Effect of VAM on drought tolerance and growth of plant in comparison with the effect of growth regulators
2000
Ayub, N. | Bano, A. | Ramzan, S. | Usman, M. (Quaid-i-Azam Univ., Islamabad (Pakistan). Dept. of Biological Sciences)
The present study was carried out to investigate the involvement of VAM and phytohormones under drought stress. An experiment was conducted to evaluate the effect of vesicular arbuscular mycorrhizal inoculation on plant growth and yield under controlled and drought conditions. Plant growth regulators viz. ABA and GA were used in combination with VAM and/or drought, to find out the interactive effect of VAM and phytohormones on plant growth and yield under drought stress. Foliar spray of phytohormones viz. Gibberellic acid (GA) and Abscisic acid (ABA) each at a concentration of 10-6M was made prior to the imposition of first water stress. The treatments including VAM showed better vegetative and reproductive growth than non-VAM plants. The plants which were subjected to foliar application of GA and ABA in combination with VAM (VAM plus ABA and VAM plus GA) gave better yield than VAM alone. The vegetative and reproductive growth was decreased in drought stressed, non-VAM plants as a result of which, shoot and root dry weights and yield were reduced. However, VAM plus Drought plus ABA increased the weight of pods/plant and shoot dry weight/plant. The VAM and foliar application of ABA, helped the plants to increase the yield insignificantly in VAM plus ABA plus Drought and significantly in VAM plus ABA. Foliar application of ABA and GA in the absence of VAM has not been found to be stimulatory to yield.
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