Carbon isotope discrimination and differential drought tolerance in eucalypt clones

Nunes, Flancer Novais; Barros, Nairam Félix de; Novais, Roberto Ferrera de; Silva, Ivo Ribeiro da; Stape, José Luiz

doi:10.18671/scifor.v44n112.11

Cited by 5 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The largest reductions in growth and photosynthetic rate observed for clone i042 reinforce the classification of its susceptibility to water deficit and drought under field conditions (Nunes et al 2016). It is noteworthy that although clones i042, vc865 and i182 were in closed groups by multivariate analysis, the last genotype was moder-ately drought-tolerant in the field.…”

Section: Genotype Growth and Classificationsupporting

confidence: 67%

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

Müller¹,

Hodecker²,

Barros³

et al. 2020

iForest

View full text Add to dashboard Cite

Biogeosciences and Forestry Biogeosciences and Forestry A physiological approach for pre-selection of Eucalyptus clones resistant to drought Caroline Müller (1-2) , Bárbara Elias Reis Hodecker (1-2) , Nairam Félix De Barros (1) , Andrew Merchant (2) Water deficit is one of the abiotic stresses that most affects the growth and survival of Eucalyptus. Mechanisms used to tolerate water-limited environments influence the distribution of Eucalyptus species in their natural environment. Here, we take a physiological approach to pre-screen Eucalyptus plants for tolerance to drought. Ten different clones of E. urophylla and E. grandis × E. urophylla that are known to show contrasting responses to water deficit under field conditions, were grown in Clark's nutrient solution (WW, well-watered) and with polyethylene glycol (-1.0 MPa) to simulate water deficit (WD). Clones responded differently to drought with differentiated photosynthetic limitations in drought-treated clones. Photosynthetic rates, stomatal conductance, transpiration and internal CO2 concentrations were reduced in all genotypes under stress conditions. Clone i144 had a smaller reduction in the evaluated physiological traits, also showing increased root growth in WDtreated plants. Clones 3367 and i224, thought to be moderately tolerant, also followed these patterns. Clones gg157, 1568 and 1641, all of which are moderately sensitive under field conditions, reduced most of the physiological characters evaluated. However, clone gg157 demonstrated increased root system growth, even during short periods of water stress. Clones i042 and i182 were deemed drought-susceptible, with large reductions in photosynthesis and growth, despite showing a high increase in abscisic acid content presumably as a defense mechanism. Interaction between A (photosyntetic rate), E (transpiration rate), ETR/A (electrons transport rate/photosynthetic rate) and SDM/ RDM (shoot dry matter/root dry matter) demonstrated the most significant differences between WD-treated clones and offer great potential for use as selection criterion for water deficit-tolerant genotypes.

show abstract

Section: Genotype Growth and Classificationsupporting

confidence: 67%

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

Müller¹,

Hodecker²,

Barros³

et al. 2020

iForest

View full text Add to dashboard Cite

show abstract

“…Solanum tuberosum (Vos and Groenwold, 1989), Helianthus annuus (Adiredjo et al, 2014b, Adiredjo et al, 2014a, Populus spp. ( Monclus et al, 2006, Maier et al, 2019, Eucalyptus spp (Nunes et al, 2016, Pitaa et al, 2001, Li, 1999) , Coffea canephora (DaMatta et al, 2003; Coffea arabica (Meinzer et al, 1992, Meinzer et al, 1991. The finding in this thesis that δ 13 C abundances are linked to WUE at leaf level in both ample and restricted-water conditions and WUE at plant level under ample water conditions contributes to the available knowledge by identifying the potential of using carbon isotope signatures as a probable tool for selecting WUEi genotypes within of C. canephora including wild genotypes.…”

Section: Implication Of the Findings In The Perceptive Of Field Applicationsmentioning

confidence: 69%

Genetic diversity and phenotypic variation of wild, feral and cultivated Coffea canephora in relation to drought stress

