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Rice Milling Quality, Grain Dimensions, and Starch Branching as Affected by High Night Temperatures

Rice Milling Quality, Grain Dimensions, and Starch Branching as Affected by High Night Temperatures,10.1094/CC-82-0645,Cereal Chemistry,P. A. Counce,R

Rice Milling Quality, Grain Dimensions, and Starch Branching as Affected by High Night Temperatures   (Citations: 17)
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Cereal Chem. 82(6):645-648 Important rice grain quality characteristics such as percentage of chalky rice kernels are affected by both high and low night temperatures and by different day and day/night temperature combinations. High nighttime temperatures have also been suspected of reducing rice milling quality including head rice yields. Experiments to confirm or refute this have not been reported. A controlled climate experiment was conducted. Conditions in the chambers were identical except between 2400 and 0500 hours (midnight and 5 am). For those times, two temperature treatments were imposed: 1) 18°C (low temperature treatment) and 2) 24°C (high temperature treatment). Two cultivars were tested: LaGrue and Cypress. The high temperature treatment reduced head rice yields compared with the low temperature treatment. Grain widths were reduced for the high temperature treatment compared with the low temperature treatment. There was no effect of temperature on grain length or thickness. Amylopectin chain lengths 13-24 were increased by the high temperature treatment by ≈1%. Future research will focus on determining whether genetic vari- ability exists among cultivars in their head rice yield response to high temperatures. After identifying a source of resistance to high temperature effects, this characteristic can be incorporated into rice cultivars. In addition, ways to reduce this effect, including biotechnological remedies, have the potential for increasing rice yield and quality.
Journal: Cereal Chemistry - CEREAL CHEM , vol. 82, no. 6, pp. 645-648, 2005
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    • ...In the US, which grows mostly long-grain japonica rice and exports about half of it, high production efficiency has produced record yields in recent years (Childs 2006), due in part to the development of cultivars with improved yield potential...

    J. C. Nelsonet al. Mapping QTL main and interaction influences on milling quality in elit...

    • ...Counce et al. (2005) and Cooper et al. (2006) have shown that high nighttime air temperatures during kernel development can have deleterious effects on HRYs...
    • ...The reasons for the lower peak HRYs in some lot sets versus others could be due in part to the deleterious effects of high nighttime air temperatures cited by Counce et al. (2005) and Cooper et al. (2006)...

    T. J. Siebenmorgenet al. OPTIMAL HARVEST MOISTURE CONTENTS FOR MAXIMIZING MILLING QUALITY OF LO...

    • ...A controlled environment growth chamber study showed that rice plants exposed to high nighttime temperature during kernel development produced a greater number of thinner and empty kernels at harvest; this corresponded to a significant head rice yield reduction (HRY) (Counce et al., 2005)...
    • ...Hoshikawa (1993) and Counce et al. (2005) showed that kernel development was hampered by low or high nighttime temperatures during kernel filling...

    R. C. Bautistaet al. RICE KERNEL DIMENSIONAL VARIABILITY TRENDS

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