Is Abscisic Acid Responsible for Abnormal Stomatal Closure in Coconut Palms Showing Lethal Yellowing?

Martinez, S.; Cordova, Ivan; Maust, B.E.; Oropeza, Carlos; Santamaría, Jorge M.

doi:10.1016/s0176-1617(00)80068-1

Cited by 19 publications

(11 citation statements)

References 17 publications

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“…The lower G s in the diseased treatments was also not due to an increased leaf ABA concentration. León et al (1996) and Martinez et al (2000) arrived at the same conclusion in their study of lethal yellowing of coconut palms. Although ABA concentration increased in lethal yellowing-diseased coconut palms, the increase occurred only when G s in diseased palms had dropped to c. 20% that of symptomless palms.…”

Section: Absence Of Increased Stomatal Limitation On Photosynthesismentioning

confidence: 57%

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Physiological responses of Catharanthus roseus (periwinkle) to ash yellows phytoplasmal infection

Tan

Whitlow

2001

New Phytologist

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Summary• Photosynthetic responses of periwinkle ( Catharanthus roseus ) were compared during disease development after infection by two strains of ash yellows (AshY) phytoplasmas that differed in aggressiveness.• Healthy plants were inoculated by grafting with diseased scions. Mature leaves formed before grafting of diseased scion, and leaves formed during disease development were monitored for physiological changes.• Leaves formed before inoculation remained visually and physiologically asymptomatic until normal senescence. However, leaves formed after inoculation had reduced photosynthesis, due to reductions in both the maximum carboxylation rate ( Vc max ) and noncyclic electron transport ( J max ). In these leaves, photoinhibition resulted from photoprotective processes rather than photooxidative damage to PSII reaction centres. Stomatal conductance ( G s ) was reduced, but this did not increase the stomatal limitation to photosynthesis. Changes in G s were not correlated with changes in leaf ABA concentration.• Known differences in phytoplasmal aggressiveness were correlated with degrees of inhibition of photosynthesis and occurence of photoinhibition. AshY phytoplasmas appear to cause metabolic perturbations associated with localized accumulation or multiplication of the pathogen in symptomatic leaves. Key words: Catharanthus roseus

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Section: Absence Of Increased Stomatal Limitation On Photosynthesismentioning

confidence: 57%

“…León et al . (1996) and Martinez et al . (2000) arrived at the same conclusion in their study of lethal yellowing of coconut palms.…”

Section: Discussionmentioning

confidence: 95%

Physiological responses of Catharanthus roseus (periwinkle) to ash yellows phytoplasmal infection

Tan

Whitlow

2001

New Phytologist

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“…Some authors demonstrated that in coconut lethal yellowing-infected plants, it is independent from ABA concentration in leaves (Leon et al, 1996;Martinez et al, 2000). Some authors demonstrated that in coconut lethal yellowing-infected plants, it is independent from ABA concentration in leaves (Leon et al, 1996;Martinez et al, 2000).…”

Section: Non-stomatal Control Of Photosynthesis During Fd Infectionmentioning

confidence: 99%

“…The cause of stomatal closure in phytoplasma-infected plants is still debated. Some authors demonstrated that in coconut lethal yellowing-infected plants, it is independent from ABA concentration in leaves (Leon et al, 1996;Martinez et al, 2000). A proposed mechanism to explain stomata closure involved sucrose accumulation in the apoplast of guard cells (Lu et al, 1997).…”

Section: Non-stomatal Control Of Photosynthesis During Fd Infectionmentioning

confidence: 99%

“…Currently, the key ecophysiological leaf traits related to phytoplasma disease symptoms are decreased rates of gas exchange variables: carbon assimilation (A) and water transpiration (E) (Tan & Whitlow, 2001;Endeshaw et al, 2012). Proposed mechanisms leading to stomatal closure were related to an increase in abscisic acid (ABA) concentration (Leon et al, 1996;Martinez et al, 2000) and sucrose accumulation around guard cells, as reported by Lu et al (1997). However, there is little information about stomatal limitation.…”

Section: Introductionmentioning

confidence: 99%

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Flavescence dorée phytoplasma deregulates stomatal control of photosynthesis in Vitis vinifera

Vitali

Chitarra

Galetto

et al. 2013

Annals of Applied Biology

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Flavescence dorée (FD) is among the major grapevine diseases causing high management costs; curative methods against FD are unavailable. In FD-infected plants, decrease in photosynthesis is usually recorded, but deregulation in stomatal control of leaf gas exchange during FD infection and recovery is unknown. We measured the seasonal time course of gas exchange rates in two cultivars ('Barbera' and 'Nebbiolo') during the term of 1 year when grapevines experienced a water stress and another with no drought, with difference in gas exchange rates in response to FD infection and recovery as assessed by symptom observation and phytoplasma detection through PCR analysis. Chlorophyll fluorescence was also evaluated at the time of maximum symptom severity in 'Barbera', the cultivar showing the most severe stress response to FD infection, causing the highest damage in vineyards of north-western Italy. In FD-infected plants, net photosynthesis and transpiration gradually decreased during the season, more during the no drought year than during drought. During recovery, healthy (PCR negative) plants infected 2 years before, but not those infected an year before, regained the gas exchange performances to the level as measured before infection. The relationships between stomatal conductance and the residual leaf intercellular CO 2 concentration (c i ) discriminated healthy versus FD-infected and recovered plants; at the same c i , FD-infected leaves had higher non-photochemical quenching than healthy ones. We conclude that metabolic, not stomatal, leaf gas exchange limitation in FD-infected and recovered grapevines is the basis of plant response to FD disease. In addition, we also suggest that such response is dependent upon water stress, by showing that water stress superimposes on FD infection in terms of stomatal and metabolic non-stomatal limitations to carbon assimilation.

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Hormonal Changes in Plants Under Attack

Walters

2015

Physiological Responses of Plants to Attack

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Is Abscisic Acid Responsible for Abnormal Stomatal Closure in Coconut Palms Showing Lethal Yellowing?

Cited by 19 publications

References 17 publications

Physiological responses of Catharanthus roseus (periwinkle) to ash yellows phytoplasmal infection

Physiological responses of Catharanthus roseus (periwinkle) to ash yellows phytoplasmal infection

Flavescence dorée phytoplasma deregulates stomatal control of photosynthesis in Vitis vinifera

Hormonal Changes in Plants Under Attack

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