Influence of light, temperature, salinity and storage on seed germination of Haloxylon ammodendron

Huang, Zhenying; Zhang, Xinshi; Gang, Zheng; Gutterman, Yitzchak

doi:10.1016/s0140-1963(02)00294-x

Cited by 175 publications

(118 citation statements)

References 25 publications

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“…The low sensitivity of the Haloxylon spp. to the major environmental variables tested may due to the xeromorphic characteristics they have developed as a result of adaptation to drought, salinity, poor nutrition, strong wind, sand movement and high light intensity (Huang et al 2003). This adaptation is expressed in their reduced leaf size and photosynthesis function of the succulent branches.…”

Section: Discussionmentioning

confidence: 99%

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The vulnerability of native rangeland plant species to global climate change in the West Asia and North African regions

Belgacem

Louhaichi²

2013

Climatic Change

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This study aimed to evaluate the impact of climate change on the geographical distribution of selected native species from two areas from West Asia and North Africa. Three species representing two genera were selected for assessment of their vulnerability to climate change. The first species was Salsola vermiculata L. which is common to both study areas. The second genus was represented by two species, Haloxylon salicornicum (Moq.) Bunge from the Syrian rangelands and H. schmittianum Pomel from southern Tunisia. To assess the vulnerability of these species to climate change we used ecological-based models. The data inputs were composed of the species occurrence data and the environmental data which included eight climatic layers, three soil property layers in addition to an altitude layer. Since environmental parameters only enable assessing the sensitivity of target species to climate change, a grazing pressure layer was used to assess the species vulnerability. Only climatic parameters were considered as changing across three periods; current situation, 2020 and 2050. The main results indicated that threatened range species, such as S. vermiculata which were subjected to continuous grazing pressure, showed high vulnerability to climate change as expressed by the predicted decrease in the areas of their distribution. However, species with low palatability and broad ecological niches (i.e. H. salicornicum and H. schmittianum) had an advantage due to the reduced competition for water and nutrients. An adaptation strategy to increase the resilience of the most vulnerable species should involve management of grazing pressure and the establishment of other mitigation measures.

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Section: Discussionmentioning

confidence: 99%

“…Not only resistant to drought and high temperatures, Haloxylon spp. also tolerates salinity, and they are known as xero-halophytes (Huang et al 2003). They also constitute an indicator of desertification, since sites invaded by Haloxylon spp.…”

Section: Discussionmentioning

confidence: 99%

The vulnerability of native rangeland plant species to global climate change in the West Asia and North African regions

Belgacem

Louhaichi²

2013

Climatic Change

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“…The germination criterion was the emergence of the radical through the seed coat. Germination index (Gi) was calculated on the basis of germination percentage as: Gi = P Gt/Dt, where Gt is the percentage of seed germinated at 2 days intervals, and Dt is the number of germination days (Huang et al 2003). Seeds treated for 15 days were sampled for a determination of the biochemical parameters.…”

Section: Methodsmentioning

confidence: 99%

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

et al. 2009

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Germination of dragon spruce (Picea asperata Mast.) seeds pretreated with gibberellin (GA) in response to water stress and changes in the levels of osmotic adjustments as well as in activities of antioxidant enzymes were investigated. With decreasing water potential caused by increasing concentrations of PEG 6000, germination percentage and germination index decreased gradually; the decrease was especially prominent under the serious water stress from PEG -0.6 MPa. In contrast, osmotic regulation substances (free proline and soluble sugar contents), lipid peroxidation (MDA), and activities of antioxidant enzyme (ascorbate peroxidase, catalase, and peroxidase) increased markedly with decreased water potential. Similarly, the values in all parameters under -0.6 MPa PEG treatment were markedly higher than the control and -0.2 MPa PEG treatment. These results suggested that P. asperata seed germination was insensitive to water stress. In addition, seeds pretreated with GA had increased tolerance to water stress as measured by germination percentage and germination index, osmotic regulation substance, and antioxidant enzyme activities.

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“…Terminal shoots of H. ammondendron are modifi ed to green succulent cylindrical structures with stomata, which carry out the main photosynthetic function of the plant Kazantseva et al, 2012. Huang et al, 2003 .…”

Section: Measurement Of Leaf Scale Transpirationmentioning

confidence: 99%

Non-convergent transpiration and stomatal conductance response of a dominant desert species in central Asia to climate drivers at leaf, branch and whole plant scales

Wang

Mallik

2018

J. Agric. Meteorol.

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Desert ecosystems exposed to extreme droughts are vulnerable to climate change. Multi-scale mechanism of hydrological adaptation of desert plants to drought are not fully understood, creating uncertainty in risk assessment of desert ecosystems to climate change by ecological modelling. In this study, we investigated multi-scale water use strategies of Haloxylon ammodendron, a dominant desert shrub across central Asia. We found that whole plant water use of H. ammodendron was significantly reduced during most of the daytime period ca. 79 . At low light water use was controlled by photosynthetic photon flux density PPFD and at high vapour pressure deficit VPD it was further conserved by stomatal closure. It appears that water conservation in H. ammodendron at leaf-scale may behave differently with that at whole plant scale. High stomatal sensitivity to VPD at whole plant scale means more conservative water use strategy at plant scale than branch-and leaf-scale. Response of transpiration and stomata to climate drivers were non-convergent among leaf, branch and whole plant scales for this desert shrub. Therefore, one must be cautious in up scaling leaf-scale data to infer canopy scale water conservation to avoid overestimation of plant response to climate drivers. Nonetheless, our results enrich the database of multi-scale water use response of desert plants to climate drivers, which is critical for ecological modelling aiming to predict arid land vulnerability to climate change.

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Influence of light, temperature, salinity and storage on seed germination of Haloxylon ammodendron

Cited by 175 publications

References 25 publications

The vulnerability of native rangeland plant species to global climate change in the West Asia and North African regions

The vulnerability of native rangeland plant species to global climate change in the West Asia and North African regions

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

Non-convergent transpiration and stomatal conductance response of a dominant desert species in central Asia to climate drivers at leaf, branch and whole plant scales

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