20. Inbreeding depression analysis in F2 segregating population of bread wheat
Main Article Content
Abstract
The present experiment was conducted to analysis mean performance and inbreeding depression in six F2 hybrids. The F2 populations of wheat along with their parents differed significantly (P≤0.01) for all yield and its components, suggesting that abundant genetic diversity is available in these genotypes. For mean performance, among the parents, the variety TD-1 demonstrated better performance for early maturity, plant height, tillers plant-1, spikelets spike-1, grains spike-1, seed index and grain yield plant-1; however, among the F2 progenies, the F2 progeny TD-1 x Imdad exhibited better performance for various traits such as days to 50% heading, plant height, grains spike-1, seed index and grain yield plant-1, indicating that these genetic resources can further be utilized in various breeding programs to improve bread wheat. With regards to inbreeding depression, the F2 progeny TJ-83 x Moomal expressed low amount of inbreeding depression for various traits including spike length (-9.88%), spikelets spike-1 (-0.82%), seed index (-5.98%), grain yield plant-1 (-3.62%) while same F2 progeny also showed maximum (-3.72%) inbreeding depression for the trait days to 50% heading, and indeed is desirable for that trait. Consequently, the F2 progeny TJ-83 x Moomal would be useful F2 hybrid to be utilized for commercial cultivation since this progeny showed minimum inbreeding depression for variety of traits.
Keywords: Bread wheat; F2 segregating population; Inbreeding depression; Grain Yield