Salt and drought tolerant crop cultivars produced/developed through screening, selection, breeding, mutation breeding, tissue culture, molecular breeding or through transgenic approaches are very few. A number of reports are available in the literature using different strategies but most of them are not tested in field conditions or for commercial purposes. A number of reviews focused on why a limited success in this regard. I am interested in collecting data about name of crop cultivars that has been developed so far. Please give the name of salt/drought tolerant cultivar with reference or weblink. For example,
Name of crop Cultivar Salt tolerant method used Reference
Wheat S-24 Salt tolerant Breeding & selection Ashraf, 2009
Hello Habib,
You start by saying that there is little good evidence of `drought resistance' achieved by any methods in crops. There is evidence but mostly anecdotal or lacking back-ground information to show how the effects were achieved. To really understand the problem requires a more critical analysis than has been done. I suggest that the reasons need considering - see
Lawlor DW (2013) Genetic engineering to improve plant performance under drought: physiological evaluation of achievements, limitations, and possibilities J. Exp. Bot. (2013) 64 (1): 83-108. doi: 10.1093/jxb/ers326 First published online: November 16, 2012
The methods of assessing the responses of all plants, including crops whether conventionally selected, bred, or GM should be applied and then what is responsible for differences might become apparent.
I reached the conclusion for GM plants that the claims of ¬drought resistance' were not warranted.
A later paper
Nuccio ML Wu J, Mowers R, Zhu H-P, Meghiji M, Primaversi LP, Paul MJ, Chen X, Gao Y, Haque E, Bau SS, Lagrimini LM (2015) Expression of trehalose-6-phosphate phosphatase in maize ears improves yield in well-watered and drought conditions Nature Biotechnology 33, 862–869 DOI:doi:10.10Nuccio38/nbt.3277
suggests that yield increase in maize (corn) was achieved (about 10% - larger values should be treated with caution) by altering carbohydrate metabolism in the eras. A more detailed analysis of the material would be useful.
Regards
David
Cultivars with salinity tolerance are usually poor in yield, like in rice, pokalli is typical example of salt tolerant cultivar. As mentioned they are poor in yield, mostly it is not cultivated and hence the term "cultivar-cultivated variety" does not hold for them. Also such varieties have a major use in plant breeding.
P.S: As i am working in rice, i knew abt rice only...
Look for H+PPase for salinity tolerance, it is major breakthrough in biotechnology.
Hi David W. Lawlor,
Could you comment on this--
You mentioned "I reached the conclusion for GM plants that the claims of 'drought resistance' were not warranted."
However, Monsanto company did create a drought-tolerant hybrid corn and commercialize it. The GM drought-tolerant corn--DroughtGard™ hybrid corn:
http://www.monsanto.com/products/pages/droughtgard-hybrids.aspx
From its website:
"The trait in DroughtGard™ Hybrids is the world’s first and only drought-tolerant biotechnology trait for corn. It is designed to help corn plants resist drought stress and minimize the risk of failure in drought conditions. DroughtGardTM Hybrids are part of a systems approach that combine best agronomic recommendations, germplasm and a drought-tolerant biotech trait. They are designed to help the plant adapt to drought stress, use available soil moisture efficiently and provide the opportunity to help minimize yield loss from drought."
The whole story of this DroughtGard Hybrid corn, see attached document.
we are working on improving salinity tolerance of crop plants using various strategies in my view, there is no salt -tolerant crop available on the market right now..
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