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Review article - Peer-reviewed, 2021

Mitigating tradeoffs in plant breeding

Dwivedi, Sangam L.; Reynolds, Matthew Paul; Ortiz, Rodomiro

Abstract

Tradeoffs among plant traits help maintain relative fitness under unpredictable conditions and maximize reproductive success. However, modifying tradeoffs is a breeding challenge since many genes of minor effect are involved. The intensive crosstalk and fine-tuning between growth and defense responsive phytohormones via transcription factors optimizes growth, reproduction, and stress tolerance. There are regulating genes in grain crops that deploy diverse functions to overcome tradeoffs, e.g., miR-156-IPA1 regulates crosstalk between growth and defense to achieve high disease resistance and yield, while OsALDH2B1 loss of function causes imbalance among defense, growth, and reproduction in rice. GNI-A1 regulates seed number and weight in wheat by suppressing distal florets and altering assimilate distribution of proximal seeds in spikelets. Knocking out ABA-induced transcription repressors (AITRs) enhances abiotic stress adaptation without fitness cost in Arabidopsis. Deploying AITRs homologs in grain crops may facilitate breeding. This knowledge suggests overcoming tradeoffs through breeding may expose new ones.

Published in

iScience
2021, volume: 24, number: 9, article number: 102965

Authors' information

Dwivedi, Sangam L.
No organisation
Reynolds, Matthew Paul
International Maize and Wheat Improvement Centre, Mexico
Ortiz, Rodomiro (Ortiz Rios, Rodomiro Octavio)
Swedish University of Agricultural Sciences, Department of Plant Breeding

UKÄ Subject classification

Genetics and Breeding
Plant Biotechnology

Publication Identifiers

DOI: https://doi.org/10.1016/j.isci.2021.102965

URI (permanent link to this page)

https://res.slu.se/id/publ/113057