Elemental toxicities – adaptive traits governing waterlogging tolerance in wheat (Triticum aestivum) under sodic soils
2020
KULSHRESHTHA, NEERAJ | KUMAR, ASHWANI | PRASAD, K R K | SINGH, MONIKA | KUMAR, RAJESH | BASAK, NIRMALENDU | YADUVANSHI, N P S | SHARMA, P C | SHARMA, S K
unknown. Wheat (Triticum aestivum L.) is one of the most intolerant crops to soil waterlogging, so to evaluate the response of 10 wheat varieties to waterlogging stress under sodic soils, a pot experiment was conducted during 2011-12, 2012-13 and 2014-15 at ICAR-CSSRI, Karnal. Critically important physiological data on increase in element concentrations of Fe, Mn, Al and B in shoots indicated key mechanisms of tolerance under waterlogging condition in sodic soils. Concentrations of Fe, Mn, Al and B in wheat genotypes were greater under waterlogging in normal and sodic conditions. However, uptakes of these elements also varied. Mean concentrations of 327, 434, 541 and 624 mg/kg for Fe; 38.3, 48.9, 48.4 and 72.9 mg/kg for Mn; 47, 147, 217 and 226 mg/kg for Al and 5, 22, 48 and 51 mg/kg for B were recorded in pH 8.2, pH 8.2 +WL, pH 9.4 and pH 9.4 +WL treatments, respectively. Besides Mn, the elements concentration in wheat was 3-6 times greater than critical limit for the above mentioned elements. Genotype HD 2189, was the best performer and showed minimum increase in shoot Fe, Mn, Al and B concentration both under higher pH and waterlogging, whereas Brookton showed maximum increase. KRL 3-4 performed better despite high Fe and Mn indicating higher tissue tolerance. These observations point towards identification of considerable genetic diversity for Fe, Mn, Al and B in wheat.
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