Kiwuka

View full text Add to dashboard Cite

Catherine Kiwuka (2020). Genetic diversity and phenotypic variation of wild, feral and cultivated Coffea canephora in relation to drought stress. PhD thesis, Wageningen University, The Netherlands, with summaries in English and Dutch, 180 pp.Coffea canephora Pierre ex A. Froehner (Robusta coffee) is an important crop sustaining millions of livelihoods in its production zone which is predominated by poor countries. Like the other commercially important coffee species, Coffea arabica, the production of Coffea canephora is threatened by the prevailing intense and frequent drought spells reported to be increasing in relation to climate change. There is thus an urgent need to develop drought resilient C. canephora cultivars especially for poor farmers who often lack irrigation options.Availability of C. canephora intraspecific diversity and occurrence of wild populations across an environmental gradient may indicate presence of valuable genetic material, which could be used directly as a new variety or as a parent in breeding climate resilient varieties. This thesis explored: (i) the genetic diversity of Ugandan Robusta coffee; (ii) linkages between allelic variation and environmental variables; (iii) phenotypic variation in drought tolerance and (iv) phenotypic plasticity to shifts in water availability and its relationship with drought tolerance.Results showed that: Uganda's C. canephora differentiates into five geographically delimited groups, and there is substantial phenotypic variation in relation to their response to water availability across locations and genetic groups but no significant phenotypic variation along the level of cultivation status. We observed a trade-off between drought tolerance and growth in ample water conditions. Drought tolerance of the genotypes was negatively associated to an index that indicated wetness of the climate at their locations suggesting some degree of local adaptation. Finally, our results also showed a negative correlation between plasticity in response to changes in water availability and drought tolerance. Generally, our study revealed the comprehensive genetic structure of Uganda's C. canephora, its differential response in to drought stress, growth-tolerance trade-off, plasticity-tolerance trade-off, the link between δ 13 C discrimination and water-use efficiency, and the probable implications of the findings to developing drought tolerant cultivars. Our findings can be used in further studies like association studies to identify putatively adapted genotypes and in breeding programs to develop climate resilient cultivars. Table of contents Chapter General introduction 1 Chapter Genetic diversity of native and cultivated Uganda's Coffea canephora 19 Pierre ex A. Froehner. A perspective into potential utilization and conservation of the diversity Chapter Intraspecific variation in growth response to drought stress across 51 geographic locations and genetic groups in Coffea canephora Pierre ex A. Froehner Chapter Phenotypic and genotypic variation in trait plastic response...

show abstract

“…Of these, clones i042 and i144 were confirmed, respectively, as drought-sensitive and tolerant in the field (Barros Filho, 2014;Nunes et al, 2016), and used as a reference for comparison with other genotypes in this study. Eucalyptus seedlings were grown in a greenhouse in plastic pots (8 L) containing intermittently aerated Clark's nutrient solution (Clark, 1975), adapted by Locatelli et al (1984) The pH (5.5) was adjusted every 2 days with NaOH or HCl.…”

Section: Plant Materials and Experimental Conditionsmentioning

confidence: 99%

Nutritional Efficiency of Eucalyptus Clones Under Water Stress

Müller

Hodecker

Merchant

et al. 2017

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Plant health and nutrition are strongly influenced by the availability of water. The objective of this study was to evaluate the different patterns of initial growth and nutritional efficiency of ten drought-stressed Eucalyptus clones. Water stress conditions were induced by osmotic stress, by gradual addition of polyethylene glycol 6000 over a 20-day period. Drought stress significantly reduced the dry matter of leaves, roots, and the whole plant as well as the nutritional efficiency of most clones. Clone PL040 was the least efficient in nutrient uptake and use and the most sensitive to drought stress. Interestingly, under drought stress, the drought-tolerant clones generally had high AE (absorption efficiency), but low nutrient UE (use efficiency), whereas the sensitive clones had low AE and low UE for root formation and high AE for leaf formation. In a combined evaluation of growth and nutrient use efficiency, the clones vc865, i182, i144, and gg157 were grouped as drought-tolerant; 1528 and i224 as moderately tolerant; and 1641, 3367, i042, and PL040 as drought-sensitive.

show abstract

Carbon isotope discrimination and differential drought tolerance in eucalypt clones

Cited by 5 publications

References 24 publications

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

Genetic diversity and phenotypic variation of wild, feral and cultivated Coffea canephora in relation to drought stress

Nutritional Efficiency of Eucalyptus Clones Under Water Stress

Contact Info

Product

Resources

About