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The importance of slow canopy wilting in drought tolerance in soybean.
Sunday, 2019/05/05 | 08:37:08

Ye HSong LSchapaugh WTAli MLSinclair TRRiar MKRaymond RNLi YVuong TValliyodan BPizolato Neto AKlepadlo MSong QShannon JGChen PNguyen 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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