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

Noraziyah Abd Aziz Shamsudin, B. P Mallikarjuna Swamy, R Wickneswari V Ratnam, Ma Teressa Sta. Cruz, Nitika Sandhu, Anitha K. Raman, Arvind Kumar

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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. qDTY2.2, qDTY3.1, and qDTY12.1 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. BC1F3 derived pyramided lines (PLs) with different combinations of qDTY2.2, qDTY3.1, and qDTY12.1 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 BC1F5 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 (qDTY2.2 +qDTY12.1) performed better than PLs with other qDTY combinations, indicating the presence of a positive interaction between qDTY2.2 and qDTY12.1 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.

Original languageEnglish
Article number21
Pages (from-to)1-13
Number of pages13
JournalRice
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Dec 2016

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cultivar
quantitative trait loci
rice
drought
cultivars
grain yield
drought tolerance
dry season
water stress
drought stress
flowering
breeding
tolerance
trial
marker

Keywords

  • Drought
  • Drought yield QTLs
  • Marker assisted breeding
  • Pyramiding
  • Rice

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Soil Science

Cite this

Pyramiding of drought yield QTLs into a high quality Malaysian rice cultivar MRQ74 improves yield under reproductive stage drought. / Abd Aziz Shamsudin, Noraziyah; Swamy, B. P Mallikarjuna; V Ratnam, R Wickneswari; Sta. Cruz, Ma Teressa; Sandhu, Nitika; Raman, Anitha K.; Kumar, Arvind.

In: Rice, Vol. 9, No. 1, 21, 01.12.2016, p. 1-13.

Research output: Contribution to journalArticle

Abd Aziz Shamsudin, Noraziyah ; Swamy, B. P Mallikarjuna ; V Ratnam, R Wickneswari ; Sta. Cruz, Ma Teressa ; Sandhu, Nitika ; Raman, Anitha K. ; Kumar, Arvind. / Pyramiding of drought yield QTLs into a high quality Malaysian rice cultivar MRQ74 improves yield under reproductive stage drought. In: Rice. 2016 ; Vol. 9, No. 1. pp. 1-13.
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AU - V Ratnam, R Wickneswari

AU - Sta. Cruz, Ma Teressa

AU - Sandhu, Nitika

AU - Raman, Anitha K.

AU - Kumar, Arvind

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AB - 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. qDTY2.2, qDTY3.1, and qDTY12.1 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. BC1F3 derived pyramided lines (PLs) with different combinations of qDTY2.2, qDTY3.1, and qDTY12.1 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 BC1F5 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 (qDTY2.2 +qDTY12.1) performed better than PLs with other qDTY combinations, indicating the presence of a positive interaction between qDTY2.2 and qDTY12.1 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.

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