CHANGES IN ABSCISIC ACID AND GIBBERELLIN LEVELS IN APPLE SEEDS DURING STRATIFICATION AND THEIR RELATIONSHIP TO GENETIC COMPACTION

1978 ◽  
Vol 58 (3) ◽  
pp. 761-767 ◽  
Author(s):  
J. M. LEE ◽  
N. E. LOONEY
Keyword(s):  
Abscisic Acid ◽  
Seed Coat ◽  
Acid Content ◽  
Controlled Crosses ◽  
Aba Content ◽  
Abscisic Acid Content ◽  
Apple Seeds

The levels of abscisic acid (ABA) and gibberellin-like (GA-like) substances were examined in apple seeds from controlled crosses known to produce 0 or 50% compact seedlings. All seed lots exhibited similar changes in ABA and GA-like substances during an 80-day stratification period. The seeds were divided into two fractions, seed coat plus integuments (SC + I) and the embryo plus cotyledons (E + C). The ABA content of the E + C fraction was low relative to that in the SC +I fraction and gradually decreased during stratification. Abscisic acid content of the SC + I fraction increased markedly early in the stratification period and then gradually decreased. The GA-like activity, found primarily in the SC + I fraction, gradually increased (up to 40 days) and then decreased.

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.

scholarly journals Possible relationship between aggressiveness of two Eutypa lata isolates and their polyamines and abscisic acid content

OENO One ◽  
1997 ◽  
Vol 31 (3) ◽  
pp. 153
Author(s):  
Tayeb Koussa ◽  
Michel Broquedis ◽  
Bernadette Dubos
Keyword(s):  
Abscisic Acid ◽  
Growth Regulators ◽  
Acid Content ◽  
Hplc Analysis ◽  
Eutypa Lata ◽  
Virulent Isolate ◽  
Aba Content ◽  
Abscisic Acid Content ◽  
Antagonist Effect ◽  
Medium Culture

<p style="text-align: justify;">By HPLC analysis, we showed that myceliums of two <em>Eutypa lata</em> isolates cultivated in Enikson and Petersson medium culture synthesized polyamines (Putrescine, Spermidine and Spermine) and abscisic acid (ABA).</p><p style="text-align: justify;">ln this medium, myceliums of high virulent isolate (BXI-IO) produced fewer polyamines than less virulent isolate (BX 1-5) while inverse phenomenon was observed for ABA content. The two growth regulators were diffused in medium culture in which their levels increase with age of mycelium. In the end, variations of PA and ABA in myceliums show antagonist effect of the two growth regulators in <em>Eutypa lata</em> fungi.</p>

scholarly journals Studies on the Growth and Indole-3-Acetic Acid and Abscisic Acid Content of Zea mays Seedlings Grown in Microgravity

1992 ◽  
Vol 100 (2) ◽  
pp. 692-698 ◽  
Author(s):  
Aga Schulze ◽  
Philip J. Jensen ◽  
Mark Desrosiers ◽  
J. George Buta ◽  
Robert S. Bandurski
Keyword(s):  
Zea Mays ◽  
Acetic Acid ◽  
Abscisic Acid ◽  
Acid Content ◽  
Abscisic Acid Content ◽  
Indole 3 Acetic Acid

scholarly journals Interactions between leaf water potential, stomatal conductance and abscisic acid content of orange trees submitted to drought stress

2004 ◽  
Vol 16 (3) ◽  
pp. 155-161 ◽  
Author(s):  
Mara de Menezes de Assis Gomes ◽  
Ana Maria Magalhães Andrade Lagôa ◽  
Camilo Lázaro Medina ◽  
Eduardo Caruso Machado ◽  
Marcos Antônio Machado
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Stomatal Conductance ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Acid Content ◽  
Stomatal Closure ◽  
Leaf Water ◽  
Orange Trees ◽  
Abscisic Acid Content

Thirty-month-old 'Pêra' orange trees grafted on 'Rangpur' lemon trees grown in 100 L pots were submitted to water stress by the suspension of irrigation. CO2 assimilation (A), transpiration (E) and stomatal conductance (g s) values declined from the seventh day of stress, although the leaf water potential at 6:00 a.m. (psipd) and at 2:00 p.m. (psi2) began to decline from the fifth day of water deficiency. The CO2 intercellular concentration (Ci) of water-stressed plants increased from the seventh day, reaching a maximum concentration on the day of most severe stress. The carboxylation efficiency, as revealed by the ratio A/Ci was low on this day and did not show the same values of non-stressed plants even after ten days of rewatering. After five days of rewatering only psi pd and psi2 were similar to control plants while A, E and g s were still different. When psi2 decreases, there was a trend for increasing abscisic acid (ABA) concentration in the leaves. Similarly, stomatal conductance was found to decrease as a function of decreasing psi2. ABA accumulation and stomatal closure occurred when psi2 was lower than -1.0 MPa. Water stress in 'Pera´ orange trees increased abscisic acid content with consequent stomatal closure and decreased psi2 values.

scholarly journals Water content, lipid deposition, and (+)-abscisic acid content in developing white spruce seeds

1999 ◽  
Vol 50 (337) ◽  
pp. 1359-1364 ◽  
Author(s):  
D. J. Carrier ◽  
E. J. Kendall ◽  
C. A. Bock ◽  
J. E. Cunningham ◽  
D. I. Dunstan
Keyword(s):  
Abscisic Acid ◽  
Water Content ◽  
Acid Content ◽  
White Spruce ◽  
Lipid Deposition ◽  
Abscisic Acid Content

Changes in abscisic acid content during and after drought are related to carbohydrate mobilization and hydraulic recovery in poplar stems

2020 ◽  
Vol 40 (8) ◽  
pp. 1043-1057 ◽  
Author(s):  
Cecilia Brunetti ◽  
Tadeja Savi ◽  
Andrea Nardini ◽  
Francesco Loreto ◽  
Antonella Gori ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Hydraulic Conductivity ◽  
Stomatal Closure ◽  
Populus Nigra ◽  
Plant Responses ◽  
Stem Water Potential ◽  
Transport Efficiency ◽  
Drought Relief ◽  
Aba Content ◽  
Abscisic Acid Content

Abstract Drought compromises plant's ability to replace transpired water vapor with water absorbed from the soil, leading to extensive xylem dysfunction and causing plant desiccation and death. Short-term plant responses to drought rely on stomatal closure, and on the plant's ability to recover hydraulic functioning after drought relief. We hypothesize a key role for abscisic acid (ABA) not only in the control of stomatal aperture, but also in hydraulic recovery. Young plants of Populus nigra L. were used to investigate possible relationships among ABA, non-structural carbohydrates (NSC) and xylem hydraulic function under drought and after re-watering. In Populus nigra L. plants subjected to drought, water transport efficiency and hydraulic recovery after re-watering were monitored by measuring the percentage loss of hydraulic conductivity (PLC) and stem specific hydraulic conductivity (Kstem). In the same plants ABA and NSC were quantified in wood and bark. Drought severely reduced stomatal conductance (gL) and markedly increased the PLC. Leaf and stem water potential, and stem hydraulic efficiency fully recovered within 24 h after re-watering, but gL values remained low. After re-watering, we found significant correlations between changes in ABA content and hexoses concentration both in wood and bark. Our findings suggest a role for ABA in the regulation of stem carbohydrate metabolism and starch mobilization upon drought relief, possibly promoting the restoration of xylem transport capacity.

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