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Sara Sintayehu

Sara Sintayehu, Department of Plant Biology and Biodiversity Management P. O. Box: 3434, National Herbarium (ETH)

Title: The Study of Growth and Physiological Characters in Sorghum (Sorghum bicolor (L.) Moench) Introgression Lines Under Post flowering Drought Stress


Sara Sintayehu are expertise in plant biology and biodiversity management. She has Master of Science in plant physiology. At the time being she is a lecturer in Hararmaya University, College of Agriculture, Ethiopia. Her thesis has focused on drought tolerance mechanism of drought tolerant genotypes which were backcrossed with stay green parent. Currently she is working on project of wild edible plants in Eastern Ethiopia for increasing the food demand of the community.                                                                                                                        



Drought  is  serious  problem  in  rainfed  areas  due  to  rapid  change  in  climatic  conditions. Among prevailing abiotic stresses, it is the most significant and severe factor inhibiting plant growth and production through impairing normal growth, disturbance of water relations, reduction of water use efficiency and yield performance. The objective of this study was to evaluate growth, physiological and yield performance of sorghum introgression lines under postflowering stress. The field experiment was conducted on seven  stay-green QTLs introgression lines  (marker  assisted  backcrossing  derivatives),  two stay-green  donor  parents  and  three recurrent  parents  obtained  from  Melkassa  Agricultural  Research  Center.  The  experimental materials  were  tested  in  split plot   design  under  well watered  (WW)  and  drought  stress (DS)  growing  conditions  at  Melka Werer  field  sites  during  the  post-rainy  cropping  season  of 2014.  The  combined  ANOVA  revealed  that  effect  due  to  moisture  regimes  (MR)  was highly significant (P < 0.05) for all traits. Differences among the genotypes were also highly significant (P < 0.05) for all traits considered. Post-flowering drought stress reduced growth, physiological and yield related traits relative to the well watered condition. Drought induction  reduced  average leaf area, green leaf number, chlorophyll content, relative water content, CO2 assimilation, transpiration, water use efficiency, root length, root dry weight, grain yield,  hundred kernel  weight and panicle weight. B35, E36-1, Meko x B35-120, Meko x B35-116,   Teshale x B35-2011 and Teshale x E36-1 showed  better  drought  stress  tolerance  and  stay green  property.  Meko x B35-120, Meko x B35-116, Teshale x B35-2011 and Teshale x E36-1 was selected for maximum grain yield under post-flowering drought condition. Correlation,analysis revealed that chlorophyll content, green leaf  area,  assimilation  rate,  water  use  efficiency,  lower  rate  of  leaf  senescence, root length, root dry weight  and grain  yield  have  been  found  to  be  growth and physiological  traits for drought tolerance and for stay-green property during post-flowering stage.