Drought tolerance acquisition in Eucalyptus globulus (Labill.): A research on plant morphology, physiology and proteomics

2013 ◽  
Vol 79 ◽  
pp. 263-276 ◽  
Author(s):  
Ana Elisa Valdés ◽  
Sami Irar ◽  
Juan P. Majada ◽  
Ana Rodríguez ◽  
Belén Fernández ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Eucalyptus Globulus ◽  
Plant Morphology

Intraspecific variation in drought susceptibility in Eucalyptus globulus is linked to differences in leaf vulnerability

2019 ◽  
Vol 46 (3) ◽  
pp. 286 ◽  
Author(s):  
Christopher J. Lucani ◽  
Timothy J. Brodribb ◽  
Greg Jordan ◽  
Patrick J. Mitchell
Keyword(s):  
Drought Tolerance ◽  
Intraspecific Variation ◽  
Eucalyptus Globulus ◽  
Forest Tree ◽  
Species Variation ◽  
Important Species ◽  
Phenotypic Differences ◽  
Hydraulic Failure ◽  
Xylem Vulnerability ◽  
Alternative Approach

Understanding intraspecific variation in the vulnerability of the xylem to hydraulic failure during drought is critical in predicting the response of forest tree species to climate change. However, few studies have assessed intraspecific variation in this trait, and a likely limitation is the large number of measurements required to generate the standard ‘vulnerability curve’ used to assess hydraulic failure. Here we explore an alternative approach that requires fewer measurements, and assess within species variation in leaf xylem vulnerability in Eucalyptus globulus Labill., an ecologically and economically important species with known genetic variation in drought tolerance. Using this approach we demonstrate significant phenotypic differences and evidence of plasticity among two provenances with contrasting drought tolerance.

scholarly journals 1006 OVERVIEW OF GENE AVAILABILITY, IDENTIFICATION AND REGULATION

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 573f-573
Author(s):  
Lowell D. Owens
Keyword(s):  
Drought Tolerance ◽  
Gene Product ◽  
Current Knowledge ◽  
Starch Synthesis ◽  
Plant Morphology ◽  
Flower Color ◽  
Plant Viruses ◽  
Considerable Extent ◽  
Sucrose Transport

A growing number of horticulturally useful genes have been introduced into plants. Most are designed to impart resistance to pests, but others affect plant morphology, cold or drought tolerance, sucrose transport, starch synthesis, flower color or fruit ripening. Although most of the genes introduced were originally cloned from plants or plant viruses, some were cloned from bacteria or animals. Identification of gene function has generally involved characterization of the gene product prior to cloning the gene. Recent advances in genetic mapping, however, have opened new approaches to cloning genes prior to isolation of the gene product or to an understanding of the biology of the trait conferred. Most candidate genes for introduction need to be modified to achieve the intended purpose. Rational modification is now possible, to a considerable extent, based upon current knowledge of gene structure and regulation. Some guidlines for modification and examples thereof will be examined.

scholarly journals Responses to water stress in two Eucalyptus globulus clones differing in drought tolerance

2004 ◽  
Vol 24 (10) ◽  
pp. 1165-1172 ◽  
Author(s):  
F. C. e Silva ◽  
A. Shvaleva ◽  
J. P. Maroco ◽  
M. H. Almeida ◽  
M. M. Chaves ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
Eucalyptus Globulus

scholarly journals Investigation on Various Aboveground Traits to Identify Drought Tolerance in Cowpea Seedlings

HortScience ◽  
2018 ◽  
Vol 53 (12) ◽  
pp. 1757-1765 ◽  
Author(s):  
Waltram Ravelombola ◽  
Ainong Shi ◽  
Jun Qin ◽  
Yuejin Weng ◽  
Gehendra Bhattarai ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Vegetative Growth ◽  
Root Architecture ◽  
Crop Production ◽  
Plant Morphology ◽  
Delayed Senescence ◽  
Cowpea Cultivars ◽  
Genetic Mechanisms ◽  
Effects Of Drought

Impacts of drought stress on crop production can significantly impair farmer’s revenue, hence adversely impacting the gross national product growth. For cowpea [Vigna unguiculata (L.) Walp.], which is a legume of economic importance, effects of drought at early vegetative growth could lead to substantial yield losses. However, little has been done with respect to breeding for cowpea cultivars withstanding drought at early vegetative growth. In addition, previous investigations have focused on how plant morphology and root architecture can confer drought tolerance in cowpea, which is not sufficient in efforts to unravel unknown drought tolerance–related genetic mechanisms, potentially of great importance in breeding, and not pertaining to either plant morphology or root architecture. Therefore, the objective of this study was to evaluate aboveground drought-related traits of cowpea genotypes at seedling stage. A total of 30 cowpea genotypes were greenhouse grown within boxes and the experimental design was completely randomized with three replicates. Drought stress was imposed for 28 days. Data on a total of 17 aboveground-related traits were collected. Results showed the following: 1) a large variation in these traits was found among the genotypes; 2) more trifoliate wilt/chlorosis tolerance but more unifoliate wilt/chlorosis susceptible were observed; 3) delayed senescence was related to the ability of maintaining a balanced chlorophyll content in both unifoliate and trifoliate leaves; and 4) the genotypes PI293469, PI349674, and PI293568 were found to be slow wilting and drought tolerant. These results could contribute to advancing breeding programs for drought tolerance in cowpea.

Prebleaching of eucalypt kraft pulp with OP stages: Effect of an acid pretreatment or chelation step

TAPPI Journal ◽  
2012 ◽  
Vol 11 (6) ◽  
pp. 31-38
Author(s):  
TATIANA M. PÓVOAS ◽  
DINA A.G. ANGÉLICO ◽  
ANA P.V. EGAS ◽  
PEDRO E.G. LOUREIRO ◽  
LICÍNIO M. GANDO-FERREIRA ◽  
...  
Keyword(s):  
Eucalyptus Globulus ◽  
Comparative Evaluation ◽  
Kraft Pulp ◽  
Kraft Pulps ◽  
Acid Pretreatment ◽  
High Brightness ◽  
Pulp Viscosity ◽  
Brightness Reversion

We conducted a comparative evaluation of different treatments for the bleaching of eucalypt kraft pulps beginning with OP stages. The treatments tested were (1) an acid chelation stage with DTPA (OQP sequence); (2) a hot acid stage (AOP sequence); and (3) a chelant addition into the alkaline oxygen stage ((OQ)P and A(OQ)P sequences). The latter strategy was also studied for environmental reasons, as it contributes to the closure of the filtrate cycle. The OQP sequence leads to the highest brightness gain and pulp viscosity and the lowest peroxide consumption caused by an efficient metals control. Considering that the low biodegradability of the chelant is a problem, the A(OQ)P sequence is an interesting option because it leads to reduced peroxide consumption (excluding OQP) while still reaching high brightness values and similar brightness reversion to OQP prebleaching, with only a viscosity loss of 160 dm3/kg. Therefore, a hot acid stage could be considered when a separate acid Q stage is absent in a prebleaching sequence of Eucalyptus globulus kraft pulps involving OP stages.

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