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'Abscisic Acid' in keywords
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2001 (1)
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1Author    BlahoslavM. Aršálek, Helena Zahradníčková, MarieH. RonkováRequires cookie*
 Title    Extracellular Production of Abscisic Acid by Soil Algae under Salt, Acid or Drought Stress  
 Abstract    The com m on soil green algae Chlorella vulgaris and Stichococcus hacillaris increase extra­ cellular abscisic acid (A BA) production under salt, acid or drought stress 5 -1 0 times. Produc­ tion o f A BA also increases from young to senescent cultures 2 -3 times. The relationship between age o f cultures and reaction to stress factors was found. Extra­ cellular A BA levels are 1 -2 times higher than cellular ones. Possible influence o f ABA to soil microbial associations, growth o f plants and soil fauna is discussed from an ecological point o f view. 
  Reference    Z. Naturforsch. 47c, 701 (1992); received June 10/July 21 1992 
  Published    1992 
  Keywords    Algae, Abscisic Acid, Extracellular Production, Stress Factors 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0701.pdf 
 Identifier    ZNC-1992-47c-0701 
 Volume    47 
2Author    Yuki Ogura, Atsushi Ishihara, Hajime IwamuraRequires cookie*
 Title    Induction of Hydroxycinnamic Acid Amides and Tryptophan by Jasmonic Acid, Abscisic Acid and Osmotic Stress in Barley Leaves  
 Abstract    The effects of jasmonic acid (JA) and abscisic aid (ABA) on secondary metabolism in barley (Hordeum vulgare L.) were investigated. Treatment with JA at 100 |j,m for 48 h induced accumulation of four compounds in barley primary leaves. The accumulation of these com­ pounds was also observed after treatm ent with ABA at 100 ^m. The induced compounds were identified as p-coumaroylputrescine, p-coumaroylagmatine, p-coumaroyl-3-hydroxyagmatine and tryptophan by spectroscopic methods. The profiles of compounds induced by application of JA and ABA were different. JA exhibited stronger inducing activity for hydroxycinnamic acid amides than ABA, while ABA was more active in tryptophan accumulation. The major hydroxycinnamic acid amides in JA-and A BA-treated leaves were p-coumaroylagmatine and p-coumaroyl-3-hydroxyagmatine, respectively. These differences suggested that JA and ABA act in distinct modes. The induction of these compounds was also observed in leaf segments treated with 1 m sorbitol and glucose. These findings suggested that JA and ABA are involved in accumulation of hydroxycinnamic acid amides and tryptophan in response to osmotic stress in barley. 
  Reference    Z. Naturforsch. 56c, 193—202 (2001); received O ctober 19/December 11 2000 
  Published    2001 
  Keywords    Jasmonic Acid, Abscisic Acid, Hydroxycinnamic Acid Amide 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0193.pdf 
 Identifier    ZNC-2001-56c-0193 
 Volume    56 
3Author    Karl Dörffling, Wolfgang Petersen, Ewald Sprecher, Irene Urbasch, Hans-Peter HanssenRequires cookie*
 Title      
 Abstract    Strains o f the phytopathogenic species Botrytis cinerea, Ceratocystis coerulescens, C.fim briata, Fusarium oxy­ sporum, and Rhizoctonia solani were cultivated on a d e­ fined synthetic culture medium. The plant horm one abscisic acid (ABA) was identified by gas chrom ato­ graphy/mass spectrometry and gas chromatography data, and the contents determined in m ycelia (1 5 .9 -3 1 .9 n g/g mycel) and culture media (1 .0 -4 .6 ng/m l) by scintillation counting. 
  Reference    Z. Naturforsch. 39c, 683 (1984); received March 14 1983 
  Published    1984 
  Keywords    Ceratocystisßmbriata, Fusarium oxysporum, Rhizoctonia solani, Phytopathogenic Fungi, Abscisic Acid 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0683_n.pdf 
 Identifier    ZNC-1984-39c-0683_n 
 Volume    39 
4Author    Wolfram Hartung, Barbara DierichRequires cookie*
 Title    Uptake and Release of Abscisic Acid by Runner Bean Root Tip Segments  
 Abstract    Uptake o f abscisic acid by 5 mm long decapped root tips is a linear function o f the external ABA concentration in the range o f 2.9 x 10-8 m to 10~4 m and decreases dramatically with in­ creasing pH. At pH 8.0 uptake rate is extremely low, even at high ABA concentrations. This indicated that nearly all o f the ABA is taken up as the undissociated m olecule ABAH. Uptake o f ABA is influenced by agents m odifying the pH gradients between the m edium and the tissue such as salts o f weak acids incubated at low external pH (inhibition o f uptake and stim ulation o f ABA release by abolishing the pH gradients), protonophores such as CCCP (inhibition o f uptake) and fusicoccin (stim ulation o f uptake by increasing the pH between m edium and cytoplasm). It is concluded that ABA distributes between the compartments o f the root cells according to the pH gradients with the undissociated m olecule as the only penetrating species. Uptake and release occur without participation o f a saturable com ponent by diffusion. In contrast IAA permeates the plasm alem m a as both IAAH and IAA-. 
  Reference    Z. Naturforsch. 38c, 719 (1983); received March 31 1983 
  Published    1983 
  Keywords    Abscisic Acid, Diffusion, Indole Acetic Acid, Phaseolus coccineus, Plasm alem m a, Transport 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0719.pdf 
 Identifier    ZNC-1983-38c-0719 
 Volume    38