Physiology of abscission

Addicott, Fredrick T.

doi:10.1007/978-3-642-50088-6_70

Cited by 71 publications

(26 citation statements)

References 82 publications

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“…snow and freeze fracturing may also result in breakage and dislodging of twigs and branches. In the present study twig fall from oak may to a certain extent be attributed to abscission which occurs in response to a number of physiological and environmental factors resulting in the loss of less vigorous twigs (Addicott andLynch 1955. Chaney andLeopold 1972).…”

Section: Seasonality Of Wood Limer Fallmentioning

confidence: 78%

Wood decomposition in an abandoned beech and oak coppiced woodland in SE England

Boddy¹,

Swift

1983

Ecography

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Stand structure and rates and patterns of wood litterfall, between 23 June 1977 and 27 June 1979, are described for two sites In a coppiced beech Fagus sylvatica L. and oak Quercus petraea (Mattuschka) Liebl. woodland in south‐east England. Total wood fall (excluding trunks) was estimated at 1264 kg ha−1 and 593 kg ha−1 for the two years of sampling at one site and 776 kg ha−1 during the second year on the other site. The majority of leaf fall occurred in autumn; the maximum twig (wood < 1 cm diameter) and branch (wood ≥ 1 cm diameter) fall, occurred in winter at times generally corresponding with high wind speeds. Many oak twigs, however, abscissed in early November irrespective of wind speed. Branch characteristics at fall (size, state of decay and bark cover) were documented. The most significant feature observed was that a large amount of decay frequently occurred in branches whilst still in the canopy.

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Section: Seasonality Of Wood Limer Fallmentioning

confidence: 78%

Wood decomposition in an abandoned beech and oak coppiced woodland in SE England

Boddy¹,

Swift

1983

Ecography

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“…This could induce the formation of an abscission zone at the base. Embree (1967), Varley (1967) and Kulman (1971) suggested that grazing damage to buds and leaves may cause increased mortality of twigs, while Addicott & Lynch (1955) observed that grazing damage may initiate or accelerate the abscission process. The effect of these biotic agents continues to be felt during the rainy season when the weakened twigs and branches are additionally and easily dislodged by the monsoon rain storms.…”

Section: Discussionmentioning

confidence: 99%

“…Christensen (1975) observed that in 80% of the wood elements falling in May (the leaf flush period) November (the leaf fall period) and 95-100% of the wood components falling during the summer months in a Danish oak forest, a clear abscission zone was present. According to Addicott & Lynch (1955) and Addicott (1970), both the intrinsic (harmonal) and extrinsic (environmental) factors govern the development of the abscission zone. Christensen (1975) argued that herbivory, water stress, extreme temperatures and lack of adequate supply of mineral nutrients were responsible for the formation of an abscission layer.…”

Section: Annual Wood Litter Fallmentioning

confidence: 99%

Pattern of wood litter fall in five forests located along an altitudinal gradient in Central Himalaya

Mehra

Singh

1985

Vegetatio

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Wood and total litter fall were measured in five forests of the Kumaun Himalaya situated along an altitudinal gradient from 329 m to 1 850 m. Total annual wood litter fall, which ranged from 93 to 197 g m 2, was inversely related with altitude and positively related with forest basal cover. Total litter fall ranged from 405 to 839 g m 2 yr I and was positively related with forest basal cover. Wood litter fall was highest in the rainy season and that of total litter in the summer season. Abscissed litter accounted for a maximum proportion of seasonal wood fall in summer. Monthly non-abscissed wood fall was positively related to the monthly rainfall on each site. The fractions in lower diameter classes (0-5 to 5-10 mm) dominated the annual wood fall in all forests and accounted for 59 to 78% of the total. Fractions in >10 mm size class fall maximally during the rainy months.

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“…Most of the emphasis has been on the roles of ethylene and auxin; ethylene is known to promote and accelerate abscission, and auxin appears to have an inhibitory effect (Addicott ; Sexton and Roberts ). Early hypotheses about abscission focused on the balance of ethylene and auxin or auxin gradients across the abscission zone (AZ) (Hall ; Addicott and Lynch ; Addicott et al ). Abscisic acid (ABA), was first isolated from abscising cotton fruits and called abscisin II (Ohkuma et al ; Addicott et al ).…”

Section: Introductionmentioning

confidence: 99%

Letting Go is Never Easy: Abscission and Receptor‐Like Protein Kinases

Niederhuth

Cho

Seitz

et al. 2013

JIPB

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Abscission is the process by which plants discard organs in response to environmental cues/stressors, or as part of their normal development. Abscission has been studied throughout the history of the plant sciences and in numerous species. Although long studied at the anatomical and physiological levels, abscission has only been elucidated at the molecular and genetic levels within the last two decades, primarily with the use of the model plant Arabidopsis thaliana. This has led to the discovery of numerous genes involved at all steps of abscission, including key pathways involving receptor-like protein kinases (RLKs). This review covers the current knowledge of abscission research, highlighting the role of RLKs.

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Physiology of abscission

Cited by 71 publications

References 82 publications

Wood decomposition in an abandoned beech and oak coppiced woodland in SE England

Wood decomposition in an abandoned beech and oak coppiced woodland in SE England

Pattern of wood litter fall in five forests located along an altitudinal gradient in Central Himalaya

Letting Go is Never Easy: Abscission and Receptor‐Like Protein Kinases

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