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. 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. Transpirational water use efficiency wue is affected by nutrient and water supply, but relatively little is known about the response of andean root and tuber crops, such as edible canna canna edulis ker. In this research, 18 alfalfa genotypes from different geographical origins were evaluated under irrigated and rainfed. Poulton, karl auerswald and hans schnyder, intrinsic water.
Crop science abstract wateruse efficiency and carbon. Pdf greater agronomic water use efficiency in wheat and. Growth, co 2 assimilation rate a, leaf conductance g, transpiration efficiency w ratio biomass productionplant water use and carbon isotope discrimination. Wue is physiologically and genetically linked to carbon isotope discrimination cid in leaves of plants. Tree water use, water use efficiency, and carbon isotope. Use efficiency and carbon isotope discrimination in wheat. Selection for greater agronomic wateruse efficiency in wheat and rice using carbon isotope discrimination 311 d1rc943 code.
Wateruse efficiency and carbon isotope discrimination in two. Effects of water and nitrogen supply on water use efficiency. Research was undertaken to determine if differences in. Carbon isotope discrimination, wateruse efficiency, growth, and mortality in a natural shrub population received. The relationship between water use efficiency wue and. The interactions between plant nutritional status and plant water relations have been assessed widely matyssek, 1986. 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.
Genotypic variability in carbon isotope discrimination and. Crop science abstract carbon isotope discrimination and. Isotopic composition of plant carbon correlates with water. Carbon isotope discrimination and yield in coolseason grasses. Correlation between wateruse efficiency and carbon isotope discrimination in. A population of 148 recombinant inbred lines rils of sunflower derived from a cross between xrq and psc8 lines was studied to identify. Carbon isotope discrimination indicates improving water. Differential response of leaf conductance, carbon isotope. In this research, 18 alfalfa genotypes from different geographical origins were evaluated under irrigated and rainfed conditions in organically managed fields in. 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 505 rr rp where r is the 3czc molar ratio of reactant and re is that of the product.
Defined in this way, a kinetic isotope effect can be thought of as the ratio of. 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. Pdf tree water use, water use efficiency, and carbon. 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. Genetic control of water use efficiency and leaf carbon. Greater agronomic water use efficiency in wheat and rice using carbon isotope discrimination. Carbon isotope discrimination as indicator of water. 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. 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. Theory a relationship between carbon isotopic discrimination and water use eficiency. Greater agronomic water use efficiency in wheat and rice. Selection for carbon isotope discrimination a has potential for improving wateruse efficiency in coolseason grasses.
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. When analyzed in detail, this fractionation provides information. Carbon isotope discrimination and plant wateruse efficiency. Basal area growth, carbon isotope discrimination, and. Pdf water use efficiency, carbon isotope discrimination and. 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. Compared with the control plants not treated with sap, the application of sap. Leaf age, canopy position, and habitat affect the carbon. 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. Association of carbon isotope discrimination with leaf gas. 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. Improving crop water use efficiency using carbon isotope. 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. Jul 03, 2014 high water use efficiency wue can be achieved by coordination of biomass accumulation and water consumption.
Water use efficiency, carbon isotope discrimination and biomass. Selection for greater agronomic wateruse efficiency in. Discrimination against 3c02 by plants generally decreases with altitude korner et al. The ratio was negatively correlated with carbon isotope discrimination, in accord with theory. Drought stress is one of the most limiting factors to crop production in semiarid regions. Carbon isotope discrimination and wateruse efficiency atmospheric c02 contains two stable isotopes, i3c and i2c in a ratio of approximately 1. 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. 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 and water use efficiency atmospheric c02 contains two stable isotopes, i3c and i2c in a ratio of approximately 1. 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. Based on the definitions of intrinsic, instantaneous and integrated water use efficiency, we discuss the implications for interpreting. Because of its relationship with wateruse efficiency w, carbon isotope discrimination in leaves. Box 1600 canberra, act australia tel 0061 2 6246 5034. Anthony condon csiro, division of plant industry black mountain laboratories g. Carbon isotope discrimination, wateruse efficiency. Agronomic water use efficiency in wheat and rice using carbon isotope discrimination d120 08. 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 water use efficiency in native plants of the northcentral rockies.
Carbon isotope discrimination and water use efficiency. In this study we examined the relationship between w and. Key words carbon isotope discrimination 9 growth mortality size 9 wateruse efficiency. Integrated measurements of the stable carbon isotope. Introdlction soil feniut and water availability are major limiting factors for the growth of forest trees. Carbon isotope discrimination, wateruse efficiency, growth.
Agronomic wateruse efficiency in wheat and rice using carbon isotope discrimination d120 08. Leaf gas exchange, carbon isotope discrimination, and. Effects of soil strength on the relation of wateruse. 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. The present study involved measurements of the stable carbon isotope composition. 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. P, and pn, e, and gs as well as instantaneous wateruse efficiency, wue pne were consistently lower, compared to ksufficient plants. Water use efficiency, carbon isotope discrimination and biomass production of two sugar beet varieties under well. 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. Correlation between wateruse efficiency and carbon isotope. Sap 45 kgha was mixed into the top 10 cm soil layer at sowing in lysimeters. Carbon isotope discrimination as a tool to explore c4. Relationship between leaf carbon isotope discrimination. Carbon isotope discrimination, wateruse efficiency, growth, and.
The result showed that drought stress clearly reduced plant biomass, leaf area, leaf number, relative. Carbon isotope discrimination and wateruse efficiency in native plants of the northcentral rockies. To evaluate genotypic variability in carbon isotope discrimination or cid and water use efficiency or wue, recombinant inbred lines rils population of sunflower helianthus annuus l. 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. 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. The ratio of carbon accumulation to transpiration, w, of wheat triticum aestivum l. Use efficiency and carbon isotope discrimination in. 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.
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