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Heat Stress Targeting Individual Organs Reveals the Central Role of Roots and Crowns in Rice Stress Responses

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    0556320 - ÚEB 2023 RIV CH eng J - Journal Article
    Přerostová, Sylva - Jarošová, Jana - Dobrev, Petre - Hlusková, Lucia - Motyka, Václav - Filepová, Roberta - Knirsch, Vojtěch - Gaudinová, Alena - Kieber, J.J. - Vaňková, Radomíra
    Heat Stress Targeting Individual Organs Reveals the Central Role of Roots and Crowns in Rice Stress Responses.
    Frontiers in Plant Science. Roč. 12, JAN 17 (2022), č. článku 799249. ISSN 1664-462X. E-ISSN 1664-462X
    R&D Projects: GA MŠk(CZ) LTAUSA17081; GA MŠk(CZ) EF16_019/0000738; GA ČR GA20-22875S
    Institutional support: RVO:61389030
    Keywords : acclimation * antioxidant enzymes * cytokinin oxidase/dehydrogenase (CKX) * gene expression * heat shock * jasmonoyl-isoleucine * Oryza sativa (L.) * phytohormones
    OECD category: Plant sciences, botany
    Impact factor: 5.6, year: 2022
    Method of publishing: Open access

    Inter-organ communication and the heat stress (HS, 45°C, 6 h) responses of organs exposed and not directly exposed to HS were evaluated in rice (Oryza sativa) by comparing the impact of HS applied either to whole plants, or only to shoots or roots. Whole-plant HS reduced photosynthetic activity (Fv/Fm and QY_Lss), but this effect was alleviated by prior acclimation (37°C, 2 h). Dynamics of HSFA2d, HSP90.2, HSP90.3, and SIG5 expression revealed high protection of crowns and roots. Additionally, HSP26.2 was strongly expressed in leaves. Whole-plant HS increased levels of jasmonic acid (JA) and cytokinin cis-zeatin in leaves, while up-regulating auxin indole-3-acetic acid and down-regulating trans-zeatin in leaves and crowns. Ascorbate peroxidase activity and expression of alternative oxidases (AOX) increased in leaves and crowns. HS targeted to leaves elevated levels of JA in roots, cis-zeatin in crowns, and ascorbate peroxidase activity in crowns and roots. HS targeted to roots increased levels of abscisic acid and auxin in leaves and crowns, cis-zeatin in leaves, and JA in crowns, while reducing trans-zeatin levels. The weaker protection of leaves reflects the growth strategy of rice. HS treatment of individual organs induced changes in phytohormone levels and antioxidant enzyme activity in non-exposed organs, in order to enhance plant stress tolerance.
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    2022_Prerostova_Frontiers in Plant Science_799249.pdf15.5 MBOtheropen-access
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