Shade tree traits and microclimate modifications: Implications for pathogen management in biodiverse coffee agroforests

Characterization of non polar-polar solvent extracts from some tea plantation shade tree leaves with special reference to antioxidant and antibacterial activities

Research in Plant Biology ◽

10.25081/ripb.2020.v10.6235 ◽

2020 ◽

pp. 15-21

Author(s):

Arindam Ghosh ◽

Soumya Majumder ◽

Sumedha Saha ◽

Malay Bhattacharya

Keyword(s):

Cardiac Glycosides ◽

Polar Solvent ◽

Reducing Power ◽

Scavenging Activity ◽

Shade Trees ◽

Crude Fibre ◽

Shade Tree ◽

Dpph Scavenging Activity ◽

Dpph Scavenging

Beneficial properties of shade trees of tea plantations other than their medicinal properties have been extensively studied. This research was initiated to explore the properties of some shade trees with special emphasis on their antioxidant and antibacterial properties. Leaves from shade tree like Dalbergia sissoo (DS), Cassia siamea (CS), Derris robusta (DR), Leucaena leucocephala (LL), Acacia lenticularis (AL) and Melia azedarach (MA) were used for the study. Characterization of shade tree leaves by determination of moisture, crude fibre and ash content and tests of non polar – polar solvent extracts for steroid, tannins, cardiac glycosides and coumarin, free radical scavenging, ferric reducing power, NO scavenging activities, quantification of Flavonoids and antibacterial activity were conducted. The average moisture, crude fibre and ash percentage of shade tree plants were found to be 62.95, 11.28 and 1.86 respectively. Methanol, ethanol, acetone and ethyl acetate respectively proved to be the most potent solvent for various phytochemical extractions as it gave positive results for tests like tannin, steroid, cardiac glycosides and coumarin. AL (91.46%), DR (92.69%), LL (94.32%) and MA (93.34%) leaf extracts showed a high level of DPPH scavenging activity in their water extracts. In DS (88.11%) and CS (83.23%) maximum DPPH scavenging activity was observed in Diethyl ether and Methanol extracts respectively. Acetone extracts were more active than the water extracts in exhibiting ferric reducing power and NO scavenging activity. Summation of the quantity revealed that DS showed maximum presence of flavonoids and acetone as most potential for isolation of flavonoids. The decreasing order of summative antibacterial activity was recorded in DS, followed by CS, DR, AL, MA and LL. Chloroform showed the highest summative inhibition zone followed by ethanol, ethyl acetate, diethyl ether, acetone, water, hexane, benzene and methanol. The antioxidant and antibacterial potential of shade trees were established.

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Host tree traits in pasture areas affect forest and pasture specialist epiphyte species differently

American Journal of Botany ◽

10.1002/ajb2.1634 ◽

2021 ◽

Author(s):

João P. C. Elias ◽

Sara R. Mortara ◽

André F. Nunes‐Freitas ◽

Eduardo Berg ◽

Flavio N. Ramos

Keyword(s):

Host Tree ◽

Epiphyte Species ◽

Tree Traits

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Shade tree identity rather than diversity influences soil macrofauna in cacao-based agroforestry systems

Pedobiologia ◽

10.1016/j.pedobi.2021.150770 ◽

2021 ◽

pp. 150770

Author(s):

G.X. Rousseau ◽

O. Deheuvels ◽

D. Celentano ◽

I.R. Arias ◽

L.M. Hernández-García ◽

...

Keyword(s):

Agroforestry Systems ◽

Soil Macrofauna ◽

Shade Tree ◽

Tree Identity

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Investigation of Relationships between Ring Width Index and Tree Traits

10.7546/crabs.2021.05.10 ◽

2021 ◽

Author(s):

Mariyana Lyubenova ◽

Hristina Kalcheva ◽

Alexandre Chikalanov

Keyword(s):

Ring Width ◽

Tree Traits

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On the Word Shade-Tree

Science ◽

10.1126/science.84.2190.552.a ◽

1936 ◽

Vol 84 (2190) ◽

pp. 552-552

Author(s):

Glenn W. Herrick

Keyword(s):

Shade Tree

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Cecropia peltata (trumpet tree).

10.1079/fc.11955.20210113941 ◽

2021 ◽

Author(s):

Nick Pasiecznik

Keyword(s):

Invasive Species ◽

Pioneer Species ◽

Native Range ◽

Coffee Plantations ◽

Shade Tree ◽

Botanical Gardens ◽

Forest Clearance

Abstract C. peltata is an important pioneer species in its native range Americas following forest clearance. It has also been introduced into coffee plantations as a shade tree and into botanical gardens in Africa. However, its presence on the ISSG list of the 100 worst invasive species (ISSG, 2003) means that its notoriety as an invasive species may limit further introductions.

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