Novel and Transgressive Salinity Tolerance in Recombinant Inbred Lines of Rice Created by Physiological Coupling-Uncoupling and Network Rewiring Effects.

Autor:	Pabuayon ICM; Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States., Kitazumi A; Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States., Cushman KR; Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States., Singh RK; International Rice Research Institute, Los Baños, Philippines., Gregorio GB; International Rice Research Institute, Los Baños, Philippines., Dhatt B; Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, United States., Zabet-Moghaddam M; Center for Biotechnology and Genomics, Texas Tech University, Lubbock, TX, United States., Walia H; Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, United States., de Los Reyes BG; Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2021 Feb 23; Vol. 12, pp. 615277. Date of Electronic Publication: 2021 Feb 23 (Print Publication: 2021).
DOI:	10.3389/fpls.2021.615277
Abstrakt:	The phenomenon of transgressive segregation, where a small minority of recombinants are outliers relative to the range of parental phenotypes, is commonly observed in plant breeding populations. While this phenomenon has been attributed to complementation and epistatic effects, the physiological and developmental synergism involved have not been fully illuminated by the QTL mapping approach alone, especially for stress-adaptive traits involving highly complex interactions. By systems-level profiling of the IR29 × Pokkali recombinant inbred population of rice, we addressed the hypothesis that novel salinity tolerance phenotypes are created by reconfigured physiological networks due to positive or negative coupling-uncoupling of developmental and physiological attributes of each parent. Real-time growth and hyperspectral profiling distinguished the transgressive individuals in terms of stress penalty to growth. Non-parental network signatures that led to either optimal or non-optimal integration of developmental with stress-related mechanisms were evident at the macro-physiological, biochemical, metabolic, and transcriptomic levels. Large positive net gain in super-tolerant progeny was due to ideal complementation of beneficial traits while shedding antagonistic traits. Super-sensitivity was explained by the stacking of multiple antagonistic traits and loss of major beneficial traits. The synergism uncovered by the phenomics approach in this study supports the modern views of the Omnigenic Theory, emphasizing the synergy or lack thereof between core and peripheral components. This study also supports a breeding paradigm rooted on genomic modeling from multi-dimensional genetic, physiological, and phenotypic profiles to create novel adaptive traits for new crop varieties of the 21st century. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2021 Pabuayon, Kitazumi, Cushman, Singh, Gregorio, Dhatt, Zabet-Moghaddam, Walia and de los Reyes.)
Databáze:	MEDLINE
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