TAILIEUCHUNG - Comparison of photosynthetic water use efficiency of sweet sorghum at canopy and leaf scales

Little is known about the response of sweet sorghum to water stress. Therefore, the aim of this study was to characterize sweet sorghum physiological water use efficiency (WUE) under progressing water stress conditions, with emphasis on the canopy scale as compared with the leaf scale. | Turk J Agric For 24 (2000) 519–525 © TÜBİTAK Comparison of Photosynthetic Water use Efficiency of Sweet Sorghum at Canopy and Leaf Scales Mustafa ÜNLÜ Farm Structures and Irrigation Department, Faculty of Agriculture, University of Çukurova, Adana-TURKEY Pasquale STEDUTO Mediterranean Agronomic Institute, CIHEAM-IAM, Bari-ITALY Received: Abstract: Little is known about the response of sweet sorghum to water stress. Therefore, the aim of this study was to characterize sweet sorghum physiological water use efficiency (WUE) under progressing water stress conditions, with emphasis on the canopy scale as compared with the leaf scale. Sweet sorghum (Sorghum bicolor (L.) Moench) was subjected to two water stress cycles. Energy, water vapor, and CO2 fluxes were estimated at the canopy scale by means of the Bowen ratio/energy balance/CO2 gradient method (BREB+), and at the leaf scale with a portable photosynthesis system. Predawn (ψb) and noon-time leaf water potential (ψn) were measured by pressure chamber. Canopy and leaf photosynthetic WUE showed parallel behavior. They decreased following an increase in leaf-to-air vapor pressure deficit (VPD) and a decrease in ψb. The variation in soil-water status, estimated by ψb, ranged from – to – MPa and in VPD from to kPa at the leaf scale, and from to kPa at the canopy scale, during the experimental period. Mean values of -1 noon-time photosynthetic WUE were around 5 and H2O for leaf and canopy scales, respectively. Şeker Sorgumunun Fotosentetik Su Kullanım Randımanının Bitki Örtü ve Yaprak Düzeylerinde Karşılaştırılması Özet: Bu çalışma, su stresine karşı gösterdiği tepkiye ilişkin çok az bilginin olması nedeniyle, şeker sorgumunun fizyolojik su kullanım randımanını kısıntılı sulama koşulları altında bitki örtü ve yaprak düzeylerinde belirleyip karşılaştırılmasını amaçlamıştır. Şeker sorgumu, iki su stres dönemi ile karşı karşıya bırakılmıştır. Bitki örtü düzeyinde enerji, .

• Nông nghiệp
• Sweet sorghum bicolor L
• Water use efficiency
• Gradient method
• Leaf scale
• Portable photosynthesis system
• Sweet sorghum
• Growth and yield
• Economy of sweet sorghum
• Sweet sorghum cultivars
• Rainfed environment
• Agricultural science
• Sorghum bicolor L stalks
• Grains for bioproduction of ethanol
• Bio ethanol
• Integrated nitrogen management
• Green fodder
• Poultry manure
• Growth and fodder yield
• Turkish Journal of Agriculture and Forestry
• Tạp chí Nông Lâm nghiệp
• Sorghum bicolor var saccharatum (L ) Mohlenbr
• Stalk and bioethanol yield
• Greenhouse gases
• BMC Plant Biology
• Carbohydrate partitioning
• SbSUTs gene expression
• Sorghum bicolor L Moench
• Sweet sorghums
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp