticum turgidum X T. tauschii synthetic hexaploid wheats
IPB - IRRI varietal improvement for dryland legume crops for rice based cropping systems : 1985 technical report
1BL.1RS translocation in some Indian bread wheat genotypes and strategies for its use in future wheat breeding
Heat stress adaptation in elite lines derived from synthetic hexaploid wheat
The contribution of synthetic hexaploids in spring wheat (Triticum aestivum L.) breeding has been documented under drought stress, but not previously under heat stress. A set of six advanced wheat lines derived from synthetic hexaploid wheat (ASD) was compared to their conventional hexaploid (ConvâHex) and synthetic derivative (SynâDer) parents under three different temperature scenarios in the field (temperate or nonâstress, heatâstress environment, and lateâ or extreme heat environment). The ASD lines showed a yield advantage under heat and extreme heat stress compared to the best parent (SynâDer) by on average 15 and 13%, respectively, while the average yield advantage under temperate conditions was just 5%. A similar pattern to yield was observed for grain number, while individual kernel weight of ASD lines was similar to the best parent (SynâDer) in all three environments. The ASD lines expressed on average 12% more final biomass than the best parent (SynâDer) under heat environment, but similar biomass to them at temperate and extreme heat environments, respectively. Physiological traits related to heat tolerance included higher crop growth rate, increased waterâsoluble carbohydrates (WSC) storage in stems, cooler canopy temperature, and spectral indices which are related to pigment composition, photoâprotective mechanisms, and radiation use efficiency. These traits enabled a larger number of grains to be set, in addition to growth of taller stems with a greater WSC storage capacity that was significantly related to kernel weight. Results reinforce the positive impact of using synthetic wheat in plant breeding for climate change.C. Mariano Cossani and Matthew P. Reynold