Impact of high temperature stress on floret fertility and individual grain weight of grain sorghum: sensitive stages and thresholds for temperature and duration

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dc.contributor.author Vara Prasad, P.V.
dc.contributor.author Djanaguiraman, M.
dc.contributor.author Perumal, R.
dc.contributor.author Ciampitti, Ignacio A.
dc.date.accessioned 2016-03-30T01:38:07Z
dc.date.available 2016-03-30T01:38:07Z
dc.identifier.uri http://hdl.handle.net/2097/32211
dc.description Citation: Prasad, P. V. V., Djanaguiraman, M., Perumal, R., & Ciampitti, I. A. (2015). Impact of high temperature stress on floret fertility and individual grain weight of grain sorghum: sensitive stages and thresholds for temperature and duration. Frontiers in Plant Science, 6, 11. doi:10.3389/fpls.2015.00820
dc.description Sorghum [Sorghum bicolor (L.) Moench] yield formation is severely affected by high temperature stress during reproductive stages. This study pursues to (i) identify the growth stage(s) most sensitive to high temperature stress during reproductive development, (ii) determine threshold temperature and duration of high temperature stress that decreases floret fertility and individual grain weight, and (iii) quantify impact of high daytime temperature during floret development, flowering and grain filling on reproductive traits and grain yield under field conditions. Periods between 10 and 5 d before anthesis; and between 5 d before- and 5 d after-anthesis were most sensitive to high temperatures causing maximum decreases in floret fertility. Mean daily temperatures >25 degrees C quadratically decreased floret fertility (reaching 0% at 37 degrees C) when imposed at the start of panicle emergence. Temperatures ranging from 25 to 37 degrees C quadratically decreased individual grain weight when imposed at the start of grain filling. Both floret fertility and individual grain weights decreased quadratically with increasing duration (0-35 d or 49 d during floret development or grain filling stage, respectively) of high temperature stress. In field conditions, imposition of temperature stress (using heat tents) during floret development or grain filling stage also decreased floret fertility, individual grain weight, and grain weight per panicle.
dc.relation.uri https://doi.org/10.3389/fpls.2015.00820
dc.rights Attribution 4.0 International (CC BY 4.0)
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.subject Abiotic Stress
dc.subject Floret Fertility
dc.subject Grain Size
dc.subject Reproductive Success
dc.subject Sensitive Stage
dc.subject Spikelet Fertility
dc.title Impact of high temperature stress on floret fertility and individual grain weight of grain sorghum: sensitive stages and thresholds for temperature and duration
dc.type Article
dc.date.published 2015
dc.citation.doi 10.3389/fpls.2015.00820
dc.citation.issn 1664-462X
dc.citation.issue OCTOBER
dc.citation.jtitle Frontiers in Plant Science
dc.citation.spage 11
dc.citation.volume 6
dc.contributor.authoreid vara
dc.contributor.authoreid ciampitti


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Attribution 4.0 International (CC BY 4.0) Except where otherwise noted, the use of this item is bound by the following: Attribution 4.0 International (CC BY 4.0)

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