To breed rice for drought tolerance, is it feasible to start selection in the F2 by picking out offspring harbouring certain molecular markers, given that it is expected that these QTLs will continue segregating in the subsequent generations? Or is it better to keep selfing a hybrid population until the F5 or F6 and then start selection?
The F2 population may be suitable for studying the QTLs responsible for drought tolerance within your materials. Do the parents you used for crossing carry any KNOWN QTLs conferring drought tolerance with flanking markers?
* If the answer is NO, you have to start from the beginning to find the QTLs.
* If the answer is YES, how far is the distance from the flanking markers to the QTLs?
Yes, it's feasible, most especially if the donor parents have been repeatedly back crossed to the recipient/recurrent parents and then advance to F2. Impact it's the most right generation to selection of the markers to be used are effectively working.
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