Abstract
The introduction of gibberellin-responsive reduced height (GAR Rht) alleles is a promising tool for breeding semi-dwarf, high-input varieties of wheat. We have compared recombinant isogenic lines F2:3 carrying dwarfing allele Rht13 and without dwarfing alleles, obtained from the cross of isogenic lines and selected from F2 using molecular markers. After phenotyping and statistical analysis, we found that the Rht13 allele reduces total plant height by 13.0 cm (17.4%), while the proportions between the internodes in tall and short plants remain similar. The greatest decrease in length in plants with Rht13 in comparison to wild-type plants is observed for the second internode (5.3 cm, or 31.9%). Due to the presence of Rht13, semi-dwarf plants, compared to the wild type, had a higher grain number per main spike, grain number per spikelet and higher number of productive tillers, and a slightly higher harvest index, although thousand grain weight and grain weight in the main spike were lower. Our results indicate the possibility of using Rht13 in the breeding of wheat varieties without dramatic negative effects on yield and plant development.
Highlights
Wheat is one of the most important crops in the world
Besides different effect on the plant height, they vary by the effect on other agronomically important traits such as harvest index (HI), biomass production (BM), grain yield (GY), Agronomy 2020, 10, 927; doi:10.3390/agronomy10070927
We found that the significant differences in plant height became noted at 50% heading
Summary
Wheat is one of the most important crops in the world. Federation ranks third in the world in wheat production after China and India. A large increase in wheat yield during the Green revolution was achieved in part because of breeding new dwarf varieties that are more resistant to lodging. This was made possible due to the discovery of reduced height (Rht) genes. Besides different effect on the plant height, they vary by the effect on other agronomically important traits such as harvest index (HI), biomass production (BM), grain yield (GY), Agronomy 2020, 10, 927; doi:10.3390/agronomy10070927 www.mdpi.com/journal/agronomy
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