Genetic diversity of drought-responsive genes in populations of the desert forage Dactylis glomerata

Trejo‐Calzada, Ricardo; O’Connell, Mary A.

doi:10.1016/j.plantsci.2005.01.010

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…As far as precipitation is concerned, according to the statistical data of 79 vascular plants, the precipitation and seasonal drought had important implications for the genetic diversity of vascular plants species (Tan et al, 2018). Although drought is a limiting factor for plant growth, after long-term adaptive evolution, plants in arid environments can developed different droughtresistant mechanisms (such as resistance genes) as well as genetic structures for adaptation to the environment (Ceccarelli and Grando, 1996;Ricardo-Trejo and O'Connell, 2005). The genetic variation and diversity of the populations in arid environments is predicted to increase as a consequence of drought stress, and the rate of evolution of plant populations in these environments is higher than that of the populations in humid environments (Stebbins, 1952).…”

Section: High Genetic Diversity Within Populations and Low Genetic DImentioning

confidence: 99%

Genetic Diversity of Phyllanthus emblica From Two Different Climate Type Areas

Liu

Wan

et al. 2020

Front. Plant Sci.

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Phyllanthus emblica L. is a well-known medicinal and edible plant species. Various medicinal compounds in the fruit make it an important medicinal and promising economic material. The plant is widely distributed in Southwestern and Southern China. However, due to massive deforestation and land reclamation as well as deterioration of its natural habitat in recent years, the wild resources of this species have been sharply reduced, and it is rare to see large-scale wild P. emblica forests so far. In order to effectively protect and rationally utilize this species, we investigated the genetic diversity, genetic structure, and population dynamics of 260 individuals from 10 populations of P. emblica sampled from the dry climate area in Yunnan and wet climate area in Guangxi using 20 polymorphic EST-SSR markers. We found high genetic diversity at the species level (He = 0.796) and within populations (He = 0.792), but low genetic differentiation among populations (FST = 0.084). In addition, most genetic variation existed within populations (92.44%) compared with variation among the populations (7.56%). Meanwhile, the NJ tree, STRUCTURE, and hierarchical analysis suggested that the sampled individuals were clustered into two distinct genetic groups. In contrast, the genetic diversity of the dry climate group (He = 0.786, Na = 11.790, I = 1.962) was higher than that of the wet climate group (He = 0.673, Na = 9.060, I = 1.555), which might be attributed to the combined effects of altitude, precipitation, and geographic distance. Interestingly, only altitude and precipitation had significant pure effects on the genetic diversity, and the former was slightly stronger. In addition, DIYABC analysis suggested the effective population size of P. emblica might have contracted in the beginning of the Last Glacial Maximum. These genetic features provided vital information for the conservation and sustainable development of genetic resources of P. emblica, and they also provided new insights and guidelines for ecological restoration and economic development in dry-hot valleys of Yunnan and karst areas in Guangxi.

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Section: High Genetic Diversity Within Populations and Low Genetic DImentioning

confidence: 99%

Genetic Diversity of Phyllanthus emblica From Two Different Climate Type Areas

Liu

Wan

et al. 2020

Front. Plant Sci.

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“…With climate change, it is expected that the main tea growing areas will experience an increase in the length of dry seasons per year, warmer temperatures and/or extreme rainfall intensity (Wijeratne, 1996;Trejo-Calzada and O'Connell, 2005;Eitzinger et al, 2011). Climate data collected at KALRO-TRI for over 58 years, indicate an annual temperature rise of 0.016 • C per year while annual rainfall decreased by 4.82 mm per year over the same period (Cheserek et al, 2015).…”

Section: Impact Of Climate Change On Tea Productionmentioning

confidence: 99%

Combating Climate Change in the Kenyan Tea Industry

et al. 2020

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Climate change triggered by global warming poses a major threat to agricultural systems globally. This phenomenon is characterized by emergence of pests and diseases, extreme weather events, such as prolonged drought, high intensity rains, hailstones and frosts, which are becoming more frequent ultimately impacting negatively to agricultural production including rain-fed tea cultivation. Kenya is predominantly an agricultural based economy, with the tea sector generating about 26% of the total export earnings and about 4% gross domestic product (GDP). In the recent years, however, the country has witnessed unstable trends in tea production associated with climate driven stresses. Toward mitigation and adaptation of climate change, multiple approaches for impact assessment, intensity prediction and adaptation have been advanced in the Kenyan tea sub-sector. Further, pressure on tea breeders to release improved climate-compatible cultivars for the rapidly deteriorating environment has resulted in the adoption of a multitargeted approach seeking to understand the complex molecular regulatory networks associated with biotic and abiotic stresses adaptation and tolerance in tea. Genetic modeling, a powerful tool that assists in breeding process, has also been adopted for selection of tea cultivars for optimal performance under varying climatic conditions. A range of physiological and biochemical responses known to counteract the effects of environmental stresses in most plants that include lowering the rates of cellular growth and net photosynthesis, stomatal closure, and the accumulation of organic solutes such as sugar alcohols, or osmolytes have been used to support breeding programs through screening of new tea cultivars suitable for changing environment. This review describes simulation models combined with high resolution climate change scenarios required to quantify the relative importance of climate change on tea production. In addition, both biodiversity and ecosystem based approaches are described as a part of an overall adaptation strategy to mitigate adverse effects of climate change on tea in Kenya and gaps highlighted for urgent investigations.

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“…ventricosa in Cyprus, biological stages that are highly important in terms of adaptability and survival. It seems that after long-term exposure to the adverse environments, flora that grow under these conditions develop adaptive mechanisms and thus increasing sub-differentiation and genetic diversity [ 28 ]. Furthermore, significant relationships among genetic and environmental discrepancies might arise once habitat variation acts as an obstacle to gene flow, causing environmental remoteness and genetic variation, even when populations are spatially close [ 29 ], as it is the case in the present study.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity of Avena ventricosa populations along an ecogeographical transect in Cyprus is correlated to environmental variables

et al. 2018

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Avena ventricosa Balansa ex Coss. is considered the C-genome donor of the cultivated hexaploid oat and is a ‘priority’ species for conservation, since it has limited geographic distribution and the only recorded populations in Europe are present in Cyprus. The current study attempts to characterize the genetic structure and fragmentation of the species via the application of genotypic markers. It was revealed that the genetic variety was mainly allocated among the populations collected, since clustering obtained was according to the geographic origin of the samples and the habitat. Species distribution modeling showed that the most important climatic variable defining A. ventricosa distribution is the mean diurnal temperature. Furthermore, significant association of the genetic structure to environmental variables was detected; overall, a negative association to precipitation was confirmed, while significant correlations of genetic structure and the temperature at the time of anthesis and germination were established. The safeguarding of this valuable genetic resource is discussed.

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Genetic diversity of drought-responsive genes in populations of the desert forage Dactylis glomerata

Cited by 11 publications

References 24 publications

Genetic Diversity of Phyllanthus emblica From Two Different Climate Type Areas

Genetic Diversity of Phyllanthus emblica From Two Different Climate Type Areas

Combating Climate Change in the Kenyan Tea Industry

Genetic diversity of Avena ventricosa populations along an ecogeographical transect in Cyprus is correlated to environmental variables

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