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

Prasad PV, Djanaguiraman M, Perumal R, Ciampitti IA - Front Plant Sci (2015)

Bottom Line: Sorghum [Sorghum bicolor (L.) Moench] yield formation is severely affected by high temperature stress during reproductive stages.Temperatures ranging from 25 to 37°C quadratically decreased individual grain weight when imposed at the start of grain filling.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Agronomy, Throckmorton Plant Science Center, Kansas State University Manhattan, KS, USA.

ABSTRACT
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°C quadratically decreased floret fertility (reaching 0% at 37°C) when imposed at the start of panicle emergence. Temperatures ranging from 25 to 37°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.

No MeSH data available.


Related in: MedlinePlus

Impact of high temperature stress (36/26°C daytime maximum/nighttime minimum temperature, for 5 days) at different times relative to anthesis on (A) floret fertility, and (B) individual grain weight. Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum temperature) and shown with ± SE. Vertical bars above the lines denote LSD for comparison of treatment means. The dotted line provides reference to control means.
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Figure 1: Impact of high temperature stress (36/26°C daytime maximum/nighttime minimum temperature, for 5 days) at different times relative to anthesis on (A) floret fertility, and (B) individual grain weight. Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum temperature) and shown with ± SE. Vertical bars above the lines denote LSD for comparison of treatment means. The dotted line provides reference to control means.

Mentions: Exposure to high temperature stress (36/26°C daytime maximum/nighttime minimum temperature; mean daily temperature, 31°C) for 5 d significantly decreased floret fertility compared to optimum temperature (30/20°C; daytime maximum/nighttime minimum temperature; mean daily temperature, 25°C) when imposed at 15, 10, 5, or 0 d before anthesis and 5 and 10 d after anthesis (Figure 1A). Maximum decreases in floret fertility (43–58% of control) occurred when stress was imposed at 10, 5, or 0 d before anthesis. High temperature stress imposed at 15 d before anthesis slightly decreased floret fertility (85% of control) and 5 and 10 d after anthesis (83–92% of control). Heat stress had no influence on floret fertility when stress was imposed at stages occurring beyond 10 d after anthesis (Figure 1A).


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

Prasad PV, Djanaguiraman M, Perumal R, Ciampitti IA - Front Plant Sci (2015)

Impact of high temperature stress (36/26°C daytime maximum/nighttime minimum temperature, for 5 days) at different times relative to anthesis on (A) floret fertility, and (B) individual grain weight. Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum temperature) and shown with ± SE. Vertical bars above the lines denote LSD for comparison of treatment means. The dotted line provides reference to control means.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4594118&req=5

Figure 1: Impact of high temperature stress (36/26°C daytime maximum/nighttime minimum temperature, for 5 days) at different times relative to anthesis on (A) floret fertility, and (B) individual grain weight. Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum temperature) and shown with ± SE. Vertical bars above the lines denote LSD for comparison of treatment means. The dotted line provides reference to control means.
Mentions: Exposure to high temperature stress (36/26°C daytime maximum/nighttime minimum temperature; mean daily temperature, 31°C) for 5 d significantly decreased floret fertility compared to optimum temperature (30/20°C; daytime maximum/nighttime minimum temperature; mean daily temperature, 25°C) when imposed at 15, 10, 5, or 0 d before anthesis and 5 and 10 d after anthesis (Figure 1A). Maximum decreases in floret fertility (43–58% of control) occurred when stress was imposed at 10, 5, or 0 d before anthesis. High temperature stress imposed at 15 d before anthesis slightly decreased floret fertility (85% of control) and 5 and 10 d after anthesis (83–92% of control). Heat stress had no influence on floret fertility when stress was imposed at stages occurring beyond 10 d after anthesis (Figure 1A).

Bottom Line: Sorghum [Sorghum bicolor (L.) Moench] yield formation is severely affected by high temperature stress during reproductive stages.Temperatures ranging from 25 to 37°C quadratically decreased individual grain weight when imposed at the start of grain filling.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Agronomy, Throckmorton Plant Science Center, Kansas State University Manhattan, KS, USA.

ABSTRACT
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°C quadratically decreased floret fertility (reaching 0% at 37°C) when imposed at the start of panicle emergence. Temperatures ranging from 25 to 37°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.

No MeSH data available.


Related in: MedlinePlus