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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 different mean daily temperatures (°C) when imposed at start of panicle emergence for a duration of 10 d on (A) floret fertility, fitted line Y = –119.7 +20.8X –0.47X2; r2 = 0.98 (P < 0.001), and (B) individual grain weight, fitted line Y = +112.5 –0.48X; r2 = 0.18 (NS). Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum) and shown with ± SE.
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Figure 2: Impact of different mean daily temperatures (°C) when imposed at start of panicle emergence for a duration of 10 d on (A) floret fertility, fitted line Y = –119.7 +20.8X –0.47X2; r2 = 0.98 (P < 0.001), and (B) individual grain weight, fitted line Y = +112.5 –0.48X; r2 = 0.18 (NS). Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum) and shown with ± SE.

Mentions: Floret fertility decreased significantly with increasing mean daily temperatures in the range of 25–40°C when imposed for a duration of 10 d at the start of panicle emergence. Floret fertility response to temperature fit a quadratic model (Figure 2A) Floret fertility decreased from about 100% of control at 25°C mean daily temperature to 0% of control at 37.4°C. Mean daily temperature in the specific range (25 through 37°C) imposed at the start of panicle emergence did not decrease individual grain weight (Figure 2B).


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 different mean daily temperatures (°C) when imposed at start of panicle emergence for a duration of 10 d on (A) floret fertility, fitted line Y = –119.7 +20.8X –0.47X2; r2 = 0.98 (P < 0.001), and (B) individual grain weight, fitted line Y = +112.5 –0.48X; r2 = 0.18 (NS). Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum) and shown with ± SE.
© Copyright Policy
Related In: Results  -  Collection

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

Figure 2: Impact of different mean daily temperatures (°C) when imposed at start of panicle emergence for a duration of 10 d on (A) floret fertility, fitted line Y = –119.7 +20.8X –0.47X2; r2 = 0.98 (P < 0.001), and (B) individual grain weight, fitted line Y = +112.5 –0.48X; r2 = 0.18 (NS). Each datum is expressed as percentage of control at optimum temperature (30/20°C, daytime maximum/nighttime minimum) and shown with ± SE.
Mentions: Floret fertility decreased significantly with increasing mean daily temperatures in the range of 25–40°C when imposed for a duration of 10 d at the start of panicle emergence. Floret fertility response to temperature fit a quadratic model (Figure 2A) Floret fertility decreased from about 100% of control at 25°C mean daily temperature to 0% of control at 37.4°C. Mean daily temperature in the specific range (25 through 37°C) imposed at the start of panicle emergence did not decrease individual grain weight (Figure 2B).

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