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Azamal Husen , Rakesh Khall , S. Nautiyal

Abstract

Diurnal changes in chlorophyll fluorescence features in leaves of three Ficus species (F. nemoralis, F. roxburghii and F. racemosa) grown under nursery conditions were recorded in April 2003 by a portable Hansatech plant efficiency analyzer. Significant variations were observed on chlorophyll fluorescence parameters viz., Fo, Fv and Fm. Further, photochemical efficiency of photosystem (PS) II measured as Fv/Fm ratio, varied with species and with the time of observation. F. roxburghii and F. racemosa showed midday depression in Fv/Fm ratio at late noon hours (14:00 hr). However, in case of F. nemoralis mid-day depression was observed at 12:00 hr. It is therefore concluded that chlorophyll fluorescence features occurrence of mid-day depression in Fv/Fm ratio is species specific and not common phenomenon to all species.

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Azamal Husen , Rakesh Khali , S. Nautiyal

Abstract

Diurnal changes in chlorophyll fluorescence features in leaves of three Ficus species (F. nemoralis, F. roxburghii and F. racemosa) grown under nursery conditions were recorded in April 2003 by a portable Hansatech plant efficiency analyzer. Significant variations were observed on chlorophyll fluorescence parameters viz., Fo, Fv and Fm. Further, photochemical efficiency of photosystem (PS) II measured as Fvl Fm ratio, varied with species and with the time of observation. F. roxburghii and F. racemosa showed midday depression in Fv/Fm ratio at late noon hours (14:00 hr). However, in case of F. nemoralis mid-day depression was observed at 12:00 hr. It is therefore concluded that chlorophyll fluorescence features occurrence of mid-day depression in Fv/Fm ratio is species specific and not common phenomenon to all species.

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Azamal Husen , Rakesh Krall , S. Nautlyal

Abstract

Chlorophyll fluorescence variation studies of five indigenous fodder tree species were conducted at three altitude (640, 1200 and 1800m) in Garhwal Himalayas to find out the photosynthetically most active, photosynthetic efficiency of these species as influenced by altitude as well as to understand the adaptation potential of a species along with altitudinal gradient. Pronounced variation in photochemical efficiency of photosystem II was recorded as Fv/Fm ratio on fully developed leaves in sunny days. Among the tested species Grewia optiva, Bauhinia purpurea, Melia azedarach and Celtis australis showed reduction in Fv/Fm ratio with increasing altitude. However, in Quercus leucotrichophora Fv/Fm ratio increased with increasing altitude. The extent of chlorophyll fluorescence variation at three altitudes was probably due to the habitat specific liking of individual species orl environmental variation has been discussed in the present communication.

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Azamal Husen , M. Faisal Rahman

Abstract

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Azamal Husen , Rakesh Khali , S. Nautiyal , H. C. S. Bhandari

Abstract

The ischolar_maining response of nodal shoot cuttings of Grewia optiva Drummond, as influenced two phytohormones, namely, indole-3-butyrie-acid (Lea) and α-napthalenp Acetic Acid (NAA) applied in three conecntrations (1000 to 3000 ppm) were examined under intermittent mist in vermiculite culture. Assessments on ischolar_maining, sprouting as well as on ischolar_main number and their length on the cuttings were conducted after 25-days of treatments. The highest per cent ischolar_maining (75.56%) and sprouting (73.76%) was obtained from untreated cuttings. NAA 3000 ppm treated cuttings showed the lowest per cent ischolar_maining 08.89%) and sprouting 05.80%) compared to IRA treatments. However, positive response was observed in ischolar_main numbers and their length by the application of IRA and NAA. The possibilities of use nodal of shoot cuttings for raising clonal material of G. optiva, an excellent fodder tree species of mountain regions have been discussed.

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Meena Bakshi , Azamal Husen

Abstract

Net photosynthesis was monitored in coppiced shoot leafy nodal cuttings of Eucalyptus hybrid at different periods during adventitious ischolar_main formation. The cuttings were treated with IBA 2000, 4000 ppm or with talcum powder (Control) and kept under intermittent mist. Significant differences in current photosynthesis of treated and untreated control cuttings were observed throughout the ischolar_maining period. IBA treated cuttings responded better in terms of photosynthetic efficiency as compared to untreated control cuttings. We concluded that current photosynthesis in Eucalyptus hybrid cuttings definitely has some role in ischolar_maining that is masked by auxin application.

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Azamal Husen , Mohinder Pal

Abstract

The effects of stock plant etiolation on ischolar_maining behaviour of stem cuttings taken from one-year-old seedling of Teak (Tectona grandis Linn. F.) were investigated. Except mean shoot diameter, etiolation significantly increased mean shoot length, internodal length, number of coppice shoot, number of leaves, number of nodes and total sugar content of branches. Etiolation increased total soluble sugar content of branches. Studies have shown that etiolation had pronounced effect on per cent sprouting, ischolar_maining, mean number of ischolar_main length and mean number of ischolar_main per cutting. Etiolated cutting have shown 100 per cent ischolar_maining, while nonetiolated (control) cutting under similar condition have given 46.60 per cent ischolar_maining. Application of NAA has significantly decreased ischolar_maining potential of even etiolated cuttings. Stock plant etiolation and NAA have not shown significant interaction on adventitious ischolar_main formation.

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