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Royal Veterinary and Agricultural University (Denmark) (1999)

Selection methods and genetic variability for traits related to drought resistance in sorghum

Abraha, T

Titre : Selection methods and genetic variability for traits related to drought resistance in sorghum

Auteur : Abraha, T

Etablissement de soutenance : Royal Veterinary and Agricultural University (Denmark).

Grade : Master of Science 1999

Résumé
Moisture stress is one of the most important abiotic problem contributing significantly to yield loss in arid and semi-arid environments. This problem is alleviated by developing crops that are well adapted to moisture constraint areas. Sorghum (Sorghum bicolor (L.) Moench) is an important drought tolerant crop in such areas and is a good crop model for evaluating mechanisms of moisture stress. In the first study, 3 1 random inbred lines of sorghum derived from crosses of staygreen x senescence parents and five check varieties were used to study the effect of high surface temperature on seedling emergence. Two soil covers (charcoal and kaolin) and control were used to modify the temperature to observe their effects on seedling germination. At 2 cm soil depth temperature in charcoal treatment was high and showed partial or complete failure of germination in some genotypes under study. However, few genotypes such as lCSV 112 and SSD 66 were tolerant to high temperature germination in the charcoal treated soil. In the second study, a set of 22 random inbred lines with two check genotypes of sorghum was characterized under irrigated and non irrigated (stress) conditions for the genetic variability of traits associated with flowering drought tolerance and for potentially related components of grain development. Different characters were used to estimate the post-flowering drought tolerance. Among these traits, yield and staygreen were identified with a major effect under moisture stress. The staygreen and moderate staygreen lines showed better yield performance than senesced lines under the prolonged mid-season and terminal drought. This suggests that there are some underlining mechanism that controls the expression of staygreen under post-flowering drought and contribute to yield in drought and control (wet) treatments.

Présentation : ICRISAT

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