Daylength and temperature are not acted upon. But, the Q10 effect of higher temperature enlarges every gene activity, and more delaying daylength and greater sensitivity to photoperiod enlarge any photoperiod gene activity. Two subsets of gene action jointly control traits a to i. The essential subset is virtually all the genes. Their integrated activities implement growth and an autonomous capability to develop to all stages.
Any photoperiod genes inhibit and delay that autonomous development as described above.
Highest yield arises through optimal system functioning, genetic instruction that best uses the available environmental resources but simultaneously counters environmental stresses. Selection for highest possible level of any of traits a to i unbalances system functioning and lowers yield. Here is the summary we made of a discussion between Dr Bucchini and myself about Bt toxins action, human toxicity, and allergies. As these proteins are receptor-specific, they would not wound human gut cells because these cells do not posses such specific receptors. And the stomach of mammals is at pH 2.