There are also tree species, that exhibit moderate resistance to salinity and, therefore can be used for plantation on saline soils. There include the following : Prosopisspiciera, Buter monosperma, Terminalia bellerica, etc. Efforts are also underway to understand the molecular basis of salt tolerance and to isolate genes responsible for this attribute, so that salt tolerant plants can be developed through the use of genetic engineering.
In vitro selection for tolerance to aluminium toxicity has also been successful in tomato, soybean, rice, barley, and wheat. Regenerants of selected lines can be used for growing plants in acidic soils with aluminium toxicity. Man made synthetic crop 'triticale' has also been found suitable for growing it (i) on acid soils in countries like Poland. Kenya, Ethiopia, India, Ecuador, Brazil, Mexico, etc.; (ii) on dry and sandy soils (e.g. Savanna region of Brazil and some marginal lands in Asia); (iii) on alkaline and calcareous soils (e.g. in Mexico, Spain, Portugal, USA) and (iv) on mineral (e.g. Cu, Mn, Zn) deficient and high boron soils (e.g. Australia).
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