H. Nagesh Prabhu , Rajesh P. Gunaga , T. Surendran

Abstract

Teak is an important plantation species of the tropics. Due to its unique wood properties, it is also widely planted out side its natural range. Variation present in reproductive traits is most important in tree improvement programmes. Seed production areas and seed sources were identified for qualitative variations in fruit traits such as nature of fruit calyx attachment, hairiness and splitting nature. Considering seed production areas, variations were found to be strong between SPAs and within seed sources differences were negligible. Splitting nature of fruits was also observed as strong seed sources effect, while SPAs located in southern seed sources of Kerala, were without splitting nature. These variations could be helpful during identification of seeds of different seed sources and it may have important role on germination.

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Bhausaheb Tambat , K. Vishwanath , G. N. Chaithra , Rajesh P. Gunaga

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Recently, abnormal seeds in Gymnacranthera farquhariana Hook. f. and Thomson (Myristicaceae) an endangered swampy species of Western Ghats, India has been observed for the first time. Abnormal seeds had a characteristic 'cap', which is absent in normal seeds. A comparative analysis of seed parameters indicated that fitness of abnormal seeds is no more different from normal category. However, under ambient conditions where the normal seeds showed proper germination, abnormal ones fail to germinate. Although, the factors responsible for such abnormalities in G. farquhariana are not clearly understood, yet based on laboratory and field observations we predicated that the species may suffer due to inbreeding depression. Further genetic studies are needed to confirm these predictions.

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Rajesh P. Gunaga , H. Nagesh Prabhu , T. Surendran

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No abstract

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Rajesh P. Gunaga , Avinash M. Kanfade , R. Vasudeva

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No abstract

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Rajesh P. Gunaga , R. V. Ganiger , D. A. Smita , Panjabrao Shinde , A. D. Rane

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M. Hanumantha , Rajesh P. Gunaga , Roopa S. Patil , Nagaraja , Suma S. Biradar

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Santalum album Linn. is partial ischolar_main parasite in nature and hence requires host plant for its regeneration and establishment. A study was conducted to observe the regeneration status of sandal under different plant ecosystems. Distribution of natural regeneration of sandal was found to be statistically significant among different ecosystems studied. The overall regeneration was highest in medicinal plant garden, followed by natural forest and bamboo plantations. Considering the different stages of plant growth, plants (seedlings) belongs to the class less than one meter height showed maximum count in all the ecosystems with overall per cent of 69.9, followed by plants (saplings) belongs to 1 to 2 m height (26.0%) and least in plants with more than 2 m height (4.2%). The overall result indicated that, regeneration and establishment of sandal is greatly influenced by availability of seed bearing mother plants in the area, seed dispersal agents, host plants and their nature, fire, grazing and browsing, site conditions and degree of protection provided.

Keywords

Gungaragatti, Ecosystem, Regeneration and Sandal

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Rajesh P. Gunaga , H. Nagesh Prabhu , T. Surendra

Abstract

Variation for seedling performance was investigated among five broad seed sources of teak (Tectona grandis Linn. f). Significant seed source variation was established for seedling characteristics of heiHht (9.56-16.82cm), basal diameter (2.68-4.40 cm), ischolar_main biomass (0.51-2.33 g), leaf area (21.49-283.68 cm ), sturdiness quotient (0.28-4.37) and quality index (0.36-1.04). The present study indicated that seed sources such as Parambikulam, Nilambur and Konni performed better for seedling attributes. Correlation analysis indicated that seedling diameter was positively correlated with seedling height and total biomass of seedling, while shoot-ischolar_main ratio was negatively correlated with total biomass of seedling and quality index, which indicates that an optimal S:R ratio would substantially increase seedling quality and vigour. Cluster analysis was done to assess phenotypic relationships among the seed sources and the dendrogram revealed three major clusters grouped according to rainfall distribution and altitude.

Keywords

Tectona Grandis, Seed Sources, Seedlings Characteristics, Shoot-ischolar_main Ratio

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Rajesh P. Gunaga , S. S. Wange , A. B. Mirgal , A. D. Rane , S. S. Narkhede , S. G. Bhave

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M. Hanumantha , Rajesh P. Gunaga , Roopa Patil , Suma S. Biradar , Nagaraj

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A.B Mirgal ¹, A.D. Rane ¹, Rajesh P. Gunaga ¹, S.S. Narkhede ¹, S.G. Bhave ¹

Affiliations
1 College of Forestry, Dr. B. S. Konkan Krishi Vidyapeeth, Dapoli-415 712, Maharashtra, IN

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Rajesh P. Gunaga ¹, A. V. Manjunath ¹, S. V. Gunaga ¹, R. Vasudeva ¹

Affiliations
1 College of Forestry, Sirsi, Karnataka, IN

Abstract

No Abstract.

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