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<< JRScience Home     Volume 15 No.2   June  2004     << Back to Volume Home

PATTERN OF DEFOLIATION AND ITS EFFECT ON PLANT PERFORMANCE AND BIOMASS PARTITIONING IN ABELMOSCUS ESCULENTUS

Altaf A. Dasti1, Shehzadi Saima1, Aysha Imtiaz1, Kaniz Fatima2 and Saeed A. Malik1

1Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan, Pakistan.

2Department of Botany, Govt. Degree College (W) Multan, Pakistan.

Abstract: Three experiments were performed to examine the effect of defoliation on plant performance and biomass partitioning among different plant modules. Different patterns of tissue removal were used to simulate natural herbivore damage in Abelmoscus esculentus (L.). Plants were subjected to removal of tissues from either a single leaf or throughout the plant. The effect of defoliation on plant performance and biomass allocation was quantified by using Classical Growth Analysis Technique. Both levels of defoliation and patterns of tissue removal effect growth performance of Abelmoscus esculentus. Temporal compensatory changes in relative growth rate were mediated by similar changes in net assimilation rate (NAR). The ontogenetic changes in leaf area ratio (LAR) to defoliation were largely determined by changes in specific leaf area (SLA) rather than  leaf weight ratio (LWR) during the experimental period. All defoliation treatments show initial shifts of biomass from leaves to stems and roots but eventually reached to the level of control (un-defoliated) plants with the passage of time i.e. they show compensatory changes. 

Keywords: Abelmoscus esculentus, biomass partitioning, defoliation patterns, leaf attributes, net assimilation rate, relative growth rate.