Although the correlations of a with water use efficiency and dry matter yield are reatively clear and better understood, the correlation with nitrogen fixation still. Selection for carbon isotope discrimination a has potential for improving wateruse efficiency in coolseason grasses. High water use efficiency wue can be achieved by coordination of biomass accumulation and water consumption. Water use efficiency wue is defined as the amount of carbon assimilated as biomass or grain produced per unit of water used by the crop. Carbon isotope discrimination, wateruse efficiency, growth. Crop science abstract carbon isotope discrimination and. The relationship between water use efficiency wue and. Jul 03, 2014 high water use efficiency wue can be achieved by coordination of biomass accumulation and water consumption. Wateruse efficiency and carbon isotope discrimination in two. The primary objective of this study was to test the hypothesis that the shortterm basal area growth response to a single application of 224 kg n ha. Drought stress is one of the most limiting factors to crop production in semiarid regions. Theory a relationship between carbon isotopic discrimination and water use eficiency. Based on the definitions of intrinsic, instantaneous and integrated water use efficiency, we discuss the implications for interpreting. Effects of soil strength on the relation of wateruse.
Leaf age, canopy position, and habitat affect the carbon. Tree water use, water use efficiency, and carbon isotope discrimination in relation to growth potential in populus deltoides and hybrids under field conditions download pdf. Carbon isotope discrimination as a tool to explore c4. Carbon isotope discrimination and yield in coolseason grasses. Anthony condon csiro, division of plant industry black mountain laboratories g. Stable carbon isotope composition was determined on leaves of woody plants sampled along an 800km transect on the western flank of the rocky mountains at altitudes ranging from 610 to 2650 m above mean sea level. Greater agronomic water use efficiency in wheat and rice using carbon isotope discrimination if you would like to learn more about the iaeas work, sign up for our weekly updates containing our most important news, multimedia and more. In this research, 18 alfalfa genotypes from different geographical origins were evaluated under irrigated and rainfed. Crop science abstract wateruse efficiency and carbon. We discuss the use of carbon isotope analysis as a tool for investigating differences in wue and for selecting genotypes in a breeding programme for improved dry matter yield under drought. Carbon isotope discrimination, wateruse efficiency.
Differential response of leaf conductance, carbon isotope. When analyzed in detail, this fractionation provides information. One of the primary questions being asked is how plants will respond to a changing climate with changes in temperature, precipitation, and carbon dioxide co2 that affect their wue at the leaf level, increasing co2 increases wue until the. Carbon isotope discrimination, wateruse efficiency, growth, and.
The primary objective of this study was to test the hypothesis that the shortterm basal area growth response to a single application of 224 kg n ha1 as urea was associated with reduced stable carbon isotope discrimination. Carbon isotope discrimination indicates improving water. In this research, 18 alfalfa genotypes from different geographical origins were evaluated under irrigated and rainfed conditions in organically managed fields in. Carbon isotope discrimination, wateruse efficiency, growth, and mortality in a natural shrub population received. Defined in this way, a kinetic isotope effect can be thought of as the ratio of the rate constants for 12e and l3e containing substrates, k1 2. Pdf greater agronomic water use efficiency in wheat and.
Agronomic water use efficiency in wheat and rice using carbon isotope discrimination d120 08. The overall objective of this project is to contribute to increasing the agronomic wateruse efficiency of wheat and rice production, where agronomic wateruse efficiency is defined as grain. We discuss the use of carbonisotope analysis as a tool for investigating differences in wue and for selecting genotypes in a breeding programme for improved dry matter yield under drought. Wue is physiologically and genetically linked to carbon isotope discrimination cid in leaves of plants. The present study involved measurements of the stable carbon isotope composition. Effects of water and nitrogen supply on water use efficiency.
Sap 45 kgha was mixed into the top 10 cm soil layer at sowing in lysimeters. Poulton, karl auerswald and hans schnyder, intrinsic water. It is a key trait, linking the carbon and water cycles 3, and is a useful metric for studying the relationship between productivity, water use, and other ecosystem services,21. Carbon isotope discrimination and wateruse efficiency in native plants of the northcentral rockies. A population of 148 recombinant inbred lines rils of sunflower derived from a cross between xrq and psc8 lines was studied to identify. Selection for greater agronomic wateruse efficiency in wheat and rice using carbon isotope discrimination 311 d1rc943 code. Pdf water use efficiency, carbon isotope discrimination and. Indeed, concurrent measurements of gas exchange and carbon isotope discrimination have become a convenient tool to estimate g m, and the influence of g m on the isotope composition of dry matter needs to be considered when using. Genotypic variability in carbon isotope discrimination and.
