R. H. Rizvi , V. K. Gupta , S. P. Ahlawat , A. Datta

Abstract

Nine years growth data of Dalbergia sissoo progeny trial established in semi-arid region of Central India was analysed. Significantly high age-age correlations were found for tree traits viz. height, dbh and D2H. Among three traits, empirical model developed for trait index D²H was found to be best fit (adj. R² = 0.931). Using this model, the age-age correlations were predicted and efficiency of early selection in terms of gain per year for different plantation and rotation ages was estimated. For the selection age 12 years and rotation age 40 years, the genetic gain was almost twice. But this model is time dependent and does not take into account the growth rates. Another type of model based on variance ratio and a factor of relative size dependent growth was also applied. Predictions of age-age correlations were found to be better in case of D²H than height and dbh. According to this model, selection of progenies at 9 years age seems reasonably good for the improvement of height of Dalbergia sissoo.

Keywords

Dalbergia sissoo Roxb., Age-age Correlation Models, Semi-arid Region, Central
India

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R. C. Dhiman , S. P. Ahlawat

Abstract

No abstract

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N. S. Bisht , K. Haridasan , S. P. Ahlawat

Abstract

No abstract

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S. P. Ahlawat

Abstract

Plantlets were produced in-vitro from hypocotyl and nodal bud explants of tree legume -Albizia procera. Initially explants were reared for 8 weeks on MS + 0.1-2.0 mg/l either of IAA, IBA, NAA, 2,4-D,BAP KN and in combination of BAP and NAA/IBA. Multiple shoots differentiated directly on the explant and from callus of explant. A combination of MS + 1.0 BAP + 0.5 mg/l NAA gave best differentiation and proliferation of shoots. This combination enhanced shoot proliferation rate 13- 16 fold in 180 days upon serial transfer of cultures. Nodal segments yielded more shoots than hypocotyl explant. Rooting was achieved in ½ MS + IBA 1.5 mg/l + 1.0% activated charcoal. The plantlets acclimatized stepwise and successfully transferred to soil.

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S. P. Ahlawat , S. K. Sharma , Y. P. Singh

Abstract

Past fifty years have witnessed the development and refinement of storage conditions for seeds and other plant parts as a measure of forest tree germplasm conservation. During the last two decades the quest for genetic resource conservation has reached to such a level that existing methodologies require development of an innovative and reliable technology package for the genetic resource preservation. Techniques of in-vitro conservation hold enormous potential, however, extensive and systematic efforts to refine them into technology are needed. To date the research had mainly confined to the temperate species. Tropical forest genetic wealth which is under serious threat of depletion/extinction needs special attention for the development of in-vitro conservation strategies. The paper briefly discuss the recent approaches like in-vitro and cryopreservation technology for genetic conservation ofvaluahle plant resources and highlighted their important role in forest trees.

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R. H. Rizvi , A. K. Bharti , S. P. Ahlawat

Abstract

Six years growth data of Acacia nilotica plantation was compiled and analysedstatistically. Significantly high correlations were found between height and dbh (0.93) and also between canopy diameter and dbh (0.92). Therefore, height-dbh and canopy diameter-dbh relationships have been established for A. nilotica trees. The non-linear models; Ln H=3.813+0.805D^0.267 and CaD=0.438 + 0.396 D - 0.009 D²; where, H-tree height (m), D-diameter at breast height (cm) and CaD- canopy diameter (m) were developed. These models were found good fit on the basis of statistical criteria and may be used for estimating height and canopy diameter of A. nilotica trees in semi-arid region of Central India.

Keywords

Acacia Nilotica, Anamorphic, Model, Height-diameter, Semi-arid

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N. Gurunathan ¹, S. P. Ahlawat ¹, K. Rajarajan ¹

Affiliations
1 National Research Centre for Agroforestry, Jhansi U.P., IN

Abstract

Pongamia pinnata is one of the most promising tree borne oil seed species. Ten better performing accessions mainly based on fruiting were evaluated. Uniform size semi-hardwood cuttings were made and were treated with IBA @ 600 ppm. The cuttings were measured, after 75 days of planting for ischolar_main length, shoot length, collar diameter, fresh weight and dry weight. The shoot length, collar diameter, fresh weight and dry weight had shown significant difference between the sources. Broad sense heritability was highest for ischolar_maining (99.58%) followed by fresh and dry weight. Fresh weight showed high genetic advance. The sources Mundara (Tikamgarh) and Khadauli (Agra) performed better in terms of dry matter production as well as ischolar_maining.

Keywords

Pongamia Pinnata , Performance, Accessions, Cuttings

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