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Saini, A. D.
- Effect of Photoperiod on Annual Growth Cycle of Two forest Tree Species at Seedling Stage
Authors
1 Botanical Survey of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 10, No 1 (1968), Pagination: 84-89Abstract
The seedlings of Pterygota alata and Manilkara bojeriwere exposed daily to normal day length (ND), short day (SD) and long day (LD) conditions. Relative rates of extension growth were calculated under each treatment.Under ND conditions, Pterygota plants assumed dormant condition from November to March with major part of season's growth occurring in August-September. Manilkara plants under similar conditions, continued to grow though the growth rates declined progressively and were of lower order during December-January.
Under LD treatment, Pterygota plants became dormant one month later and resumed growth about two months earlier than ND plants; SD conditions, however, brought about dormant growth at the same time as ND treatment but the growth was resumed as under LD plants i.e. about two months earlier than ND. Manilkara plants were induced to dormant condition both under SD and LD treatments and the period corresponded exactly with small growth rates under ND conditions.
It is concluded that these two species are by and large indifferent to LD and SD conditions and that the annual growth-cycle in nature is more under the changing influence of total sum of weather conditions rather than entirely on day lengths.
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- Biochemical Affinities of some Species of Ficus
Authors
1 Botanical Survey of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 11, No 1-2 (1969), Pagination: 129-137Abstract
Polyphenolic constituents of eighteen Ficus species were studied as separated by paper chromatography. Their inter-relationship was examined on the basis of their paired affinity (PA) indices. A comparative relationship of each Species in respect of PA values with others, are shown in polygonal graphs. Each species posses a distinct shape and area of these polygons. F. eriobotryoides, the only species native of Tropical Africa included, has distinctly smaller PA values thereby indicating its remote relationship with others.
About 25-30% of the polyphenolic constituents are common in all the species, probably an indication of common heritage. At least two phenolics are found to be common to all the species studied.
PA indices between 30 and 60% are shown by a fairly large group of species in each case. Considering PA values above 60% or less than 30% as indicating more nearness or remoteness respectively, it is possible to show inter-relationship among them. The various species of the subgenus Urostigma clearly isolate themselves into one group. F. virens, F. elastica and F. drupaceae var. pubescens appear to be the connecting links between the species of the subgenus Urostigma and Ficus. Details of the relationship are discussed.
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