Prasad, P.V.V. and Jagadish, S.V.K.
(2015)
Field crops and the fear of heat stress – opportunities, challenges and future directions.
Procedia Environmental Sciences, 29.
pp. 36-37.
![[img]](http://eprints.icrisat.ac.in/15473/1.hassmallThumbnailVersion/ProcediaEnvironmentalSciences_29_36-37_2015.pdf)  Preview |
|
PDF (This is an open access article)
- Published Version
| Preview
|
Abstract
The increased probability of occurrence of more intense and frequent heat stress episodes and extended warmer nights in the future
are major challenges towards sustaining agricultural production. Cereals, millets and oil seed crops respond differently to increasing
temperature at different growth and developmental stages but are highly susceptible to heat stress during the gametogenesis and
the flowering stages. Interestingly, the duration of stress exposure induces differential responses i.e. season-long exposure to hightemperature
and short episodes of heat stress coinciding with reproductive processes. Season-long high-temperature stress
decreased biomass production, seed number, individual seed weight and yield of all grain crops. Short duration heat stress
coinciding with either gametogenesis or anthesis leads to negative impact of seed-set, while stress exposure at post-anthesis stages
decreased seed filling duration leading to decreased seed weight. Based on extensive research we have identified temperature
thresholds across field crops and quantified the above changes. Impact of heat stress on pollen production, pollen viability, pollen
lipid profiles, alternations in the pollen and stigmatic surface, pollen reactive oxygen species production, their membrane damage
etc., differentiating contrasting cultivars across different field crops will be highlighted. In addition, considering the differential
rate of increase in minimum night temperature, different physiological routes inducing yield losses under high day and high night
temperature will be presented. Genetic variability across field crops in response to heat stress and more interestingly options from
wild species of wheat (higher heat tolerance at flowering), rice (heat escape through early morning flowering) and their usefulness
in heat stress tolerance breeding will be an interesting addition to our talk. The current progress achieved, opportunities available,
unaddressed challenges and future direction of research that could help in crop improvement to sustain global food production
under future hotter climates will be discussed.
| Item Type: |
Article
|
| Uncontrolled Keywords: |
Field crops, heat stress, reproductive success, temperature thresholds, wild relatives |
| Author Affiliation: |
Department of Agronomy, Kansas State University, Manhattan, Kansas 66506, United States of America |
| Subjects: |
Crop Improvement |
| Divisions: |
Other Crops |
| Depositing User: |
Mr T L Gautham
|
| Date Deposited: |
31 May 2018 10:52 |
| Last Modified: |
31 May 2018 10:52 |
| URI: |
http://eprints.icrisat.ac.in/id/eprint/15473 |
Actions (login required)
 |
View Item |
