Meena Bakshi , K. S. Thakur , Surinder Kumar

Abstract

Ninety six clones of Dalbergia sissoo were hedged at 30 cm of height level in the month of Jan. - Feb. in VMG at Birplasi, Nalagarh (HP) to assess shoot regeneration capacity of different clones. Significant differences (P> 0.001) were observed among clones regarding days to shoot emergence, collar diameter of cut stumps, shoot number, shoot length and basal diameter of shoots. The earliest shoot emergence (5 days) was recorded in clone 86 and 91 both belonging to Rajasthan. The maximum number of shoots (67) were recorded in clone 107 (Rajasthan) followed by 57 shoots (Clone 42, Gonda), while maximum shoot length (133cm) and diameter (11 mm) was observed in clone 9 (Pathri, Haridwar). A feeble (r=0.68) correlation was observed between collar diameter of stump and number of regenerated shoots.

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San Deep Sharma , Surinder Kumar , K. S. Thakur , P. S. Negi

Abstract

Gooseberry (Ribes orientale Desf.) is an important shrub of higher Himalayan regions and could be a potential species for cold desert areas. A study was conducted to determine the pre-sowing treatment in seeds of this species to overcome dormancy. The ripened berries were collected from Sangla valley in Himachal Pradesh and were immediately depulped and, airdried. Seeds were sown in petridishes in seed germinator after giving various pre-sowing treatments. It was found that the treatment of conc. H₂SO₄ for 1 minute followed by washing and 24 hours soak in cold water excelled others in germination per cent (58%) and germination energy per cent (51 %). This suggests the existence of seed coat dormancy in the seeds of Ribes orientale. Further the increase of germination per cent in best treatment over control was only 24.5% which suggested that the other factors were also responsible for setting dormancy in the species besides hard seed coat which need deeper investigation.

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Sandeep Sharma , P. S. Negi , K. S. Thakur , Surinder Kumar

Abstract

Colutea nepalensis is an important shrub of cold desert areas. A study was conducted to examine vegetative propagation of this species through shoot cuttings. The cuttings were collected from Pooh area of Kinnaur District of Himachal Pradesh during spring and autumn seasons and treated with IBA and IBA in combination with thiamine for induction and growth of adventitious ischolar_mains under intermittent mist in sterilized sand. Assessments on ischolar_maining, sprouting, ischolar_main number, ischolar_main length, shoot number and shoot length on the cuttings were conducted after 120-days of treatments. Of these, IBA treatments significantly promoted adventitious ischolar_maining in shoot cuttings collected during spring but in combination with thiamine failed to produce any synergetic effects on induction and growth of adventitious ischolar_mains. The highest ischolar_maining in that season (96.67%) was obtained from cuttings treated with 0.2% IBA + 0.05% Captan + 0.1% Sucrose. However, treatment of 0.1% IBA + 0.05% Captan+O.l% Sucrose is recommended as most economical treatment for mass propagation of Colutea nepalensis in mist chamber during spring season.

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Rajesh Sharma , Surinder Kumar , K. S. Thakur

Abstract

Pinus roxburghii Sargent (Chir pine) is the most important pine among the six indigenous pines of India. The genetic variation in Chir pine both among and within populations with regard to quantitative and qualitative aspects of inheritance, morphological, physiological, biochemical characters and gene marker studies have been studied in the past, but in isolation. The article reviews the results of various studies on different aspects of tree improvement of the species, specifically highlighting the work on isozyme analysis of the provenances and plus trees to narrow down the population/ provenance differences and their categorization based on genetic diversity, differentiation and genetic distances.

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