Mengyu Liu: Physiological and Ecological of Water Use Efficiency

QTL Mapping for Transpiration Efficiency and Related Traits in Wheat

Chao Yan，Mengyu Liu, Fenghua Gao, Baodi Dong, Yunzhou Qiao, Lei Shi and Changhai Shi

An RIL population derived from a cross between xiaoyan54 (drought resistance) and jing411 (high water consumption) was employed to map QTLs that regulating Transpiration Efficiency (TE) and traits related to TE at wheat seedling stage under drought stress and well-watered conditions through a pot experiment. The preliminary results showed that TE and its related properties obey normal distribution, and thus, they are all recognized as quantitative characters. Seventeen QTLs of five characters including TE, root biomass, above-ground biomass and total dry matter were detected in the present study. Under drought condition, two additive QTLs of TE was identified to locate on 2D chromosome (ms311-ms382) and 5B chromosome (ba216-ms274.2) respectively, with their contribute rate of 10.56%. It was found that 6 QTLs related to TE, including 2 of total dry matter and 1 of water consumption, located on 1D and 7A chromosome,

respectively; Under well-watered condition, we found 1 QTL of TE to be located on 5B (ms604.2-ba140) chromosome with a contribution rate of 9.66%. 8 QTLs of traits related

to TE was detected, including 3 of total dry matter and 2 of water consumption, to be located on 1D, 4B, 4D, 2A chromosome respectively. Therefore, it can be indicated that the most important gene segment controlling TE should be locate on 5B chromosome.