Seasonal changes in endogenous ABA and IAA and the influence of applied ABA and auxin in relation to shoot growth and abscission in Valencia Orange (Citrus sinensis (L.) Osbeck)

Plummer, Julie; Mullins, M. G.; Vine, John

doi:10.1007/bf00024960

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…2, Table 1), suggesting that increased concentrations of ABA in the xylem could accelerate leaf abscission at a threshold level of approximately 1.7-1.8 µM. Similarly, Plummer et al (1991) reported that ABA application to the woody base tissue of the stem induced leaf abscission in intact citrus plants.…”

Section: Water Stressmentioning

confidence: 90%

Xylem abscisic acid accelerates leaf abscission by modulating polyamine and ethylene synthesis in water-stressed intact poplar

Chen

Wang

Hüttermann

et al. 2001

Trees

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We investigated the effects of endogenous and exogenous abscisic acid (ABA) on polyamines (PAs) and ethylene synthesis and their relevance to leaf senescence in 1-year-old intact cuttings of a drought-sensitive poplar genotype Populus × euramericana cv. I-214 (cv. Italica) and a drought-tolerant genotype P. popularis 35-44 (P. popularis). P. popularis exhibited a transitory and moderate increase in xylem ABA concentrations in response to water stress and no leaf abscission during the period of drought (30% of field capacity; the soil water potential was -2.108 MPa). In contrast, leaf shedding occurred in stressed cv. Italica following a sustained increase in xylem ABA concentrations (up to 1.73 µM). Application of ABA to the transpiration stream accelerated leaf abscission in both genotypes with a threshold of approximately 1.7-1.8 µM. Initial elevation of xylem ABA concentrations reduced PA levels but enhanced ethylene synthesis simultaneously at the onset of water stress or the ABA treatment. Moreover, sharp increases in ABA concentrations, i.e. over 1.7 µM, severely restricted PA synthesis in aged leaves in the longer term (within 3 days). Leaves abscised following a progressive decline of PA levels, when putrescine decreased below approximately 0.5 µmol g -1 fresh weight, and spermidine and spermine became almost undetectable by HPLC. Therefore, we concluded that a drastic reduction in the level of PAs might increase the sensitivity of the leaf to ethylene, thus accelerating defoliation, even though the ethylene emission of stressed plants returned to prestress values by day 3. Young leaves were not shed during the period corresponding to the increase in xylem ABA, which appeared to result from the lesser reductions of PA. Compared with P. popularis, the inhibitory effect of ABA on PA synthesis was more pronounced in the drought-sensitive genotype cv. Italica. On the other hand, cv. Italica plants typically produced more ethylene than P. popularis. Taken together, these observations might explain our previous finding that ABA-treated plants of cv. Italica experienced more leaf loss than P. popularis .

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Section: Water Stressmentioning

confidence: 90%

Xylem abscisic acid accelerates leaf abscission by modulating polyamine and ethylene synthesis in water-stressed intact poplar

Chen

Wang

Hüttermann

et al. 2001

Trees

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“…During the harvest season, new flushes, young fruit for the following year's crop, and roots grow rapidly. These young tissues are rich sources of endogenous plant hormones (Goldschmidt, 1976;Hofman, 1990;Plummer et al, 1991). Therefore, it has been speculated that endogenous plant hormones from these young tissues account for the reduced response of mature fruit to abscission chemicals in 'Valencia' oranges (Holm and Wilson, 1976;Rasmussen, 1973;Wheaton et al, 1977).…”

mentioning

confidence: 99%

Physiological Factors Affecting Response of Mature `Valencia' Orange Fruit to CMN-Pyrazole. II. Endogenous Concentrations of Indole-3-Acetic Acid, Abscisic Acid, and Ethylene

