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Molecular and Physiological Responses of Rice and Weedy Rice to Heat and Drought Stress

Author

Listed:
  • Leonard Bonilha Piveta

    (Crop Protection Graduate Program (Programa de Pós-Graduação em Fitossanidade), Federal University of Pelotas (Universidade Federal de Pelotas), Pelotas, RS CEP 96160-000, Brazil)

  • Nilda Roma-Burgos

    (Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704, USA)

  • José Alberto Noldin

    (Epagri/Itajai Experimental Station, Itajaí, SC 88318-112, Brazil)

  • Vívian Ebeling Viana

    (Crop Protection Graduate Program (Programa de Pós-Graduação em Fitossanidade), Federal University of Pelotas (Universidade Federal de Pelotas), Pelotas, RS CEP 96160-000, Brazil)

  • Claudia de Oliveira

    (Crop Protection Graduate Program (Programa de Pós-Graduação em Fitossanidade), Federal University of Pelotas (Universidade Federal de Pelotas), Pelotas, RS CEP 96160-000, Brazil)

  • Fabiane Pinto Lamego

    (Embrapa Pecuária Sul, Bagé, RS 96401-970, Brazil)

  • Luis Antonio de Avila

    (Crop Protection Graduate Program (Programa de Pós-Graduação em Fitossanidade), Federal University of Pelotas (Universidade Federal de Pelotas), Pelotas, RS CEP 96160-000, Brazil)

Abstract

Rice is the staple food for about half of the world population. Rice grain yield and quality are affected by climatic changes. Arguably, rice cultivars’ genetic diversity is diminished from decades of breeding using narrow germplasm, requiring introgressions from other Oryza species, weedy or wild. Weedy rice has high genetic diversity, which is an essential resource for rice crop improvement. Here, we analyzed the phenotypic, physiological, and molecular profiles of two rice cultivars (IRGA 424 and SCS119 Rubi) and five weedy rice (WR), from five different Brazilian regions, in response to heat and drought stress. Drought and heat stress affected the phenotype and photosynthetic parameters in different ways in rice and WR genotypes. A WR from Northern Brazil yielded better under heat stress than the non-stressed check. Drought stress upregulated HSF7A while heat stress upregulated HSF2a . HSP74.8 , HSP80.2, and HSP24.1 were upregulated in both conditions. Based on all evaluated traits, we hypothesized that in drought conditions increasing HSFA7 expression is related to tiller number and that increase WUE (water use efficiency) and HSFA2a expression are associated with yield. In heat conditions, G s (stomatal conductance) and E’s increases may be related to plant height; tiller number is inversely associated with HSPs expression, and chlorophyll content and C i (intercellular CO 2 concentration) may be related to yield. Based on morphology, physiology, and gene regulation in heat and drought stress, we can discriminate genotypes that perform well under these stress conditions and utilize such genotypes as a source of genetic diversity for rice breeding.

Suggested Citation

  • Leonard Bonilha Piveta & Nilda Roma-Burgos & José Alberto Noldin & Vívian Ebeling Viana & Claudia de Oliveira & Fabiane Pinto Lamego & Luis Antonio de Avila, 2020. "Molecular and Physiological Responses of Rice and Weedy Rice to Heat and Drought Stress," Agriculture, MDPI, vol. 11(1), pages 1-21, December.
    • Handle: RePEc:gam:jagris:v:11:y:2020:i:1:p:9-:d:467869
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    References listed on IDEAS

    as
    1. Jinyang Wang & Cong Wang & Nannan Chen & Zhengqin Xiong & David Wolfe & Jianwen Zou, 2015. "Response of rice production to elevated [CO 2 ] and its interaction with rising temperature or nitrogen supply: a meta-analysis," Climatic Change, Springer, vol. 130(4), pages 529-543, June.
    2. Madana M. R. Ambavaram & Supratim Basu & Arjun Krishnan & Venkategowda Ramegowda & Utlwang Batlang & Lutfor Rahman & Niranjan Baisakh & Andy Pereira, 2014. "Coordinated regulation of photosynthesis in rice increases yield and tolerance to environmental stress," Nature Communications, Nature, vol. 5(1), pages 1-14, December.
    3. Nathaniel D. Mueller & James S. Gerber & Matt Johnston & Deepak K. Ray & Navin Ramankutty & Jonathan A. Foley, 2012. "Closing yield gaps through nutrient and water management," Nature, Nature, vol. 490(7419), pages 254-257, October.
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