Early Vigor of a Pyramiding Line Containing Two Quantitative Trait Loci, Phosphorus Uptake 1 ( Pup1 ) and Anaerobic Germination 1 ( AG1 ) in Rice ( O. Sativa L.)

Na-Hyun Shin, Jae-Hyuk Han, Su Jang, Kihwan Song, Hee-Jong Koh, Jong-Hee Lee, Soocheul Yoo and Joong Hyoun Chin
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Na-Hyun Shin: Department of Integrative Biological Sciences and Industry, Sejong University, Seoul 05006, Korea
Jae-Hyuk Han: Department of Integrative Biological Sciences and Industry, Sejong University, Seoul 05006, Korea
Su Jang: Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
Kihwan Song: Department of Bioindustry and Bioresource Engineering, Plant Engineering Research Institute, Sejong University, Seoul 05006, Korea
Hee-Jong Koh: Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
Jong-Hee Lee: Department of Southern Area Crop Science, National Institute of Crop Science, RDA, Miryang 50424, Korea
Soocheul Yoo: Plant Life and Environmental Science, Hankyong National University, Anseong 17579, Korea
Joong Hyoun Chin: Department of Integrative Biological Sciences and Industry, Sejong University, Seoul 05006, Korea

Agriculture, 2020, vol. 10, issue 10, 1-11

Abstract: Direct-seeded rice is one of the solutions against the issues of limited labor and time in the rice cropping system. Improved useful traits, such as fertilizer uptake and anaerobic germination, are needed to increase yield and efficiency in the direct seeding system in rice. Pup1 ( Phosphorous uptake1 ) containing PSTOL1 is useful in improving the phosphate uptake under rainfed/upland conditions. OsTPP7 is the major gene of AG1 ( Anaerobic Germination ), which shows anaerobic germination. IR64-Pup1-AG1 (I-PA) was developed by pyramiding Pup1 and AG1 . Around 20% of the chromosomal segments from the donor remained in I-PA. Phenotypic analysis revealed that I-PA showed better phenotypic performance under low and normal P conditions by enhancing the root system and tiller numbers during the early stage. Significantly better P uptake capacity of I-PA was observed upon a P-supplied soil condition. The coleoptile length and germination rate of I-PA showed tolerance under anaerobic-germinated conditions. PSTOL1 and OsTPP7 were independently expressed under different P conditions of soils, as well as anaerobic conditions. The newly developed breeding lines, I-PA, showed early vigor capacity through a high number of tillers, better P uptake, and germination in low-oxygen conditions. It will be a useful and improved breeding line for direct seeding rice breeding programs.

Keywords: phosphorous uptake; anaerobic germination; early vigor; Pup1; OsTPP7; QTL pyramiding; rice (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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