International Journal of Modern Biological Research
ISSN: 2053-180X
Vol. 6(1), pp. 9-19, January 2018



Influence of insect flower visitors on leaf parameters and nodulation of progenies of cowpea [Vigna unguiculata (L.) Walp.]

Wisdom Harrison K. HORDZI

Department of Biology Education, Faculty of Science Education, University of Education, Winneba, P. O. Box 25, Winneba, Ghana.

*To whom correspondence should be addressed. E-mail: wisdomhordzi@gmail.com, wisdomhordzi2@yahoo.com.

Received 17 November, 2017; Received in revised form 29 December, 2017; Accepted 04 January, 2018.

Abstract


Keywords:
Pollination, Fluorescence induction kinetics, Progenies, Leaf surface area, Megachile.


The study was conducted to determine the differences in leaf area, chlorophyll induction kinetics and level of nodulation of the progenies of cowpea plants whose flowers were not exposed and visited by any organism (control) and progenies of plants whose flowers were visited by Megachile sp. (experimental plants). Cowpea seeds obtained from the pods developed from control and experimental plants were sown on a plot of land (6 × 15 m) demarcated into 12 smaller plots (blocks) in a random manner. Seeds were sown 1 m between blocks and 0.4 m between hills; and each block was made up of 12 hills and three seeds sown per hole in a hill about 0.025 m deep. At specific ages of the germinated plants, leaf surface area, chlorophyll fluorescence (ChlF) induction kinetics and number of nodules were then determined and compared. Mean leaf area per plant per block, ChlF decrease ratio (Rfd = Fd/Fs) of the leaves and mean number of nodules per block for the progenies of the control and experimental groups were determined and compared with paired t-test. The results obtained show that leaves of the experimental group were smaller, greener and had higher chlorophyll induction kinetics than leaves of progenies of control groups. The experimental plants developed more nodules than the control plants. The findings suggest that Megachile sp. might have probably caused pollination of cowpea flowers visited inducing seeds from the plants with some genetic traits that were transferred to progenies and thus causing differential characteristics in leaf area, chlorophyll decrease ratio and nodulation. It is suggested that further researches be conducted on possible cowpea pollination by Megachile sp. and its detail effects.

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