Physiological adaptations of four dominant Caragana species in the desert region of the Inner Mongolia Plateau

Ma, Chunhua; Gao, Yubao; Guo, Hongyu; Wang, J.-L.; Wu, Jianbo; Xu, Jiao

doi:10.1016/j.jaridenv.2007.05.009

Cited by 47 publications

(45 citation statements)

References 22 publications

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“…Our result is in contrast to other studies that the seed production of herbaceous plants decreased as drought stress increased Gao, 2003, 2004;Harel et al, 2011). It is likely that C. stenophylla becomes more dominant from the semi-arid zone to the very arid zone because this shrub species is highly adapted to the arid climate (Ma et al, 2004a(Ma et al, , b, 2008Zhang et al, 2011) while many of its herbaceous competitors are comparatively sensitive to drought stress. The benefits of reduced interspecific competition might compensate for the negative effects of increased drought stress, high temperature and intense solar radiation.…”

Section: Effect Of Climatic Drought Stress On Seed Production Of C Scontrasting

confidence: 87%

Effects of grazing intensity on seed production of Caragana stenophylla along a climatic aridity gradient in the Inner Mongolia Steppe, China

et al. 2016

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As climatic aridity and grazing intensity increases, shrubs play an increasingly important role in grassland ecosystem functioning and services, and its abundance also generally increases. However, the effects of climatic aridity and grazing intensity on sexual reproduction of shrubs in grasslands remain largely unclear. In order to understand the effects of grazing intensity and climatic drought stress, and their interaction on seed production of shrub species, we examined the seed number, seed weight and seed yield of Caragana stenophylla under three grazing intensities (fenced, mild grazing and severe grazing) across a climatic aridity gradient (semi-arid, arid, very arid and intensively arid zones) in the Inner Mongolia Steppe, northern China during 2012-2013. The seed number, seed weight and seed yield gradually increased from the semi-arid to the very arid zones, but decreased from the very arid to the intensively arid zones in fenced plots. The seed number and seed yield decreased from the semi-arid to the intensively arid zones in mild and severe grazing treatment plots, therefore, grazing enhanced the suppression effect of climatic aridity on seed production of C. stenophylla. The seed number and seed yield gradually decreased as grazing intensity increased. The seed weight was highest in severe grazing plots, followed by the mild grazing plots and then the fenced plots. Precipitation varied interannually during the study period. We observed that the seed number, seed weight and seed yield were lower in the low precipitation year (2013) than in the high precipitation year (2012). As climatic drought stress increased, the negative effects of grazing on seed production of C. stenophylla also gradually increased. Our results indicated that climatic drought stress may contribute to the encroachment of C. stenophylla shrub in arid zones by promoting its seed production. However, grazing had negative effects on sexual reproduction of C. stenophylla, and the combined effects of drought stress and grazing seriously suppressed sexual reproduction of C. stenophylla in the intensively arid zone.

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Section: Effect Of Climatic Drought Stress On Seed Production Of C Scontrasting

confidence: 87%

Effects of grazing intensity on seed production of Caragana stenophylla along a climatic aridity gradient in the Inner Mongolia Steppe, China

et al. 2016

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“…C. fruticosa is an endangered (Qin et al 1993) endemic species in Heilongjiang Province (Liu 1955). Caragana species are cold-and drought-resistant and are well adapted to high temperature and strong solar radiation (Sanczir 2003;Ma et al 2008). Caragana forms nodules and fixes nitrogen with distinctive rhizobial populations (Lu et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Shoot multiplication and plant regeneration in Caragana fruticosa (Pall.) Besser

Zhai

Yang

Shen

2011

Journal of Forestry Research

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Different nutrient media can affect in vitro culturing protocols, and experimentation under varied growth conditions is valuable in plants where in vitro methods are in preliminary stages. We carried out the first in vitro propagation studies for the endangered species Caragana fruticosa (Fabaceae). We evaluated various nutrient media for their impact on shoot elongation and axillary bud proliferation using different concentrations of 6-benzylaminopurine (BA) and α-naphthaleneacetic acid (NAA). Shoot elongation was evaluated based on adventitious shoot primary culture and subculture regeneration from Caragana seedlings. Our goal was to improve both micropropagation and regeneration in C. fruticosa. MS nutrient media was superior to 1/2MS macronutrients, DKW, QL, and WPM for shoot elongation and axillary shoot proliferation. Shoots grown on 1/2MS and WPM exhibited some chlorosis, and shoots on QL produced larger leavers than plants growing on normal medium. The shoot proliferation coefficient on MS media supplemented with 2.22 µM BA and 0.44 µM BA + 2.69 µM NAA was significantly higher than that with other treatments in the primary culture. Shoots on 2.22 µM BA showed a higher proliferation coefficient (3.17) than others in the subculture. Shoots were rooted on 1/2MS medium with the addition of different concentrations of NAA. The optimal concentration for rooting was 0.27 µM NAA (74%). Roots exhibited many stout and long root hairs. Survivl of established plantlets was 82% at 30 days after transfer to soil. Plants established in the green house showed normal growth and displayed no apparent morphological differences compared to stock plants.

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“…Studies have found that plants growing under different climatic conditions can adapt to local climate and evolve genetically stable variation in morphological and physiological characteristics (Abd El Rahman and Krzywinski 2008;Zhang et al 2005). An extreme example is certain plant species in arid regions showing correspondingly small and thick leaves and extremely low transpiration rates (Ma et al 2008). Such morphological and physiological adaptation of plant ecotypes to local environment has been also found in hyperaccumulators, such as Zn hyperaccumulator S. alfredii (Yang et al 2010) and Pb/Cd/thallium (Tl) cohyperaccumulator Biscutella laevigata (Wierzbicka and Pielichowska 2004) s.…”

Section: Discussionmentioning

confidence: 98%

Role of transpiration in arsenic accumulation of hyperaccumulator Pteris vittata L.

Wan

Lei

Chen

et al. 2015

Environ Sci Pollut Res

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A b s t r a c t M e c h a n i s m s o f P t e r i s v i t t a t a L . t o hyperaccumulate arsenic (As), especially the efficient translocation of As from rhizoids to fronds, are not clear yet. The present study aims to investigate the role of transpiration in the accumulation of As from the aspects of transpiration regulation and ecotypic difference. Results showed that As accumulation of P. vittata increased proportionally with an increase in the As exposure concentration. Lowering the transpiration rate by 28∼67 % decreased the shoot As concentration by 19∼56 %. Comparison of As distribution under normal treatment and shade treatment indicated that transpiration determines the distribution pattern of As in pinnae. In terms of the ecotypic difference, the P. vittata ecotype from moister and warmer habitat had 40 % higher transpiration and correspondingly 40 % higher shoot As concentration than the ecotype from drier and cooler habitat. Results disclosed that transpiration is the main driver for P. vittata to accumulate and redistribute As in pinnae.

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Physiological adaptations of four dominant Caragana species in the desert region of the Inner Mongolia Plateau

Cited by 47 publications

References 22 publications

Effects of grazing intensity on seed production of Caragana stenophylla along a climatic aridity gradient in the Inner Mongolia Steppe, China

Effects of grazing intensity on seed production of Caragana stenophylla along a climatic aridity gradient in the Inner Mongolia Steppe, China

Shoot multiplication and plant regeneration in Caragana fruticosa (Pall.) Besser

Role of transpiration in arsenic accumulation of hyperaccumulator Pteris vittata L.

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