Cytokinin elevation caused by high light intensity contributes substantially to the increase of thermotolerance of rice plants

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389030%3A_____%2F25%3A00637502" target="_blank" >RIV/61389030:_____/25:00637502 - isvavai.cz</a>

Alternative codes found

RIV/61989592:15310/25:73634849

Result on the web

<a href="https://doi.org/10.1016/j.stress.2025.100904" target="_blank" >https://doi.org/10.1016/j.stress.2025.100904</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.stress.2025.100904" target="_blank" >10.1016/j.stress.2025.100904</a>

Result language

angličtina

Original language name

Cytokinin elevation caused by high light intensity contributes substantially to the increase of thermotolerance of rice plants

Original language description

Light is a crucial factor affecting plant development. Rice (Oryza sativa) responses to high light (HL, 1300 mu mol m-2 s-1, 27 degrees C) were characterized. HL significantly elevated root-born cytokinin, trans-zeatin in leaves due to transpiration stream. Despite only minor changes in abscisic acid (ABA) and jasmonic acid (JA) levels, HL decreased expression of ABA biosynthetic gene NCED5, while promoted JA signalling pathway by down-regulated expression of repressor JAZ9. The maximum quantum yield of photosystem II (Fv/Fm) decreased, suggesting protection of photosystem II. HL stimulated sugar production, especially glucose and mannose. As modulation of cytokinin levels (applying exogenous cytokinin or inhibitors of their degradation) promoted rice thermotolerance, HL treatment causing cytokinin increase was tested on its potential positive effect on response to elevated temperature. The effects of heat stress (HS, 40 degrees C for 6 h) per se and in combination with HL were evaluated in leaves, crowns and roots. HS was applied to whole plants (HS-WP), or targeted to leaves (HS-L) or roots (HS-R). HS treatments down-regulated trans-zeatin levels. Simultaneous application of HL and HS to leaves (HL+HS-WP, HL+HS-L) reduced this impact. HL combined with HS affecting leaves also stimulated JA and auxin indole-3-acetic acid. Milder expression of HS-marker genes HSP90.2, HSP90.3, HSP26.2 and HSFA2d, and genes coding antioxidant enzymes (especially Fe-superoxide dismutase) indicated that HL increased rice thermotolerance. HL minimized strong negative effect of HS on sugars in roots. The data showed positive impacts of mid-term HL treatment on thermotolerance of rice, revealing a novel strategy for stimulation of plant defence.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10611 - Plant sciences, botany

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Plant Stress

ISSN

2667-064X

e-ISSN

2667-064X

Volume of the periodical

16

Issue of the periodical within the volume

JUN

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

100904

UT code for WoS article

001502259400001

EID of the result in the Scopus database

2-s2.0-105006731547