Mohammed, Abdul Razack , Tarpley, Lee .
Impact of High Nighttime Temperature on Rice (Oryza sativa L.) Growth, Development and Physiology.
The presence of seasonally high nighttime temperatures (HNT) along the United States Gulf Coast and in regions of similar climate, occurring during the critical stages of development, reduces rice (Oryza sativa L.) yield and quality. The objective of this study was to determine the effects of HNT and chemical preventive treatments on growth, development, physiology and yield of rice plants. Plants were grown under ambient nighttime temperature (ANT) (27 oC) or HNT (32 oC) in the greenhouse. They were subjected nightly to a HNT through use of continuously controlled infrared heaters, starting from 2000 h until 0600 h. The HNT did not affect plant growth and development except for leaf number and total leaf area. Elevated nighttime temperatures did not hasten crop development rate, as indicated by the dates of panicle emergence. Plants grown under HNT showed a 54% decrease in panicle dry weight (PDW) compared to ANT. Reduction in PDW appeared to be due to insufficient photosynthate supply to the grain as a result of a decrease in net leaf photosynthesis (Pn) and an increase in respiration rates. Rice plants pre-treated with the salicylic acid or glycine betaine generally showed an increase in PDW (up to 107% increase) and Pn and a decrease in respiration rate compared to untreated plants, when grown under HNT.
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1 - Texas Agricultural Experiment Station, TAMU Dept. Soil and Crop Sciences, 1509 Aggie Dr., Beaumont, Texas, 77713
High Nighttime Temperatures
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 1/Hilton
Date: Wednesday, July 11th, 2007
Time: 1:30 PM