Effects of varying concentrations of lead (Pb) on growth characteristics, nodule features and total nitrogen content on four varieties of mungbean (Vigna radiata L.)

Date

3-1998

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nina M. Cadiz

Co-adviser

Nerissa K. Torreta

Abstract

A study was conducted to determine the effects of varying Lead (Pb) concentrations (0,5,10,40 and 80 ntM) on growth characteristics, nodule features and total nitrogen content of four varieties of mungbean (ligna radtata L.) namely Pag-asa I, Pag-asa 3, Pag-asa 5 and Pag-asa 7 Seeds of the four mungbean varieties were allowed to germinate and grow for four weeks at the greenhouse of the Institute of Biological Sciences Treatment solutions were applied to one month old plants every other day for two weeks There were three pots with three seedlings per treatment for each variety. A 5x4 completely randomized design was made Plants were harvested after two weeks of treatment Several growth parameters were measured namely shoot and root length, number of pods, shoot and root dry weights, nodule features, total nitrogen content and Rhcolual colonies. Analysis of variance (ANOVA) was performed on the obtained results Treatment means were compared using Duncan's Multiple Range Test (DMRT) The effects of Pb on growth characteristics were not clearly defined Varietal differences in response were noted These include root length, shoot and root dry weights. Varieties PI and P7 had decreased root length while P3 and PS had otherwise. In shoot and root dry weights. all varieties increased except var P3/ While shoot length had increased in all varieties.

Reduction in nodule features like nodule number, size and weight in all varieties were highly affected by increasing lead concentration. Rhizobium count also decreased likewise. Total nitrogen content in all varieties increased. Varietal tolerance to increasing Pb concentrations could be due to the formation of thicker cell wall and synthesis of chelating compounds.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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