+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Carbon isotope discrimination, gas exchange, and water-use efficiency in crested wheatgrass clones

, : Carbon isotope discrimination, gas exchange, and water-use efficiency in crested wheatgrass clones. Crop science 31(5): 1203-1208

Carbon isotope discrimination has been proposed as a criterion in selecting for water-use efficiency (WUE) in C3 crop species. This study was conducted to determine associations among carbon isotope discrimination, leaf instantaneous WUE (WUEi), and shoot WUE (WUEs) in clones of crested wheatgrass [Agropyron desertorum (Fischer ex Link) Schultes] previously selected for low, medium, and high carbon isotope discrimination. Nine clones (three in each carbon isotope discrimination class) were grown in a greenhouse in pots weighed every third day and brought to either 0.03 or 0.12 kg kg-1 gravimetric water content. Leaf gas exchange rates and water potentials were determined at 2-wk intervals until plant harvest at 12 wk. Under drought, the ranking of carbon isotope discrimination classes for stomatal conductance agreed with previous and present carbon isotope discrimination classifications, and midday leaf water potentials averaged approximately 0.4 MPa lower in the low than in the medium or high carbon isotope discrimination class. Shoot dry weight and carbon isotope discrimination decreased with drought and were correlated positively under well-watered conditions (r = 0.77 , df = 7, P < 0.05), but not under drought. Although carbon isotope discrimination and leaf intercellular CO2 concentration of individual clones were correlated positively at each water level the expected differences between, carbon isotope discrimination classes in carbon isotope discrimination, WUEi9 and WUEs were obtained only under drought. A lower carbon isotope discrimination in low than high carbon isotope class under drought was associated with greater shoot dry weight, WUEs9, and WUEi. Across water levels, large negative correlations were found between carbon isotope discrimination and WUEi (r = -0.95 , df = 16, P < 0.01) or WUEs (r = -0.89 , df = 16). These results indicate that selection for low carbon isotope discrimination will improve water-use efficiency in crested wheatgrass under drought.


Other references

Wallace, C., 1987: Investor-owned chains took charges in 1986 to boost malpractice reserves. Modern Healthcare 17(10): 70-70

Guerrero Munoz F.; Adames C.; Fearon Z.; Way E.L., 1981: Calcium opiate antagonism in the peri aqueductal gray region. Ca2+ (0.937 .mu.mol) significantly decreased the antinociceptive activity produced by the administration of equi-analgetic doses of morphine (16 nmol), .beta.-endorphin (14 nmol) or [D-Ala2,Met5]enkephalinamide (136, 68 nmol) into the periaqueduct...

Cecconi, C.A.; Bruno, V., 1971: Biological and chemical methods of determining mineralizante nitrogen in soil. Incubation at 50% of field capacity (26 degrees C) for 20-40 days or at saturation (35 degrees C) for 2-13 weeks, autocJaving at 121 degrees C for 16 hr, and distillation with alkaline KMnO4 were compared. A mixture of l g soil + 0.3 g KMnO, + 1.2...

Sørensen, J., 1982: Reduction of ferric iron in anaerobic, marine sediment and interaction with reduction of nitrate and sulfate. Studies were carried out to elucidate the nature and importance of Fe reduction in anaerobic slurries of marine surface sediment. A constant accumulation of Fe took place immediately after the endogenous NO(3) was depleted. Pasteurized controls sh...

Bell, R.G.; Issekutz, T., 1993: Expression of a protective intestinal immune response can be inhibited at three distinct sites by treatment with anti-alpha 4 integrin. The alpha 4 integrins mediate lymphocyte adhesion to Peyer's patch high endothelial vessels and homing to Peyer's patch, as well as to mesenteric lymph nodes. In rats, immunity to infection with the nematode Trichinella spiralis is known...

Valencio, N.Felicidade.Lopes.da.Silva., 2016: Disasters: technicism and social suffering. Adopting a critical perspective of the social sciences, this study initially analyzes some aspects of the technicism of the Brazilian Civil Defense to have it as a benchmark of the usual indifference of its technical and operational personnel to t...

Ludlow, C.L.; Schulz, G.M.; Yamashita, T.; Deleyiannis, F.W., 1995: Abnormalities in long latency responses to superior laryngeal nerve stimulation in adductor spasmodic dysphonia. Sensorimotor responses to repeated electrical stimulation of the superior laryngeal nerve were compared in 8 patients with adductor spasmodic dysphonia (ADSD) and 11 normal controls to determine if adductor response disinhibition occurred in ADSD....

Hayashi, Y.; Takakura, K.; Yamade, I.; Ishikawa, H.; Wakuda, K.; Noda, Y., 1997: Co-transfer of histamine enhances implantation rate in mouse intraendometrial embryo transfer. Biology of Reproduction 56(SUPPL 1): 193

Cooper A.; Hatton C.E.; Thornley M.; Sardharwalla I.B., 1990: Alpha mannosidoses and beta mannosidoses. Journal of Inherited Metabolic Disease 13(4): 538-548

Chaudhuri, P.; Chakrabarty, M.1; Bhattacharyya, D., 1983: Modification of some tree borne seed fats for the preparation of high priced confectionary fats Shorea robusta, Mangifera indica, Madhuca latifolia, potential cocoabutter substitute. Fette Seifen Anstrichmittel 85(6): 224-227