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Comparison of anatomical structure and photosynthetic characteristics between the two photosynthetic organs of the desert plant Hedysarum scoparium

QiaoDi Yan,PeiXi Su,Song Gao,

寒旱区科学 , 2010,
Abstract: The desert plant Hedysarum scoparium uses leaflets and rachises as its photosynthetic organs. The abundance of leaflets was lower under unfavorable environmental conditions and higher with improved water conditions. To examine the characteristics associated with the adaptation of H. scoparium to its environment, we selected plants with both compound leaves and rachis without leaflets to study the anatomical structures and gas exchange characteristics of the two organs. The results show that the water storage tissues in rachises were more developed compared with the leaflets. The diurnal courses of the net photosynthetic rate for the rachis and the leaflet were both in a bimodal pattern. Meanwhile, both two peak values of the rachis were significantly higher than those of the leaflet. The daily average transpiration rate was significantly higher in the rachis than in the leaflet in order to lower the temperature of the rachises. It was concluded that under desert drought conditions, the leaflets of H. scoparium were partially or completely degraded to reduce the transpiration area as an adaptive response to water deficit, and only the rachises were retained as photosynthetic organ. The rachises were found to be better suited to a desert habitat than the leaflets.
Transpiration of Hedysarum scoparium in arid desert region of Shiyang River basin, Gansu Province

XIA Gui-min,KANG Shao-zhong,DU Tai-sheng,YANG Xiu-ying,ZHANG Ji,

应用生态学报 , 2007,
Abstract: By using heat pulse technique, an investigation on the transpiration of Hedysarum scoparium was conducted in the arid desert region of Shiyang River basin, Gansu Province. The results indicated that with increasing inserted depth of probe, the sap flow velocity in H. scoparium xylem had a trend from high to low. In the taproot with smaller diameter, the average sap flow velocity at different positions was faster, and the change range was bigger. Among the taproots with different diameters, there existed a larger difference in the magnitude of sap flux, but the change trend was similar, i.e., smaller at nighttime and larger at daytime, and showing a multi-peak curve. A linear correlation was observed between the diurnal sap flux and the reference crop evapotranspiration, and the transpiration mainly occurred during the period from June to September, occupying 79.04% of the total annual transpiration. The diurnal sap flux of H. scoparium at its later growth period had significant correlation with the moisture content in 0-50 cm sand layer, but no correlations with that in other sand layers. The effects of main meteorological factors on the sap flux of H. scoparium were in the sequence of air temperature> vapor pressure difference> wind speed.
Allelopathy Effects of Salix cheilophila on Hedysarum scoparium and Caragana korshinskii in Mu Us Desert

- , 2015, DOI: doi:10.3969/j.issn.1001-7461.2015.04.06
Abstract: 通过生物测定方法,研究了毛乌素沙地的沙柳(Salix cheilophila)枝叶浸提液对2种豆科植物花棒(Hedysarum scoparium)、柠条(Caragana korshinskii)的种子萌发与幼苗生长的化感作用。结果表明,沙柳可以抑制2种受体种子萌发和幼苗生长,花棒的各项指标在随着浸提液浓度升高时抑制作用逐渐减小,柠条的各项指标随着浸提液浓度增加抑制作用逐渐增大。花棒幼苗的地上部分比地下部分敏感,柠条幼苗的地下部分比地上部分敏感。沙柳对花棒和柠条的叶绿素含量指标表现为明显的抑制作用;对柠条根系活力指标表现为明显的抑制作用。因此,对根系和光合系统的破坏可能反映了沙柳化感作用的主要方式。
Allelopathy effects of the branch-leaf aqueous extract of Salix cheilophila on the seed germination and seedling growth of Hedysarum scoparium and Caragana korshinskii were investigated by bio-assay method. The results showed that the extract exhibited inhibitory effects on seed germination and growth of the two Leguminous plants. And the inhibitory effects to H. scoparium decreased alone with the increase of the concentration of the extract, in contrast, the germination index of C. korshinskii decreased alone with the concentration of the extract. The aerial parts of H. scoparium seedlings were more sensitive than the underground parts, while C. korshinskii underground parts were more sensitive than the aerial parts. The extract showed a sensitive inhibitory effect on chlorophyll content of H. scoparium and C. korshinskii and significant inhibition on C. korshinskii root activity. By inference, damage to the roots and the photosynthetic system may be reflected the allelopathy effect of S. cheilophila
Tree-scale transpiration dynamics of Hedysarum scoparium in response to growth stage, groundwater table depth, and climate in a semi-arid environment in northwestern China

ZHANG Zhiqiang,WANG Shengping,JIA Baoquan,ZHAO Ming,E Klaghofer,
,王盛萍,贾宝全,赵明,E. Klaghofer

