Decline of photosynthetic capacity with leaf age and position in two tropical pioneer tree species

Kitajima, Kaoru; Mulkey, Stephen S.; Samaniego, Mirna; Wright‬, S. Joseph

doi:10.3732/ajb.89.12.1925

American J of Botany

2002

DOI: 10.3732/ajb.89.12.1925

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Decline of photosynthetic capacity with leaf age and position in two tropical pioneer tree species

Kaoru Kitajima

¹

,

Stephen S. Mulkey

²

,

Mirna Samaniego

³

et al.

Abstract: The effect of leaf age on photosynthetic capacity, a critical parameter in the theory of optimal leaf longevity, was studied for two tropical pioneer tree species, Cecropia longipes and Urera caracasana, in a seasonally dry forest in Panama. These species continuously produce short-lived leaves (74 and 93 d, respectively) during the rainy season (May-December) on orthotropic branches. However, they differ in leaf production rate, maximum number of leaves per branch, light environment experienced by the leaves,… Show more

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Cited by 171 publications

(170 citation statements)

References 30 publications

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“…The decline in A max with leaf senescence was rather sudden in control plants compared with plants growing with low Ca supply. The values of these negative slopes are similar to those reported in two tropical tree species with mean leaf longevity between 74 d and 94 d (−0.02 and −0.25 μmol m −2 s −1 d −1 , respectively; Kitajima et al , 2002 ). In control plants, a sudden reduction in A max from fully expanded young leaves to the last measured leaf age suggests that, even if the leaves continued to live longer, they would not contribute to the growth of the plant, supporting the hypothesis that the leaves will be shed at the time when the maximum lifetime carbon balance is attained ( Field and Mooney, 1986 ; Kikuzawa, 1991 ; Mediavilla and Escudero, 2003 ).…”

Section: Discussionsupporting

confidence: 85%

Leaf lifetime photosynthetic rate and leaf demography in whole plants of Ipomoea pes-caprae growing with a low supply of calcium, a ‘non-mobile’ nutrient

Suárez

¹

2010

Journal of Experimental Botany

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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“…The decline in A max with leaf senescence was rather sudden in control plants compared with plants growing with low Ca supply. The values of these negative slopes are similar to those reported in two tropical tree species with mean leaf longevity between 74 d and 94 d (−0.02 and −0.25 μmol m −2 s −1 d −1 , respectively; Kitajima et al , 2002 ). In control plants, a sudden reduction in A max from fully expanded young leaves to the last measured leaf age suggests that, even if the leaves continued to live longer, they would not contribute to the growth of the plant, supporting the hypothesis that the leaves will be shed at the time when the maximum lifetime carbon balance is attained ( Field and Mooney, 1986 ; Kikuzawa, 1991 ; Mediavilla and Escudero, 2003 ).…”

Section: Discussionsupporting

confidence: 85%

Leaf lifetime photosynthetic rate and leaf demography in whole plants of Ipomoea pes-caprae growing with a low supply of calcium, a ‘non-mobile’ nutrient

Suárez

¹

2010

Journal of Experimental Botany

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…Numerous studies have reported that leaf senescence involves the degradation of proteins and chlorophyll, the loss of nitrogen, and the subsequent remobilization of these nutrients to younger leaves [15,[18][19][20]. For instance, it has demonstrated that older leaves actively export nutrients and other resources to younger tissues, a process that is accompanied by a decline in their own photosynthetic capacity [33]. Our findings are consistent with these observations.…”

Section: Senescencesupporting

confidence: 91%

Coordinated Diffusional and Biochemical Limitations Underlie Age-Related Decline in Photosynthetic Capacity of Rice Leaves

Xiong

¹

,

Ma

²

,

Mu

³

et al. 2025

Preprint

0

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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“…The photosynthetic rates of lower leaves declined in both PsJN and control plants as switchgrass aged, which agreed with previous reports on other crops and trees [31,32,[43][44][45]. However, faster senescence was observed in lower leaves, indicated by faster decline of photosynthetic rates, transpiration rates and stomatal conductance of PsJN inoculated switchgrass, which supported the prediction that leaf life span was negatively related to initial photosynthetic rates [47].…”

Section: Psjn Enhances Growth Through a Variety Of Mechanismssupporting

confidence: 91%

Burkholderia phytofirmans strain PsJN advanced development and altered leaf level physiology of switchgrass

Wang

¹

,

Seiler

²

,

Mei

³

2015

Biomass and Bioenergy

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

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