S. Nautiyal , Uma Singh , K. Gurumurti

Abstract

The ischolar_maining response of branch cuttings of Tectona grandis (Teak) did not show significant difference of the effect of cutting position on the crown in the cuttings taken from cutting and seedling raised trees. Only hormonal treatment showed significant effects in the above case, however, cuttings taken from adult tree gave good response in both the cases (position of the cutting on the crown as well as hormonal treatment). Both IAA (Indole 3-acetic acid) and IBA (Indole 3-butlric acid) treatments promoted good ischolar_maining response in all cases. The finding clearly indicate the IDA promotes morc ischolar_maining in terms of ischolar_main number while NAA (Naphthalene aeetic acid) promotes more ischolar_main length.

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Adarsh Kumar , B. B. Gupta , Uma Singh

Abstract

The twin seedlings described is the tirst record of occurrence of polyembryony in Acacia nilotica. The twin seedlings of A. nilotica have been categorised as abnormal seedlings which were not capable of producing a normal plant in due course of time.

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S. Nautiyal , Uma Singh , K. Gurumurti

Abstract

The experiments on ischolar_maining response of branch cuttings of teak, collected from seedlingraised, cutting-raised young and mature trees was conducted in the yur 1986-87. The effect of season and growtb bormones was examined for these three types of cuttings. Seasonal effect was found most important factor in response of callus formation and ischolar_main Initiation. In all cases, maximum ischolar_maining response was observed in May planted cuttings While no ischolar_maining was initiated during winter months. Hormone treatments were found to induce both callus and ischolar_main formation considerably in comparison to untreated cuttings. The best ischolar_maining was seen in IDA 100 treated
cuttings while this auxin in higher concentration (200 ppm) initiated maximum callus formation. Overall ischolar_maining response waS maximum in the cuttings obtained from the seedling-raised trees and cutting raised young trees, and the minimum in the cuttings taken from old trees.

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Uma Singh , Adarsh Kumar

Abstract

No abstract

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Uma Singh , C. K. Purohit , T. S. Sachdev

Abstract

Madhuca latifolia (Mahua), is an important tree species in the tribal belts of India. It is characterised by slow growth. Studies were therefore Conducted to stimulate height and dry matter production using various phytohormones in different concentrations. It was observed Gibberellic acid (GA), Indole butyric acid (IBA) and Indole acetic acid (IAA) all promoted both height and dry matter production when applied as spray treatmant. The effect was most pronounced when the hormones were applied in the month of February, i.e. at the beginning of the growing season. Though all the phytohormones promoted dry matter production, different hormones caused differential response. Thus, GA 1000 ppm increased the dry matter production by over 64 per cent as compared to control. IBA showed direct concentration response with regard to dry matter production the increase being over 25 per cent at 1000 ppm. IAA at all concentration though bought about increased dry matter production, caused inverse concentration response. Thus, IAA 200 ppm increased the dry matter production by only 2 per cent. Differential concentration response by application of dilferent hormones in enhancing the dry matter production is discussed. It is concluded that various phytohormones, particularly GA, can effectively be used to enhance the growth in this slow growing plant.

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