Genetic Variation of Stomatal Traits and Carbon Isotope Discrimination in Two Hybrid Poplar Families (Populus deltoides ‘S9-2’ × P. nigra ‘Ghoy’ and P. deltoides ‘S9-2’ × P. trichocarpa ‘V24’)

Measurements of the stable carbon isotope composition of leaf tissue were made on Piceamariana (Mill.) B.S.P trees from four full-sib families grown on three different field sites at the Petawawa National Forestry Institute, Ontario, Canada. The four families chosen exhibited genetic variation for growth characteristics. Genetic variation was also observed for carbon isotopic discrimination (Δ) among the families of P. mariana. In addition, a strong correlation occurred between Δ values measured on trees in 1991 and 1992, two years that had very different precipitation and temperature conditions during the growing season, indicating that the ranking of individual trees remained almost constant between years. A strong, negative correlation was observed between average carbon isotope discrimination and average tree height for the four families on the driest, least productive site, as was expected based on leaf photosynthetic characteristics. There was no significant correlation, however, between Δ values and growth on the other two study sites, where productivity was higher.

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Genetic variation for leaf carbon isotope discrimination and its association with transpiration efficiency in canola (Brassica napus)

Functional Plant Biology ◽

10.1071/fp19256 ◽

2020 ◽

Vol 47 (4) ◽

pp. 355

Author(s):

Shek M. Hossain ◽

Josette Masle ◽

Andrew Easton ◽

Malcolm N. Hunter ◽

Ian D. Godwin ◽

...

Keyword(s):

Genetic Variation ◽

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Genotypic Variation ◽

Dry Weight ◽

Transpiration Efficiency ◽

Isotope Discrimination ◽

Leaf Chlorophyll ◽

Total Dry Weight ◽

Positive Correlations

Drought is a major constraint to canola production around the world. There is potential for improving crop performance in dry environments by selecting for transpiration efficiency (TE). In this work we investigated TE by studying its genetic association with carbon isotope discrimination (Δ) and other traits, e.g. specific leaf weight (SLW) and leaf chlorophyll content (SPAD). Among the 106 canola genotypes – including open-pollinated, hybrid, inbred types and cytoplasmic variants – tested in the field and glasshouse there was significant genotypic variation for TE, Δ, plant total dry weight, SLW and SPAD. Strong negative correlations were observed between TE and Δ (–0.52 to –0.76). Negative correlations between Δ and SLW or SPAD (–0.43 to –0.78) and smaller but significant positive correlations between TE and SLW or SPAD (0.23 to 0.30) suggested that photosynthetic capacity was, in part, underpinning the variation in TE. A cytoplasmic contribution to genetic variation in TE or Δ in canola was also observed with Triazine tolerant types having low TE and high Δ. This study showed that Δ has great potential for selecting canola germplasm with improved TE.

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Productivity, leaf traits and carbon isotope discrimination in 29 Populus deltoides × P. nigra clones

New Phytologist ◽

10.1111/j.1469-8137.2005.01407.x ◽

2005 ◽

Vol 167 (1) ◽

pp. 53-62 ◽

Cited By ~ 88

Author(s):

Romain Monclus ◽

Erwin Dreyer ◽

Francis M. Delmotte ◽

Marc Villar ◽

Didier Delay ◽

...

Keyword(s):

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Populus Deltoides ◽

Leaf Traits ◽

Isotope Discrimination

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Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites

Annals of Forest Science ◽

10.1051/forest:2008024 ◽

2008 ◽

Vol 65 (5) ◽

pp. 503-503 ◽

Cited By ~ 19

Author(s):

Ludovic Bonhomme ◽

Cécile Barbaroux ◽

Romain Monclus ◽

Domenico Morabito ◽

Alain Berthelot ◽

...

Keyword(s):

Genetic Variation ◽

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Leaf Traits ◽

Isotope Discrimination ◽

Hybrid Poplars

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Genetic variation in carbon isotope discrimination-based water use efficiency of teak (Tectona grandis L. f.) and its association with growth and wood quality traits

Trees ◽

10.1007/s00468-020-02078-4 ◽

2021 ◽

Author(s):

Vivek Vaishnav ◽

Pramod Kumar ◽

Pramod A. Shirke ◽

Tikam S. Rana

Keyword(s):

Genetic Variation ◽

Water Use Efficiency ◽

Carbon Isotope ◽

Water Use ◽

Carbon Isotope Discrimination ◽

Wood Quality ◽

Tectona Grandis ◽

Quality Traits ◽

Isotope Discrimination ◽

Use Efficiency

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Genetic variation in seedling water-use efficiency of Patagonian Cypress populations from contrasting precipitation regimes assessed through carbon isotope discrimination

Forest Systems ◽

10.5424/fs/2012212-02272 ◽

2012 ◽

Vol 21 (2) ◽

pp. 189 ◽

Cited By ~ 1

Author(s):

