scholarly journals Phytochrome-controlled level of growth substances in etiolated oat seedlings

2014 ◽  
Vol 61 (3-4) ◽  
pp. 381-388
Author(s):  
Jan Kopcewicz ◽  
Kazimierz Madela
Keyword(s):  
Abscisic Acid ◽  
Acid Content ◽  
Red Light ◽  
Light Irradiation ◽  
Growth Substances ◽  
Photostationary State ◽  
Endogenous Abscisic Acid ◽  
Abscisic Acid Content

Irradiation with red light of coleoptiles and leaves of etiolated oat seedlings, causing photoconversion of phytochrome mainly into P<sub>fr</sub>, leads to the release of free auxins and free gibberellins from conjugated forms. The effect of red light is reversible by far-red light irradiation. A correlation between the photostationary state of phytochrome and endogenous abscisic acid content was not found.

scholarly journals Abscisic acid content during cold hardening of barley and wheat cultivars with different freezing toler

2011 ◽  
Vol 48 (No. 11) ◽  
pp. 490-493
Author(s):  
Z. Faltusová-Kadlecová ◽  
M. Faltus ◽  
I. Prášil
Keyword(s):  
Abscisic Acid ◽  
Freezing Tolerance ◽  
Acid Content ◽  
The Other ◽  
Cold Hardening ◽  
Wheat Cultivars ◽  
Endogenous Abscisic Acid ◽  
Significant Change ◽  
Hydroponically Grown ◽  
Abscisic Acid Content

Endogenous content of abscisic acid was studied in a&nbsp;set of two winter cultivars of barleys (Lunet, Cenader), one spring cultivar (Akcent) and five winter cultivars of wheat (Mironovsk&aacute;, Samanta, &Scaron;&aacute;rka, Zdar, Apache) and one spring cultivar (Leguan) in the course of cold hardening of hydroponically grown plants. Freezing tolerance was also determined in all barley and wheat cultivars under study. In none of the barley varieties did cold hardening of plants induce any significant change in abscisic acid content. In wheat plants exposed to cold hardening, the cultivars Apache and Leguan showed a&nbsp;slight transitory increase in abscisic acid content. Abscisic acid content in leaves was very similar in the other wheat cultivars. Neither in barley nor in wheat was the level of freezing tolerance associated with endogenous abscisic acid content or with its transitory changes during cold hardening.

Accumulation of abscisic acid in cotton fibre and seed of normal and abnormal bolls

2001 ◽  
Vol 137 (4) ◽  
pp. 445-451 ◽  
Author(s):  
SONAL J. GOKANI ◽  
VRINDA S. THAKER
Keyword(s):  
Abscisic Acid ◽  
Water Content ◽  
Acid Content ◽  
Marked Decrease ◽  
Age Groups ◽  
Dry Weight ◽  
Dry Matter Accumulation ◽  
Endogenous Abscisic Acid ◽  
Aba Content ◽  
Abscisic Acid Content

Cotton (Gossypium hirsutum L.) yield and quality is affected by altered fruiting patterns with progress in season. The present study was conducted to analyse normal and altered (abnormal) boll (fruit) development at maturation phase. Both normal and abnormal bolls of the same age groups were analysed for growth in terms of dry weight, water content and endogenous abscisic acid (ABA) content of fibre and seed. Endogenous level of ABA was estimated by using antibodies raised against ABA–protein conjugate. To amplify the reaction, indirect ELISA (Enzyme Linked Immuno Sorbent Assay) was performed. A marked decrease in dry matter accumulation (DMA) of seed and fibre was observed in abnormal bolls as the season progressed. Fibre from the abnormal bolls showed marked variation in endogenous ABA content, however, in abnormal seeds water content and endogenous abscisic acid content showed significant variation compared to that of normal bolls. From the results, it is concluded that a marked decrease in seed dry weight may be because of a decrease in water content and accumulation of higher endogenous abscisic acid content, whereas, the major reason for reduced fibre weight may be due to accumulation of endogenous abscisic acid.

Relations between photoperiod, temperature, abscisic acid, and fall dormancy in alfalfa (Medicago sativa)

1988 ◽  
Vol 66 (12) ◽  
pp. 2491-2498 ◽  
Author(s):  
Tony H. H. Chen ◽  
Frank S. C. Chen
Keyword(s):  
Abscisic Acid ◽  
Medicago Sativa ◽  
Acid Content ◽  
Peak Level ◽  
Fresh Weight ◽  
Endogenous Abscisic Acid ◽  
Fall Dormancy ◽  
Medicago Sativa L ◽  
Temperature Interaction ◽  
Abscisic Acid Content

Three alfalfa (Medicago sativa L.) cultivars differing in fall dormancy were examined for endogenous abscisic acid content in relation to fall dormancy. The alfalfa cultivars studied were 'Beaver' (dormant type), 'Lahonton' (semidormant type), and 'Moapa 69' (nondormant type). Alfalfa seedlings were grown in controlled-environment chambers set at a 16-h photoperiod (16 h light: 8 h dark) and 20:15 °C (light:dark) for 55 days. They were cut and then regrown under environmental conditions simulating summer and fall in western Canada. In leaf samples, the ABA level increased from about 200 in 3-week-old plants to more than 1200 ng/g fresh weight in 8-week-old plants. After cutting, abscisic acid levels dropped abruptly and then increased gradually, reaching a peak level at the stage of the appearance of flower buds. The peak of abscisic acid content was highest in 'Beaver', next highest in 'Lahontan', and lowest in the nondormant type, 'Moapa 69'. At the 6th week of regrowth, abscisic acid content in 'Beaver' was found to be 2200 ng/g fresh weight, which is the highest reported level in nonstressed plants of any species. The analysis of variance suggests photoperiod, temperature, and photoperiod × temperature interaction all have a significant effect on alfalfa regrowth and on abscisic acid content. Under long days and cool temperatures, the amount of foliage regrowth and the characteristic of fall dormancy are manifestly correlated. There is no apparent link between endogenous abscisic acid content and fall dormancy.

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