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Aegilops biuncialis  is a promising gene source to improve salt tolerance of wheat via interspecific hybridization. In the present work, the salt stress responses of wheat- Ae. biuncialis  addition lines were investigated during germination and in young plants to identify which  Aegilops  chromosomes can improve the salt tolerance of wheat. After salt treatments, the  Aegilops  parent and the addition lines 2M, 3M and 3M.4BS showed higher germination potential, shoot and root growth, better CO 2  assimilation capacity and less chlorophyll degradation than the wheat parent. The  Aegilops  parent accumulated less Na in the roots due to an up-regulation of  SOS1, SOS2  and  HVP1  genes, while it contained higher amount of proline, fructose, glucose, galactose, maltose and raffinose. In the leaves, lower Na level was accompanied by high amount of proline and increased expression of  NHX2  gene. The enhanced accumulation of sugars and proline was also observed in the roots of 3M and 3M.4BS addition lines. Typical mechanism of 2M addition line was the sequestration of Na into the vacuole due to the increased expression of  HVP1  in the roots and  NHX2  in the leaves. These results suggest the  Aegilops  chromosomes 2M and 3M can improve salt tolerance of wheat in different way.

Addition of Aegilops biuncialis chromosomes 2M or 3M improves the salt tolerance of wheat in different way