Crops evolving in drier areas could have drought tolerance traits. The same is true for crops evolving in acidic growing regions; they may possess acidity tolerance traits. However, in most of the cases acid soils occur in wet regions especially with good vegetation cover. Drier regions are well identified by having saline soil types. Because of these I think that finding a crop plant naturally possessing both drought and acidity tolerance traits may be a rare phenomenon. What do you think?
I will suggest you few papers of multiple stress
1. http://www.sciencedirect.com/science/book/9780080924830
2. http://journal.frontiersin.org/article/10.3389/fpls.2015.00723/full
3. http://www.sciencedirect.com/science/article/pii/S2214514113000172
4. Chapter 1 https://books.google.fi/books?id=Krn7HBiU10EC&pg=PA1&lpg=PA1&dq=multiple+stress+plant+response+acid+soil&source=bl&ots=CXUzBrUx_K&sig=Dp6gzTa55zFGoKNnfMv1jqpnKPM&hl=en&sa=X&ved=0ahUKEwjImKGNyNTLAhWi33IKHTHpDwoQ6AEILDAD#v=onepage&q=multiple%20stress%20plant%20response%20acid%20soil&f=false
I hope it will help
Low pH can move into tolerant plants Al and heavy metals. The crop list that tolerate low pH is restricted, but I think we must let cultivation to suitable places without perturbation of fragile or degraded locations. http://www.harvesttotable.com/2013/12/vegetable-crop-soil-ph-tolerances/
I concur with your suspicion that the combined incidents of drought and acidity is quite uncommon which is perhaps why they are rarely considered together as natural selection forces. However, I don't think the question is entirely academic and there are tropical type regions whereby soil could experience water deficit frequently, but due to high level of isomorphous substitution (Al for Si) of the parent material, the subsoil could be quite acidic.
While Al toxicity lowers the soil pH, any effect on plant can not be unequivocally attributed to pH. In fact there are reasons to believe that direct Al toxicity is more likely to interact with water deficit than the pH.
These are some pertinent lit. Hope they are on the right track!
Zhong-Bao Yang, Dejene Eticha, Alfonso Albacete, Idupulapati Madhusudana Rao, Thomas Roitsch and Walter Johannes Horst. (2012). Physiological and molecular analysis of the interaction between aluminium toxicity and drought stress in common bean (Phaseolus vulgaris). J. Exp. Bot. (2012)doi: 10.1093/jxb/ers038
For all of you, I thank you very much for your invaluable answers and the time you spent to support my cause.
With best regards,
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