Ye H, Song L, Schapaugh WT, Ali ML, Sinclair TR, Riar MK, Raymond RN, Li Y, Vuong T, Valliyodan B, Pizolato Neto A, Klepadlo M, Song Q, Shannon JG, Chen P, Nguyen HT.
J Exp Bot. 2019 Apr 13. pii: erz150. doi: 10.1093/jxb/erz150.
Slow canopy wilting (SW) is a water-conservation trait controlled by quantitative trait loci (QTL) in late maturity-group soybeans [Glycine max (L.) Merr.]. Recently, two exotic (landraces) plant-introductions (PI 567690 and PI 567731) were identified as new SW lines in early maturity-groups. Here, we show that the two PIs share the same water conservation strategy of limited-maximum transpiration rates as PI 416937. However, in contrast to PI 416937, the transpiration rates of these PIs were sensitive to an aquaporin inhibitor, indicating an independence between limited-maximum transpiration and the lack of silver-sensitive aquaporins. Yield tests of selected recombinant-inbred lines from two elite/exotic crosses provide direct evidence to support the benefit of SW in drought tolerance. Four SW QTL mapped in a Pana × PI 567690 cross at multiple environments were found to be co-located with previous reports. Moreover, two new SW QTL were mapped on chromosomes 6 and 10 from a Magellan × PI 567731 cross. These two QTL explain the observed relatively large contributions of 20 to 30% and were confirmed in a near-isogenic background. These findings demonstrate the importance of SW in yield protection under drought and provide genetic resources for improving drought tolerance in early maturity-group soybeans.
See: https://www.ncbi.nlm.nih.gov/pubmed/30980084
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