M. J. Pastorino ◽

A. G. Aparicio ◽

P. Marchelli ◽

L. A. Gallo

Keyword(s):

Genetic Variation ◽

Water Use Efficiency ◽

Carbon Isotope ◽

Water Use ◽

Carbon Isotope Discrimination ◽

Isotope Discrimination ◽

Precipitation Regimes ◽

Use Efficiency

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On the extent of genetic variation for transpiration efficiency in sorghum

Australian Journal of Agricultural Research ◽

10.1071/a96111 ◽

1997 ◽

Vol 48 (5) ◽

pp. 649 ◽

Cited By ~ 46

Author(s):

Graeme L. Hammer ◽

Graham D. Farquhar ◽

Ian J. Broad

Keyword(s):

Genetic Variation ◽

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Selection Index ◽

Leaf Tissue ◽

Transpiration Efficiency ◽

Significant Finding ◽

Physiological Basis ◽

Isotope Discrimination ◽

Accepted Standard

A glasshouse study examined 49 diverse sorghum lines for variation in transpiration efficiency. Three of the 49 lines grown were Sorghum spp. native to Australia; one was the major weed Johnson grass (Sorghum halepense), and the remaining 45 lines were cultivars of Sorghum bicolor. All plants were grown under non-limiting water and nutrient conditions using a semi-automatic pot watering system designed to facilitate accurate measurement of water use. Plants were harvested 56–58 days after sowing and dry weights of plant parts were determined. Transpiration efficiency differed signficantly among cultivars. The 3 Australian native sorghums had much lower transpiration efficiency than the other 46 cultivars, which ranged from 7·7 to 6·0 g/kg. For the 46 diverse cultivars, the ratio of range in transpiration efficiency to its l.s.d. was 2·0, which was similar to that found among more adapted cultivars in a previous study. This is a significant finding as it suggests that there is likely to be little pay-off from pursuing screening of unadapted material for increased variation in transpiration efficiency. It is necessary, however, also to examine absolute levels of transpiration efficiency to determine whether increased levels have been found. The cultivar with greatest transpiration efficiency in this study (IS9710) had a value 9% greater (P < 0·05) than the accepted standard for adapted sorghum cultivars. The potential impact of such an increase in transpiration efficiency warrants continued effort to capture it. Transpiration efficiency has been related theoretically and experimentally to the degree of carbon isotope discrimination in leaf tissue in sorghum, which thus offers a relatively simple selection index. In this study, the variation in transpiration efficiency was not related simply to carbon isotope discrimination. Significant associations of transpiration efficiency with ash content and indices of photosynthetic capacity were found. However, the associations were not strong. These results suggest that a simple screening technique could not be based on any of the measures or indices analysed in this study. A better understanding of the physiological basis of the observed genetic differences in transpiration efficiency may assist in developing reliable selection indices. It was concluded that the potential value of the improvement in transpiration efficiency over the accepted standard and the degree of genetic variation found warrant further study on this subject. It was suggested that screening for genetic variation under water-limiting conditions may provide useful insights and should be pursued.

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Genetic Variation in Carbon Isotope Discrimination and Its Relation to Stomatal Conductance in Pima Cotton (Gossypium barbadense)

Functional Plant Biology ◽

10.1071/pp9960127 ◽

1996 ◽

Vol 23 (2) ◽

pp. 127 ◽

Cited By ~ 14

Author(s):

Zhenmin Lu ◽

Jiwei Chen ◽

RG Percy ◽

MR Sharifi ◽

PW Rundel ◽

...

Keyword(s):

Genetic Variation ◽

Stomatal Conductance ◽

Heat Resistance ◽

Carbon Isotope ◽

Carbon Isotope Discrimination ◽

Stable Carbon Isotope ◽

Gossypium Barbadense ◽

High Irradiance ◽

Isotope Discrimination ◽

Selection For

Stable carbon isotope discrimination (Δ) was evaluated in primitive and cultivated Gossypium barbadense L. Significant differences among cultivated Pima lines were positively associated with the degree of selection for lint yield and heat resistance. A population mean study of a cross between B368, a primitive, uncultivated G. barbadense, and Pima S-6, an advanced line, showed that Δ is probably under genetic control, and could be a suitable selection trait in breeding programs. Eleven uncultivated accessions of primitive G. barbadense of varying origins grown in one environment showed a broad range of Δ values (18.8-20.50), pointing to substantial genetic variation of Δ in the G. barbadense germplasm. A was strongly correlated with stomatal conductance (gs) in the commercial lines, a segregating F2 population of the B368 × Pima S-6 cross, and the collection of uncultivated G. barbadense. This relationship indicates that variation in gs is the main source of variation for Δ in both uncultivated and commercial G. barbadense. The positive correlation between Δ, gs and yield in the commercial Pima lines provides further evidence for selection pressures on higher gs ensuing from selection for higher yield and heat resistance. Selection for higher Δ could increase yield in crops grown in hot, high irradiance, and well-irrigated environments.

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