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Warrier, Rekha R.
- Seed Germination Studies in Saraca asoca (Roxb.) De Wilde
Abstract Views :385 |
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Authors
B. Gurudev Singh
,
Rekha R. Warrier
,
R. Anandalakshmi
,
V. Sivakumar
,
R. Sivalingam
,
N. P. Mahadevan
,
G. Chevanan
Source
Indian Forester, Vol 131, No 6 (2005), Pagination: 841-843Abstract
No abstract
- Studies on Sexual Variation in Clones of Casuarina equisetifolia forst
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Indian Forester, Vol 127, No 8 (2001), Pagination: 865-870Abstract
Flowering pattern in sex identified clones of Casuarina equisetifolia Forst. Grown as hedges in the clone bank of Institute of Forest Genetics and Tree Breeding, Coimbatore, India revealed that sex change occurs in this species. The population assembled and ischolar_mained ramets from three year old trees selected from Chengalpet and Chidambaram area of Tamil Nadu, India consisted of constant males, constant females and monoecious individuals at the time of introduction during 1992 and remained so till 1997. The data on flowering collected afterwards showed tbat constant males, constant females and monoeciouis individuals accounted for 59, 26 and 4 per cent of the population respectively. Six clones (11% of the population) changed their sex in various ways and became inconstant individuals. Studies on protein profiles undertaken during flowering and non-flowering seasons envisaged that the constants and in constants differed remarkably with respect to their protein levels. Continuous hedging may bring out plasticity of sex expression in a small per cent of population.- Melia Dubia Can. - a Protein Indigenous Fast Growing Species for Farmlands
Abstract Views :266 |
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Source
Indian Forester, Vol 138, No 6 (2012), Pagination: 567-568Abstract
No abstract- Response of Important Tropical Tree Species to Elevated CO2
Abstract Views :371 |
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Indian Forester, Vol 136, No 11 (2010), Pagination: 1439-1444Abstract
Global warming plays a major role in climate change which is caused mainly due to increase in CO2 level in the atmosphere. Present study attempted to evaluate four important tropical tree-species, Tectona grandis, Ailanthus excelsa, Casuanna equisetifolia and Casuarina ,Jungkuhniana for adaptation to elevated levels of CO2 at nursery stage. The study was conducted inside the poly tunnels and CO2 enrichment was done to double the concentration. Seedlings in poly tunnel without CO2 enrichment served as control The short term experiments revealed that of the four species studied, casuarinas performed well under elevated CO2 conditions in terms of all growth parameters studied. The performance of teak alone was poor indicating adverse effect of CO2 enrichment on morphological traits of tbiB species as seen by reduced leaf area, lesser dry' matter accumulation both in shoot and ischolar_main system and poor Seedling Quality Index at elevated CO, levels. Thus, in the present study, all the species except teak showed a positive response to CO2 enrichment in terms of morphological traits while Cuuarina equisetifolia and C. junghuhniana showed better growth and seedling quality indicating their better adaptability to elevated CO2level.- Drought Induced Morphological and Biochemical Responses in Casuarina equisetifolia Clones
Abstract Views :200 |
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Authors
Affiliations
1 Institute of Forest Genetics and Tree Breeding (Indian Council of Forestry Research and Education) Coimbatore-641002, Tamil Nadu, IN
1 Institute of Forest Genetics and Tree Breeding (Indian Council of Forestry Research and Education) Coimbatore-641002, Tamil Nadu, IN
Source
Indian Forester, Vol 142, No 6 (2016), Pagination: 547-557Abstract
Casuarina equisetifolia Forst., a high economic value tree crop, supports land reclamation, dune stabilization and shelter belts also. Genetic improvement of the species has led to development of high yielding clones which need to be characterized for effective utilization of the resource in harsh sites. Cuttings of ten clones of Casuarina equisetifolia selected for productivity were grown under potted conditions and subjected to water stress through withdrawal. Comparative morphological and biochemical responses of the clones to drought conditions were studied. The levels of pigments and non-enzymatic antioxidants as well as the activities of antioxidant enzymes were quantified. Results showed significant differences in clones in their response to drought stress with respect to both fresh and dry weights of plants. Among biochemicals, chlorophyll a and b, enzymes catalase and peroxidase did not reveal any significant differences in response to drought. Real water contents in both ischolar_mains and shoots varied under drought stress. There was an increase in both phenols and chlorophyll b contents under drought stress. Furthermore, proline activity reduced in drought treated plants. This was observed in all the clones. It is therefore, obvious that all of these characters play essential roles in the drought tolerance of plants. Clones also exhibited significant differences in their ability to respond to drought stress. Activities of chlorophyll a, peroxidase and a:b ratio were the only parameters which did not differ significantly between clones suggesting their activities to be stable in the species. These results indicate that phenols, chlorophyll activity and proline levels in different tissues could be used as markers of drought tolerance in casuarinas clones. Further, this study emphasized the role of sugars involved in ROS detoxification during drought stress, and identified potential clones for deployment in difficult sites.Keywords
Drought, Biometrics, Needles, Phenols, Proline.References
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