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
Highlights
Y (P≤0.01) for all yield and its components, suggesting that abundant genetic diversity is available in these genotypes
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
The current study was done to mark out the extent of inbreeding depression in bread wheat and identify superior crosses which would profitably be utilized in future wheat improvement programs
Summary
Days to 50% heading Early maturity is a key character in crop plants, since early maturing genotypes need a lesser amount of resources and empties the field in advance for other crops to be sown timely. The highest inbreeding depression was observed in the crosses TJ-83 x Imdad (10.21%) and TJ-83 x Moomal (-8.42%) (Table-3) indicating that these two F2 progenies could rather be exploited in further breeding programs as these F2 population showing desirable results. The maximum number of tillers plant-1 (Table-2) was produced by the genotype TD-1 (7.66), followed by TJ-83 (5.88), while among the F2 hybrids, Imdad x Moomal (7.67) resulted in maximum number of tillers plant-1, signifying that these plant materials including parents and F2 progenies could be proved backup materials in upcoming breeding programs because these plant resources possess better yield related trait in shape of maximum tillers plant-1 as compared to other parents and crosses. Similar results have been reported by Singh [9] and Singh [10] who found inbreeding depression for yield components in wheat including the number of tillers plant-1
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