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Flowering and Reproductive Efficiencies in 30 Elite Groundnit Mutants

M.M.A. Mondal
Bangladesh Institute of Nuclear Agriculture P.O. Box-4, Mymensingh Bangladesh

M.A. Hamid
Bangladesh Institute of Nuclear Agriculture P.O. Box-4, Mymensingh Bangladesh

Abstract/ Executive Summary:

The study assessed reproductive efficiencies (RE) and reproductive efficiency methods (REM) in 30 developed groundnut mutants. Daily flowering pattern of the tested genotypes followed uni-, bi-and tri-modal peaks, with bimodal being the highest number irrespective of flowering peaks. All the higher yielding mutants produced higher rates of flowers within 60-70 days after sowing (DAS). Reproductive efficiency methods used for varietal discrimination for reproductive efficiency, and the RE's effects on yield qualified REM I and REM II equally effective with REM IV as they enabled highest, higher or lower RE scorers with the same order of their yielding ability. The reproductive efficiency method REM IV appeared just reverse of REM II in RE scores of most genotypes due to their parallel reverse estimating formulae, conforming the possible replacement of the former by the latter method. REM III did not reflect RE core in attaining yield. Future increase in ground nut yield could be accomplished by developing cultivars which produce higher rate of flowering within 60-70 DAS with high RE scores and REM I and REM II could effectively be used in future efforts.

Keywords: Flowering and reproductive efficiencies, Elite groundnut mutants, Yield

Location: Bangladesh Institure of Nuc1ear Agriculture (BINA), Mymensigh

Start Date: 00-00-1985

End Date: 00-00-1986

Program Area: Variety and Species

Commodity: Ground nut

Objectives:

To assess the reproductive behavior in flowering pattern and reproductive efficiency and reproductive efficiency methods on thirty developed mutants of groundnut.

Methodology:

Pot experiments were conducted at the Bangladesh Institute of Nuclear Agriculture (BINA), Mymensigh during Kharif-l season of 1995 and 1996. Thirty mutants (including two released varieties) of groundnut (Arachis hypopaea L.) developed at BINA, belonging to the spanish group, were used. Randomized complete block design was followed with 3 replications. Eight kilogram sandy loam soil was used as growth media in the pots (30 cm x 15cm x 35 cm) after well mixing thoroughly with the given amounts of urea, triple super phosphate and muriate of potash at the rate of 0.75, 1.5 and 1.2 gm / pot corresponding to 50, 150 and 120 kg/ha, respectively, Five seeds were sown in each pot on 15th April, 1995 and 10th March, 1996 at a depth of 3 cm and finally thinned to one seedling after 15 days of emergence. Intercultural operations such as watering, weeding, mulching etc. were followed as and when necessary. The total number of flowers produced per plant was determined by recording the daily flower counts from the day at which flowering initiated in each plant up to final harvest for each genotype within replications. All the plants under the three replications were harvested at a time, 135 and 130 days after sowing for experiment-l and 2, respectively. Mature pods were separated from immature pods, which were identified by their shriveled seeds. The total numbers of mature and immature pod and seeds were counted and weighed. With these data, reproductive efficiencies and reproductive efficiency methods were calculated.

Source of Information: Bangladesh J. Nuclear Agric. 14: 35-44, 1998; ISSN 0258-7130

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Reproductive efficiency methods used for varietal discrimination for reproductive efficiency, and the RE's effects on yield qualified REM I and REM II equally effective with REM IV as they enabled highest, higher or lower RE scorers with the same order of their yielding ability. The reproductive efficiency method REM IV appeared just reverse of REM II in RE scores of most genotypes due to their parallel reverse estimating formulae, conforming the possible replacement of the former by the latter method. REM III did not reflect RE core in attaining yield. Future increase in ground nut yield could be accomplished by developing cultivars which produce higher rate of flowering within 60-70 DAS with high RE scores and REM I and REM II could effectively be used in future efforts.

Knowledge Management: Journal