The correlation of carbon isotope discrimination c with photosynthetic gas exchange and water use efficiency wue in maize was investigated under low rainfall conditions with or without superabsorbent polymer sap. Correlation between wateruse efficiency and carbon isotope discrimination in. The objective of this study was to test the hypothesis that the shortterm basal area growth response to a single application of 224 kg n ha1 as urea was associated with reduced stable carbon isotope discrimination. Carbon isotope discrimination and wateruse efficiency atmospheric c02 contains two stable isotopes, i3c and i2c in a ratio of approximately 1. The interactions between plant nutritional status and plant water relations have been assessed widely matyssek, 1986. Carbon isotope discrimination as indicator of water. Correlation between wateruse efficiency and carbon isotope.
Soil and water management and crop nutrition section international atomic energy agency vienna international centre po box 100 1400 vienna, austria email. Genetic control of water use efficiency and leaf carbon. The result showed that drought stress clearly reduced plant biomass, leaf area, leaf number, relative. Tree water use, water use efficiency, and carbon isotope discrimination in relation to growth potential in populus deltoides and hybrids under field conditions by christopher a.
A population of 148 recombinant inbred lines rils of sunflower derived from a cross between xrq and psc8 lines was studied to identify quantitative trait loci qtl controlling. Leaf gas exchange, carbon isotope discrimination, and. Carbon isotope discrimination and plant wateruse efficiency. Carbon isotope discrimination 505 rr rp where r is the 3czc molar ratio of reactant and re is that of the product. Greater agronomic water use efficiency in wheat and rice. Carbon isotope discrimination and water use efficiency in native plants of the northcentral rockies.
P, and pn, e, and gs as well as instantaneous wateruse efficiency, wue pne were consistently lower, compared to ksufficient plants. Box 1600 canberra, act australia tel 0061 2 6246 5034. Agronomic wateruse efficiency in wheat and rice using carbon isotope discrimination d120 08. Greater agronomic water use efficiency in wheat and rice using carbon isotope discrimination. Improving crop water use efficiency using carbon isotope.
Wed like to understand how you use our websites in order to improve them. Carbon isotope discrimination and wateruse efficiency in. Seventy eight sunflower rils were grown in greenhouse and 100 sunflower rils were grown under field condition, and measured some morphological and physiological traits including leaf. In this study we examined the relationship between w and. Association of carbon isotope discrimination with leaf gas. Introdlction soil feniut and water availability are major limiting factors for the growth of forest trees. Pdf carbon isotope discrimination and water use efficiency in. One of the primary questions being asked is how plants will respond to a changing climate with changes in temperature, precipitation, and carbon dioxide co2 that affect their wue at the leaf level, increasing co2 increases wue until the leaf is exposed to. Leaf gas exchange, carbon isotope discrimination, and grain yield in contrasting rice genotypes subjected to water deficits during the reproductive stage mauro centritto 1 institute of agroenvironmental and forest biology, national research council, via salaria km 29. Key words carbon isotope discrimination 9 growth mortality size 9 wateruse efficiency. Discrimination against 3c02 by plants generally decreases with altitude korner et al. Water use efficiency, carbon isotope discrimination and biomass production of two sugar beet varieties under well. Carbon isotope discrimination and water use efficiency. Growth, co 2 assimilation rate a, leaf conductance g, transpiration efficiency w ratio biomass productionplant water use and carbon isotope discrimination.
Integrated measurements of the stable carbon isotope. Relationship between leaf carbon isotope discrimination. Carbon isotope discrimination and water use efficiency atmospheric c02 contains two stable isotopes, i3c and i2c in a ratio of approximately 1. Basal area growth, carbon isotope discrimination, and. Selection for greater agronomic wateruse efficiency in.
Because of its relationship with wateruse efficiency w, carbon isotope discrimination in leaves. Water use efficiency wue, relates to the amount of water used to produce a unit of biomass, or a unit of fixed carbon, during photosynthesis. Water use efficiency, carbon isotope discrimination and biomass. Use efficiency and carbon isotope discrimination in wheat. Compared with the control plants not treated with sap, the application of sap. Use efficiency and carbon isotope discrimination in. An understanding of how a is affected by differential water applica tion and its association with dry mater yield may be helpful in identifying the best coolseason grass species for breeding and.
The ratio was negatively correlated with carbon isotope discrimination, in accord with theory. Pdf tree water use, water use efficiency, and carbon. The overall objective of this project is to contribute to increasing the agronomic water use efficiency of wheat and rice production, where agronomic water use efficiency is defined as grain. Tree water use, water use efficiency, and carbon isotope. The isotope fractionation also reflects limitations on photosyn thetic efficiency imposed by the vari ous diffusional and chemical compo nents of co2 uptake. Isotopic composition of plant carbon correlates with water.
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