Burke, J.J. and Emendack, Y. and Chad Hayes, C. and Chen, J.
(2018)
Genetic diversity in the environmental conditioning of two Sorghum (Sorghum bicolor L.) Hybrids.
American Journal of Plant Sciences, 9.
pp. 817-831.
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Abstract
Sorghum metabolism continually adapts to environmental temperature as
thermal patterns modulate diurnally and seasonally. The degree of adaptation
to any given temperature may be difficult to determine from phenotypic responses
of the plants. The present study was designed to see if the efficiency of
quantum yield of photosystem II could be used as a measure of how well leaf
tissue metabolism was able to withstand a prolonged respiratory demand
caused by elevated temperatures. The efficiency of quantum yield values of
Pioneer 84G62 and Northrup King KS585 commercial sorghum hybrids
showed that when the hybrids were grown in a 28˚C/20˚C day/night cycle in
the greenhouse or the field, Pioneer hybrid 84G62 withstood subsequent elevated
thermal challenges better than Northrup King KS585. The same hybrids
grown in a 39˚C/32˚C day/night cycle showed similar efficiency of quantum
yield values when thermally challenged. Water-deficit stress increased the heat
resistance of the tissue raising the efficiency of quantum yield of both lines to
the same level. Upon recovery from the water deficit stress the differential efficiency
of quantum yield values between the two lines re-appeared. The data
provided in this study suggest a metabolic advantage of Pioneer 84G62 to environmental
thermal challenges compared with the Northrup King KS585.
| Item Type: |
Article
|
| Uncontrolled Keywords: |
Sorghum, Sorghum bicolor L., Thermal Sensitivity, Adaptation |
| Author Affiliation: |
USDA-ARS, PA, Cropping Systems Research Laboratory, Lubbock, TX, USA |
| Subjects: |
Crop Improvement |
| Divisions: |
Sorghum |
| Depositing User: |
Mr T L Gautham
|
| Date Deposited: |
08 May 2018 06:07 |
| Last Modified: |
08 May 2018 06:07 |
| URI: |
http://eprints.icrisat.ac.in/id/eprint/15422 |
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