Uptake and distribution pattern of applied abscisic acid (3H-ABA) in normal and hypernodulating soybean varieties &l | [Pakistan Journal of Agricultural Research • 2010]

Author(s):

1. Muhammad Asim: Pakistan Agricultural Research Council (PARC), Islamabad, PAKISTAN

2. Muhammad Asif: Pakistan Agricultural Research Council (PARC), Islamabad, PAKISTAN

3. Muhammad Munir: Pakistan Agricultural Research Council (PARC), Islamabad, PAKISTAN

4. Muhammad Aslam: Ministry of Food and Agriculture, Islamabad, Pakistan

Abstract:

The uptake and distribution of abscisic acid (ABA) were studied in inoculated and uninoculated plants of soybean [Glycine max (L.) Merr.] from the time of inoculation to root-nodule initiation (192 hours after inoculation). 3H-ABA was applied to the leaves of two soybean cultivars: cv. Williams-82 and its hypernodulating mutant, NODI-3. There was a significant difference in the percent uptake of 3H-ABA between the two varieties both in inoculated and uninoculated plants. A marked difference in the percent distribution of 3H-ABA between different parts of the plants was observed at different developmental phases of root nodules. Leaves of NODI-3 retained more radioactivity as compared to Williams-82 in inoculated as well as uninoculated plants. The stem and roots of Williams-82 plants had a percent distribution of ABA that was higher than NODI-3. The phloem sap of Williams-82 had higher accumulation of 3H-ABA at all stages after treatment. The basal levels of ABA in phloem sap were lower in NODI-3 than in Williams-82. Inoculation further accentuated this difference. The major changes in ABA level in phloem sap and leaves occurred between 48 to 96 h after inoculation.

Page(s): 31-36

DOI: DOI not available

Published: Journal: Pakistan Journal of Agricultural Research, Volume: 23, Issue: 1--2, Year: 2010

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