Differential genotypic tolerance response to manganese stress in triticale
1999
Zhang, X. | Jessop, R.S. | Ellison, F.
Manganese (Mn) tolerance response in two aluminum (Al)-tolerant triticale (x Triticosecale Wittmack) varieties was characterized by measurements of growth and dry matter production of seedlings in nutrient solution culture containing 100 mg L(-1) Mn. Root weight index (RWI) and total weight index (TWI) based on relative plant growth were two indicators of differentiating genotypic Mn tolerance; these two indices were used to make a comparative assessment of the degree of Mn tolerance in a group of eight Australian and South African genotypes which differ in apparent Al tolerance. The G4-95A was more Mn-tolerant than its Al-tolerant counterpart Tahara. A wide range of Mn tolerance was found in the eight genotypes, but few were tolerant of both Al and Mn stresses; measurements of RWI at 100 mg L(-1) Mn stress differentiated them into three response types (i.e., Mn-tolerant, moderately Mn-tolerant/Mn-sensitive, and Mn-sensitive) at the two critical values of 0.30 and 0.60. Covariation analysis indicated no association between Mn tolerance and Al tolerance; selective breeding for acidic stress tolerance should focus on both stress tolerances.
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