Histochemical Changes in Acacia Nilotica L. During Transition from Sapwood to Heartwood

Shah, J. J.; Baqui, Salma; Pandalai, R. C.; Patel, Kamlesh

doi:10.1163/22941932-90000391

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…This would occur via the mitochondria in the inner sapwood and at the heartwood boundary in the May-July period (in India) as found during the senescence of parenchyma of Acacia auriculiformis (Baqui & Shah 1985). Similar results were obtained with A. nilotica transition zone (Shah et al 1981). It would be expected that the enzymes and aluminium and other multivalent cations would occur uniformly in the transition zone, so that aluminium succinate would occur widespread in the heartwood.…”

Section: Discussionsupporting

confidence: 75%

Vessels in Cardwellia Sublimis Containing Aluminium and Magnesium Salts

Hillis¹

2000

IAWA J

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White deposits occurred in isolated, randomly located vessels in areas of a Cardwellia sublimis sample. They were shown to contain aluminium cation with about one-tenth the amount of magnesium cation. Other studies have indicated the main salt to be the very insoluble aluminium succinate. Deposits may fill cross-sections of vessels which are only occasionally seen in association with ray parenchyma. It is concluded that the salts are formed at the pits of particular associations of ray parenchyma cells with vessels and the salts are then forced into the rest of the vessel.

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Section: Discussionsupporting

confidence: 75%

Vessels in Cardwellia Sublimis Containing Aluminium and Magnesium Salts

Hillis¹

2000

IAWA J

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“…The composition of the substances formed is under genetic control and the amount formed is significantly influenced by the physiological conditions impinging on the parenchyma at the time of formation. In Robinia pseudoacacia (black locust), as in other heartwood forming species, the transition zone between sapwood and heartwood shows an enhanced metabolic activity at certain times of the vegetation period (Baqui and Shah 1985;H611 and Lendzian 1973;Magel et al 1991;Nobuchi and Harada 1983;Shah et al 1981).…”

Section: Introductionmentioning

confidence: 99%

Formation of heartwood substances in the stemwood of Robinia pseudoacacia L. II. Distribution of nonstructural carbohydrates and wood extractives across the trunk

Magel

Jay‐Allemand²,

Ziegler

1994

Trees

103

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Summary. The distributions of reserve carbohydrates and of three dominant heartwood extractives were determined in the trunkwood of Robinia pseudoacacia L. The trees were cut at different times of the year (September, November, January, and April). With the exception of the tree felled in January, all trunks exhibited highest contents of nonstructural storage carbohydrates (glucose, fructose, sucrose, and starch) in the youngest, outermost sapwood zone. With increasing depth of the trunk, the levels of carbohydrates decreased. At the sapwood-heartwood transition zone, only trace amounts of nonstructural carbohydrates were present. The heartwood itself contained no storage material. The wood zones of different ages of the trees cut in September, November, and January exhibited glucose/fructose ratios of approximately 1. In April, however, there was a shift to glucose. In the youngest sapwood the amounts of soluble sugars were higher in the early-than in the latewood. Older zones of the sapwood and the sapwood-heartwood transition zone showed the opposite behaviour. Three main wood extractives of Robinia were characterized and quantified: the flavanonol dihydrorobinetin (DHR), the flavonol robinetin (ROB) and a hydroxycinnamic acid derivative (HCA). Only DHR was present -in very low amounts -in the younger sapwood of all trunks investigated, Higher amounts (>1 ~tmol/g dry weight) of this compound and the HCA were present in the sapwood-heartwood transition zone. DHR augmented within the heartwood up to a more or less constant level. HCA increased towards the heartwood and decreased again in the inner heartwood parts. ROB appeared in the innermost parts of the sapwood-heartwood transition zone and reached maximum values in older parts of the heartwood. The results indicate that starch is hydrolyzed at the sapwood-heartwood boundary and thus represents a pri-* Dedicated to Prof. Meinhart H. Zenk oll the occasion of his 60th birthdayCorrespondence to: E. Magel mary major source of hydroxycinnamic acid and flavonoid synthesis.

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“…The changes occurring during the formation of heartwood are very complex. Histochemical changes during the formation of heartwood have been studied in a few plants (Baqui et aI., 1979;Shah et a!., 1981Shah et a!., , 1982, but as far as we know there is no report of the histochemical changes during heartwood formation in Tectona grandis (Teak).…”

Section: Introductionmentioning

confidence: 99%

Histochemical Studies of the Transition from Sapwood to Heartwood in Tectona Grandis

Datta¹,

Kumar²

1987

IAWA J

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Histochemistry of the wood of Tectona grandis Linn. f. (Verbenaceae) has been studied during the transition from sapwood to heartwood. Starch, lipids, proteins, nucleic acids, phenolics and the enzymes peroxidase, succinate dehydrogenase, acid phosphatase, adenosine triphosphatase and glucose-6-phosphatase show significant changes during the transition. Peroxidase and adenosine triphosphatase are highly active in the sapwood and moderate in the transition zone while succinate dehydrogenase, glucose-6-phosphatase and acid phosphatase are moderate throughout the sapwood.

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Histochemical Changes in Acacia Nilotica L. During Transition from Sapwood to Heartwood

Cited by 13 publications

References 7 publications

Vessels in Cardwellia Sublimis Containing Aluminium and Magnesium Salts

Vessels in Cardwellia Sublimis Containing Aluminium and Magnesium Salts

Formation of heartwood substances in the stemwood of Robinia pseudoacacia L. II. Distribution of nonstructural carbohydrates and wood extractives across the trunk

Histochemical Studies of the Transition from Sapwood to Heartwood in Tectona Grandis

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