Yuan¹,

Hartmond²,

Kender³

2001

jashs

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Endogenous concentrations of IAA and ABA in the peel, pulp, seed, and abscission zone of mature `Valencia' oranges [Citrus sinesis (L.) Osbeck] were determined by high-performance liquid chromatography and enzyme-linked immunosorbent assay from early November 1998 to mid-June 1999. Ethylene production of mature `Valencia' oranges during the same period was determined by gas chromatography. IAA concentrations in the pulp and seed were three to five times lower than those in the peel over the 7-month observation period. IAA concentration in the abscission zone and peel was high from late April to mid-May, the period of less responsiveness to abscission chemicals. ABA concentration in the pulp was low over the entire observation period. ABA concentration in the abscission zone and peel was low during the less responsive period. Ethylene production was always low except for a slight increase during late December and early February. The IAA to ABA ratio was high in the fruit abscission zone during the less responsive period. Fruit detachment force of CMN-pyrazole-treated fruit was positively correlated with the ratio of endogenous IAA to ABA or endogenous IAA, but negatively to endogenous ABA in the fruit abscission zone. These data suggest the balance between IAA and ABA in the fruit abscission zone may be an important factor in determining sensitivity and thereby the response of mature `Valencia' orange fruit to abscission chemicals. Chemical names used: abscisic acid (ABA); indole-3-acetic acid (IAA); 5-chloro-3-methyl-4-nitro-1H-pyrazole (CMN-pyrazole).

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“…This finding is consistent with results reported for tomatoes, mung beans, and apples (Decoteau & Craker, 1987;Michael, 1985;Wang et al, 2003) and suggests that increased endogenous ethylene production of leaf sheaths and leaf scars helps to regulate and control the defoliation rate. Previous studies in citrus fruits have shown ethylene promotes shedding at low concentrations but inhibits it at high concentrations (Abeles et al, 1992;Plummer et al, 1991). Ethylene production by mature leaf sheaths and leaf scars showed a gradual declining trend.…”

Section: Discussionmentioning

confidence: 85%

“…The production of ethylene significantly affects plant organ shedding. In citrus fruits during the early stage of abscission, ethylene promotes organ shedding at low concentrations but inhibits it at high concentrations (Abeles et al, 1992;Plummer et al, 1991). Spraying low concentrations of ethylene on bean leaves can artificially induce bean leaf shedding (Jackson & Osborne, 1970).…”

Section: Introductionmentioning

confidence: 99%

Relationship between endogenous ethylene production and natural defoliation traits during the maturation of sugarcane

et al. 2015

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The relationship between endogenous ethylene production and natural defoliation rate was examined in sugarcane cultivars with different natural defoliation traits. Ethylene production was examined at different positions on leaf sheaths and leaf scars at various sugarcane maturation stages using gas chromatography as an external standard method. During the sugarcane maturation process, ethylene production was greatest in the 2nd leaf sheath scar, followed by the 5th and 10th, in that order. It was also greatest during the early maturation stage, followed by the mid-maturation and harvest stages. Ethylene production of the leaf sheaths and leaf scars differed significantly among the sugarcane cultivars. Cultivars that defoliate easily produced significantly more ethylene than those that do not defoliate easily. The natural defoliation rates was greatest in the harvest stage, followed by mid-maturation and early maturation stage. Correlation analysis indicated that ethylene production was positively correlated with natural defoliation rates, particularly during early-and mid-maturation stages.

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Seasonal changes in endogenous ABA and IAA and the influence of applied ABA and auxin in relation to shoot growth and abscission in Valencia Orange (Citrus sinensis (L.) Osbeck)

Cited by 16 publications

References 16 publications

Xylem abscisic acid accelerates leaf abscission by modulating polyamine and ethylene synthesis in water-stressed intact poplar

Xylem abscisic acid accelerates leaf abscission by modulating polyamine and ethylene synthesis in water-stressed intact poplar

Physiological Factors Affecting Response of Mature `Valencia' Orange Fruit to CMN-Pyrazole. II. Endogenous Concentrations of Indole-3-Acetic Acid, Abscisic Acid, and Ethylene

Relationship between endogenous ethylene production and natural defoliation traits during the maturation of sugarcane

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