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dc.contributorSerraj, Rachiden_US
dc.creatorHong, Huen_US
dc.identifier.citationHu Hong, Rachid Serraj. (1/1/2012). Involvement Of Peduncle Elongation, Anther Dehiscence And Spikelet Sterility In Upland Rice Response To Reproductive-Stage Drought Stress. Environmental and Experimental Botany, 75, pp. 120-127.en_US
dc.description.abstractReproductive stage drought stress results in dramatic reduction of spikelet fertility and grain yield of upland rice (Oryza sativa L). The hypothesis investigated here is that spikelet sterility under pre-anthesis drought is triggered by deficient plant water status that inhibits peduncle elongation, panicle exsertion and anther dehiscence. A set of 45 rice genotypes was grown in an upland field under well-watered and drought-stressed conditions. Irrigation was applied using a drip irrigation system, and the drought stress treatment was initiated differentially for each genotype at 10-15 days before heading. Drought stress substantially reduced grain yield, and the average yield in the drought treatment was only 20% of that of the control. Peduncle elongation rate (PER) was significantly inhibited by drought, simultaneously with the decrease of plant water status parameters. Yield was highly associated with spikelet fertility (r = 0.74***), PER (r = 0.47***), leaf water potential (LWP) (r = -0.4**), and peduncle water potential (PWP) (r = -0.38**). The sensitivity of anther dehiscence to drought stress, as determined by the anatomic structure of anther walls, did not differ among genotypes. Path analysis revealed that spikelet fertility and PER had a major positive effect on yield, while peduncle length and LWP had negative effects. PWP had a small direct effect, but had a high negative indirect effect on yield through spikelet fertility reduction. PER had a high and positive indirect effect on yield under drought through spikelet fertility. It is concluded that PER is key parameter that affects rice yield through the regulation of spikelet fertility by plant water status under drought. (C) 2011 Elsevier B.V. All rights reserved.en_US
dc.publisherElsevier (12 months)en_US
dc.sourceENVIRONMENTAL AND EXPERIMENTAL BOTANY;75,(2011) Pagination 120-127en_US
dc.subjectspikelet sterilityen_US
dc.subjectwater statusen_US
dc.titleInvolvement Of Peduncle Elongation, Anther Dehiscence And Spikelet Sterility In Upland Rice Response To Reproductive-Stage Drought Stressen_US
dc.typeJournal Articleen_US
cg.subject.agrovocreproductive stageen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerInternational Rice Research Institute - IRRIen_US
cg.contributor.centerNanjing Agricultural University, College of Life Sciences - NAJU - CoLSen_US
cg.contributor.funderGeneration Challenge Programme (GCP)en_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.isijournalISI Journalen_US
dc.identifier.statusTimeless limited accessen_US

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