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The Relationship Between the Stay-Green Trait and Grain Yield in Elite Sorghum Hybrids Grown in a Range of Environments

Jordan, D. R. and Hunt, C. H. and Cruickshank, A. W. and Borrell, A. K. and Henzell, R. G. (2012) The Relationship Between the Stay-Green Trait and Grain Yield in Elite Sorghum Hybrids Grown in a Range of Environments. Crop Science, 52 (3). pp. 1153-1161. ISSN 0011-183X

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Article Link(s): http://dx.doi.org/10.2135/cropsci2011.06.0326

Abstract

The stay-green drought adaptation mechanism has been widely promoted as a way of improving grain yield and lodging resistance in sorghum [Sorghum bicolor (L.) Moench] and as a result has been the subject of many physiological and genetic studies. The relevance of these studies to elite sorghum hybrids is not clear given that they sample a limited number of environments and were conducted using inbred lines or relatively small numbers of experimental F-1 hybrids. In this study we investigated the relationship between stay-green and yield using data from breeding trials that sampled 1668 unique hybrid combinations and 23 environments whose mean yields varied from 2.3 to 10.5 t ha(-1). The strength and direction of the association between stay-green and grain yield varied with both environment and genetic background (male tester). The majority of associations were positive, particularly in environments with yields below 6 t ha(-1). As trial mean yield increased above 6 t ha(-1) there was a trend toward an increased number of negative associations; however, the number and magnitude of the positive associations were larger. Given that post-flowering drought is very commonly experienced by sorghum crops world wide and average yields are 1.2 and 2.5 t ha(-1) for the world and Australia, respectively, our results indicate that selection for stay-green in elite sorghum hybrids may be broadly beneficial for increasing yield in a wide range of environments.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:ustralian Grains Research and Development Corporation (GRDC) We acknowledge the Australian Grains Research and Development Corporation (GRDC; http://www.grdc.com.au) for providing part of the financial support for this research. Crop science soc amer Madison
Keywords:bicolor l. moench drought resistance improve yield leaf-area senescence components variety stress
Subjects:Science > Botany > Genetics
Plant culture > Field crops > Sorghum
Deposited On:08 Apr 2014 04:15
Last Modified:08 Apr 2014 04:15

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