生态学报 , 2004,
Abstract: Natural precipitation is often limited and groundwater can be a very important water source for vegetation reestablishment and growth in the dryland regions. Therefore, quantifying water use by plant transpiration under different ground water tables helps to understand responsive mechanism of plant growth to various ground water regimes. One year-old seedlings of Hedysarum scoparium were planted in 1995 and single tree transpiration dynamics under constant water tables of 1.6 m, 2.6 m, and 3.6 m were measur...
Lüttge, Ulrich;Scarano, Fabio R.;
Brazilian Journal of Botany , 2004, DOI: 10.1590/S0100-84042004000100001
Abstract: an attempt to delineate rather than to precisely define what we mean by "ecophysiology" is based on a brief historical overview of what eventually led to development of instrumentation and sampling strategies for analyses that allow description of physiological performance in the field. these techniques are surveyed. ecophysiology originally is aut-ecology dedicated to the behaviour of individual plants, species or higher taxa, viz. "physiotypes", in particular habitats. examples of ecophysiological diversity are developed, which illustrate gradual merging with more integrative considerations of functions and dynamics of habitats or ecosystems, i.e. a trend of research towards physiological syn-ecology. the latter is exemplified by studies with comparisons of a variety of morphotypes and physiotypes within a given habitat or ecosystem and across a range of habitats or ecosystems. the high demand and complexity as well as the excitement of ecology and ecophysiology arise from the quest to cover all conditions of the existence of organisms according to ernst haeckel's original definition of "ecology".
7种沙生灌木饲用营养成分评定  [PDF]
- , 2015, DOI: 10.13360/j.issn.1000-8101.2015.05.034
Abstract: 为了在宁夏干旱风沙区植被恢复模式及适应性管理技术研究中筛选节水耐旱、经济高效的优良适生植物,选用宁夏盐池干旱风沙区7种沙生灌木树种(沙木蓼、沙柳、红柳、杨柴、柠条、紫穗槐、花棒)的叶片为试验材料,测定其饲用养分指标,并对饲用营养价值进行综合评定,为干旱风沙区退化植被恢复中植被的筛选提供依据。结果表明:7种沙生灌木中除红柳外,其他6种树种的粗蛋白含量均最高,达到了优质谷类粮食蛋白含量(小麦13.3%,大米13.5%)的水平。其中柠条的中性、酸性洗涤纤维含量低,紫穗槐的钙磷比达到了饲用营养标准。因此,柠条和紫穗槐的饲用营养价值相对较高。
In order to select water??saving, drought??esistant, economically efficient and suitable vegetation for restoration mode and adaptive management technique in dry and sandy region in Ningxia, leaves of the seven shrub species(Atraphaxis frutescens, Salix psammophila,Tamarix ramosissima,Hedysarum mongolicum Turcz.,Caragana korshinskii Kom.,Amorpha fruticosa,Hedysarum scoparium Fisch.)were selected as the study materials in dry and sand. Their grazing values were analyzed and evaluated by measuring the nutrition of the leaves. The results showed that crude protein content of all species except T. ramosissima were up to the high quality food grain protein content (13.3% of wheat, 13.5% of rice). NDF and ADF of C. korshinskii Kom. were low, Ca/P of A. fruticosa achieved forage nutrition standard. The grazing nutrition of C. korshinskii Kom. and A. fruticosa were relatively high
Ecophysiology of Desert Arthropods and Reptiles
Sue Nicolson
African Zoology , 2012,
Abstract: This is the second book of a Springer series on the adaptations of desert organisms (the first was R.T. Wilson's Ecophysiology of the Camelidal! and Desert Ruminants in 1989). It is entirely appropriate to deal with arthropods and reptiles together: both are in a sense pre-adapted to desert living because they possess relatively waterproof integuments, excrete insoluble nitrogenous waste, are ectotherms with low metabolic rates, and are small enough to escape from enviromnental extremes. Both groups are highly successful in deserts throughout the world, and desert lizards in particular have had a major influence on the discipline of ecophysiology.
Ecophysiology of tropical tree crops: an introduction
DaMatta, Fábio M.;
Brazilian Journal of Plant Physiology , 2007, DOI: 10.1590/S1677-04202007000400001
Abstract: in this special issue, ecophysiology of major tropical tree crops, considered here on a broader sense and including species such as banana, cashew, cassava, citrus, cocoa, coconut, coffee, mango, papaya, rubber, and tea, are examined. for most of these crops, photosynthesis is treated as a central process affecting growth and crop performance. the crop physiological responses to environmental factors such as water availability and temperature are highlighted. several gaps in our database concerning ecophysiology of tropical tree crops are indicated, major advances are examined, and needs of further researches are delineated.
The novelties in diagnostic of redlist plants from the genus Hedysarum  [PDF]
Irina Popova,Tamara Plaksina,Vitaly Ryzhov,Lubov Tarasenko
Modern Phytomorphology , 2013,
Abstract: Plant of the genus HedysarumL (Fabaceae) are the source of valuable medicinal substances. Effective diagnostic of wild species promising as a source of medicinal substances has a key value. The anatomy (histological features) of the rachis of compound leaves of redlist species Hedysarum razoumovianumDC. and H. grandiflorumPall. collected Kinelskiy near Samara region (Cretaceous Kinelskoye spring) in June 2009 have been investigated. These investigations on petiolar anatomy confirm, clarify and support the data on anatomical and histological structure of studied species. Comparative analysis revealed structural features that may be serve further as diagnostic.
Isolation, morphological identification and pathogenicity of Cylindrocladium scoparium and C. clavatum isolates obtained from plants rhizosphere cultivated in Pernambuco State
Rehn, Vitorina Nerivania Covello;Menezes, Maria;Rehn, Kurt Georg;Coêlho, Rildo Sartori Barbosa;
Brazilian Journal of Microbiology , 2004, DOI: 10.1590/S1517-83822004000300004
Abstract: twelve isolates of cylindrocladium scoparium and 4 isolates of c. clavatum were obtained from the rhizosphere of various species of plants by baiting with ricinus communis leaves. the isolates of c. scoparium developed conidia of 32-(45)-60 x 3 -(4)-5 μm, and pyriform to ellipsoidal vesicles. c. clavatum showed conidia of 36-(44)-49 x 2-(4)-6 μm and clavate vesicles. all isolates induced necrosis on leaves and hypocotyls of eucalypt seedlings, with varying expression of symptoms.
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