The effects of brief heat during early booting on reproductive, developmental and chlorophyll physiological performance in common wheat (Triticum aestivum L.)

A - Papers appearing in refereed journals

Xu, J., Lowe, C., Hernandez-Leon, S. G., Dreisigacker, S., Reynolds, M. P., Valenzuela-Soto, E. M., Paul, M. J. and Heuer, S. 2022. The effects of brief heat during early booting on reproductive, developmental and chlorophyll physiological performance in common wheat (Triticum aestivum L.). Frontiers in Plant Science. 13, p. 886541. https://doi.org/10.3389/fpls.2022.886541

AuthorsXu, J., Lowe, C., Hernandez-Leon, S. G., Dreisigacker, S., Reynolds, M. P., Valenzuela-Soto, E. M., Paul, M. J. and Heuer, S.
Abstract

Rising temperatures due to climate change threaten agricultural crop productivity. As a cool-season crop wheat is heat-sensitive, but often exposed to high temperatures during crop growing period. In the current study, a bread wheat panel of spring wheat genotypes, including putatively heat-tolerant Australian and CIMMYT genotypes, was exposed to a 5-day mild (34oC/28oC, day/night) or extreme (37oC/27oC) heat stress during the sensitive pollen developmental stage. Worsening effects on anther morphology were observed as heat stress increased from mild to extreme. Even under mild heat a significant decrease in pollen viability and number of grains per spike from primary spike was observed compared with the control (21oC/15oC), with Sunstar and two CIMMYT breeding lines performing well. A heat-specific positive correlation between the two traits indicates the important role of pollen fertility for grain setting. Interestingly, both mild and extreme heat induced development of new tillers after the heat stress, providing an alternative sink for accumulated photosynthates and significantly contributing to the final yield. Measurements of flag leaf maximum potential quantum efficiency of Photosystem II (Fv/Fm) showed an initial inhibition after the heat treatment, followed by a full recovery within a few days. Despite this, model fitting using chlorophyll SPAD measurements showed an earlier onset or faster senescence rate under heat stress. The data presented here provide interesting entry points for further research into pollen fertility, tillering dynamics and leaf senescence under heat. The identified heat-tolerant wheat genotypes can be used to dissect the underlying mechanisms and breed climate-resilient wheat.

KeywordsHeat stress; Booting; Pollen viability; Tillering; SPAD and Fv/Fm; Wheat
Year of Publication2022
JournalFrontiers in Plant Science
Journal citation13, p. 886541
Digital Object Identifier (DOI)https://doi.org/10.3389/fpls.2022.886541
Web address (URL)https://www.frontiersin.org/articles/10.3389/fpls.2022.886541/abstract
Open accessPublished as ‘gold’ (paid) open access
FunderBBSRC Newton funding
Biotechnology and Biological Sciences Research Council
Funder project or codeSAFERGUARDING SONORA'S WHEAT FROM CLIMATE CHANGE
Designing Future Wheat (DFW) [ISPG]
Publisher's version
Copyright license
CC BY 4.0
Accepted author manuscript
Copyright license
CC BY 4.0
Supplemental file
Copyright license
CC BY 4.0
Output statusPublished
Publication dates
Online16 May 2022
Publication process dates
Accepted04 Apr 2022
PublisherFrontiers Media SA
ISSN1664-462X

Permalink - https://repository.rothamsted.ac.uk/item/98860/the-effects-of-brief-heat-during-early-booting-on-reproductive-developmental-and-chlorophyll-physiological-performance-in-common-wheat-triticum-aestivum-l

14 total views
4 total downloads
14 views this month
3 downloads this month
Download files as zip