Genetic dissection of pre-flowering growth and development in Sorghum bicolor L. Moench under well-watered and drought conditions

Phuong, N. and Afolayan, G. and El Soda, M. and et al, . (2014) Genetic dissection of pre-flowering growth and development in Sorghum bicolor L. Moench under well-watered and drought conditions. Agricultural Sciences, 5. pp. 923-934.

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Abstract

The goal of the present study is to identify QTL regions influencing pre-flowering drought tolerance and agronomic performance of sorghum under early season drought stress conditions. The random occurrence of drought after sowing leads to reduced growth rates and delayed flowering and harvest time. A good rooting system and high leaf areas are required to acquire water from the soil and facilitate a high level of assimilation production during stress cycles and during recovery following each stress cycle. A RIL population was grown in pots under controlled-environment conditions. Experiments included a treatment in which plants were cultivated in a continuously drying soil and a well-watered control. Drought stress was induced by withholding irrigation water from the plants for three to four weeks after sowing. Plants were harvested prior to flowering and leaf area, leaf, stem and root dry weights, root lengths and water consumption were measured. Composite interval mapping was performed for 13 traits and significant QTL were claimed at LOD > 2.5. A total of 50 QTL were detected on ten chromosomes or 14 linkage groups, respectively. The most promising regions for good agronomic performance under pre-flowering drought stress were identified on chromosomes SBI-01, SBI-02, SBI-05 and SBI-06. While QTL hotspots on SBI-01 and SBI-02 affected mainly vegetative traits, some regions on SBI-05 and SBI- 06 have large effects on yield and yield components. Co-localizations of yield-related parameters and vegetative traits on SBI-05 support the hypothesis that high leaf area production under drought stress is directly related to increasing yields under stress

Item Type: Article
Uncontrolled Keywords: Grain Sorghum, Drought Stress, Vegetative Growth, Water Use Efficiency, QTL
Author Affiliation: Institute of Biological Production Systems, Leibniz Universität Hannover, Hannover, Germany
Subjects: Crop Improvement
Divisions: Sorghum
Depositing User: Mr T L Gautham
Date Deposited: 06 Feb 2015 10:31
Last Modified: 06 Feb 2015 10:31
URI: http://eprints.icrisat.ac.in/id/eprint/13506

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