Showing papers on "Excoecaria agallocha published in 1996"

Chlorophylls, carotenoids, proteins and secondary metabolites in leaves of 14 species of mangrove

Abstract: Chlorophyll a, b, a+b, a:b, carotenoids, TAN (Titrable Acid Number), proteins, polyphenols, and tannin content of 14 species of mangroves viz. Aegiceras corniculatum, Aglaia cucullata, Avicennia officinalis, Bruguiera parviflora, B. sexangula, Ceriops decandra, Cynometra iripa, Excoecaria agallocha, Heritiera fomes, H. littoralis, H. macrophylla, Kandelia candel, Rhizophora mucronata and Xylocarpus granatum found in the mangrove forests of Bhitarkanika and the Mahanadi delta of Orissa were estimated. Total chlorophyll content varied from 0.21% in A. cucullata and C. decandra to 0.56% in A. corniculatum. Calculated chlorophyll a:b ratio was the minimum (1.55) in A. officinalis and the maximum (3.50) in B. sexangula. The carotenoids also varied from 0.04% in B. sexangula to 0.17% in A. corniculatum. Analysis of Variance showed intra- and interspecific variations in photosynthetic activities. TAN values revealed appreciable variations from 20.00 to 45.00 in A. officinalis and H. littoralis respectively. TAN values showed negative correlation with chlorophyll b and carotenoids, but highly significant positive correlation was noted with chlorophyll a:b ratio among the species. Total leaf protein content significantly varied from 12.21% in H. macrophylla to 29.22% in H. fomes. The quantitative analysis of tannin and polyphenols from the leaves of mangroves showed significant variation, 8.39% to 44.27% in A. cucullata and B. sexangula and 11.39% to 52.89% in A. officinalis and C. decandra respectively. Statistical analysis of the endogenous level of polyphenols and tannins showed no interdependence with leaf proteins.

Three New Labdane-Type Diterpenes from Wood, Excoecaria agallocha

Abstract: From the wood of Excoecaria agallocha LINN., three new labdane-type diterpenes, ent-11α-hydroxy-3-oxo-13-epi-manoyl oxide (4), ent-16-hydroxy-3-oxo-13-epi-manoyl oxide (5) and ent-15-hydroxy-labda-8(17), 13E-diene-3-one (6) were isolated together with three known compounds, ent-3-oxo-13-epi-manoyl oxide (ribenone, 1), ent-3β-hydroxy-13-epi-manoyl oxide (ribenol, 2) and ent-13-epi-manoyl oxide (3), and their structures were determined.

Chemical Structures of Excoecarins A, B and C: Three New Labdane-Type Diterpenes from Wood, Excoecaria agallocha.

Abstract: Three new diterpenes, excoecarins A (2), B (3) and C (4) have been isolated from the wood of Excoecaria agallocha LINN. The structures of excoecarins A, B and C were established as (13R, 14R)-ent-8α, 13;14, 15-diepoxy-13-epi-labda-3-one (2), (13R, 14S)-ent-8α, 13;14, 15-diepoxy-13-epi-labda-3-one (3), (13R, 14R)-ent-8α, 13;14, 15-diepoxy-13-epi-labda-3β-ol (4), respectively, on the basis of spectroscopic data and chemical evidence.

Three New Labdane‐Type Diterpenes from Wood, Excoecaria agallocha.

Abstract: From the wood of Excoecaria agallocha LINN., three new labdane-type diterpenes, ent-11α-hydroxy-3-oxo-13-epi-manoyl oxide (4), ent-16-hydroxy-3-oxo-13-epi-manoyl oxide (5) and ent-15-hydroxy-labda-8(17), 13E-diene-3-one (6) were isolated together with three known compounds, ent-3-oxo-13-epi-manoyl oxide (ribenone, 1), ent-3β-hydroxy-13-epi-manoyl oxide (ribenol, 2) and ent-13-epi-manoyl oxide (3), and their structures were determined.

Influence of Deer on the Artificial Regeneration in the Mangrove of Sundarbans, Bangladesh

Abstract: Studies made on the scope of artificial regeneration in the mangrove of Sundarbans, Bangladesh showed uncertain prospect due to browsing of the panted seedlings by the Spotted Deer ( Axis axis ). The Deer had a significant detrimental effect on the regeneration of Heritiera fornes, Xylocarpus mekongensis, Bruguiera sexangula, Ceriops decandra and Avicennia officinalis . Only Excoecaria agallocha was found to overcome the influence of Deer browsing to a large extent.