English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Background  With the objective of improving the grain yield (GY) of the Malaysian high quality rice cultivar MRQ74 under reproductive stage drought stress (RS), three drought yield QTLs, viz.  qDTY  2.2 ,  qDTY   3.1  , and  qDTY   12.1   were pyramided by marker assisted breeding (MAB). Foreground selection using QTL specific markers, recombinant selection using flanking markers, and background selections were performed in every generation. BC 1 F 3  derived pyramided lines (PLs) with different combinations of  qDTY  2.2 ,  qDTY   3.1  , and  qDTY   12.1   were evaluated under both RS and non-stress (NS) during the dry season (DS) of 2013 and 2014 at IRRI.    Results  The GY reductions in RS trials compared to NS trials ranged from 79 to 99 %. Plant height (PH) was reduced and days to flowering (DTF) was delayed under RS. Eleven BC 1 F 5  MRQ74 PLs with yield advantages of 1009 to 3473 kg ha −1  under RS and with yields equivalent to MRQ74 under NS trials were identified as promising drought tolerance PLs. Five best PLs, IR 98010-126-708-1-4, IR 98010-126-708-1-3, IR 98010-126-708-1-5, IR 99616-44-94-1-1, and IR 99616-44-94-1-2 with a yield advantage of more than 1000 kg ha −1  under RS and with yield potential equivalent to that of MRQ74 under NS were selected. The effect of three drought grain yield QTLs under RS in MRQ74 was validated. Under NS, PLs with two  qDTY  combinations ( qDTY   2.2  +  qDTY   12.1  ) performed better than PLs with other  qDTY  combinations, indicating the presence of a positive interaction between  qDTY   2.2   and  qDTY   12.1   in the MRQ74 background.    Conclusion  Drought tolerant MRQ74 PLs with a yield advantage of more than 1000 kg ha −1  under RS were developed. Differential yield advantages of different combinations of the  qDTYs  indicate a differential synergistic relationship among  qDTYs .

Pyramiding of drought yield QTLs into a high quality Malaysian rice cultivar MRQ74 improves yield under reproductive stage drought