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Pollen Viability and Pollen Tube Growth of Lablab Bean (lablab Purpureu S (l.) Sweet Genotypes

M. ZASHIM UDDI N
Horticultural Research Farm, Bangladesh Agricultural Research Institute, Gazipur

A.R. CHOWDHURY
Bangabandhu Sheikh Mujubur Rahman Agricultural University, Salna, Gazipur

M.M. HOSSAI N
Bangabandhu Sheikh Mujubur Rahman Agricultural University, Salna, Gazipur

M. ZAKA R IA
Bangabandhu Sheikh Mujubur Rahman Agricultural University, Salna, Gazipur

Abstract/ Executive Summary:

Pollen viability and pollen tube growth of four genotypes of lablab bean, Lablab purpureus (L.) Sweet associated with poor pod setting beyond Winter season was investigated. Four genotypes, namely IPSA Sheem-1, IPSA Sheem-2, BU Sheem-3 and JER were evaluated during September 2000 to December 2001 covering one main season (Winter) and two off-seasons (early Summer and late Summer). The pollen viability in acetocarmine and in vitro germination was tested. Compared to off-seasons. all the genotypes performed better for all the parameters during Winter. Every delay in planting was associated with appreciable reduction in pollen viability due to adverse effect of environmental factors. The optimum temperature for maximum pollen grain germination and pollen tube growth was 25°C.

Keywords: Lablab bean, Pollen viability, In vitro pollen germination, Pollen tube growth, Lablab purpureus

Location: Gazipur

Start Date: 01-09-2000

End Date: 31-12-2001

Program Area: Knowledge Management

Commodity: Country bean

Objectives:

To find out the suitable temperature prevailing i n different growing seasons for successful pollination and fertilization of lablab bean.

Methodology:

The investigation was conducted at the Horticultural Research Farm as well as in the Tissue Culture Laboratory of Bangabandhu Shikh Mujibur Rahman Agricultural University, Gazipur with four lablab bean genotys - IPSA Sheem-1, IPSA Sheem-2, BU Sheem-3 and JER (one parent of other three genotypes) during September 2000 to December 2001 covering three main seasons: Winter (October - January) and two off seasons, early Summer (February - May) and late Summer (June - September). The soil of the experimental field was clay loam in texture and acidic in nature with pH of 5.8. The daily average temperature, daily average relative humidity and monthly rainfall of the three seasons were (a) Winter: 21.94°C, 70.80% and 13.17 mm, (b) early Summer: 27.96°C, 72.02% and 205 .98 mm and (c) late Summer 29.96°C, 81.06% and 307.22 mm, respectively. The factorial (factor a. four lablab bean genotypes and factor b. three growing seasons) field experiment was laid out in factorial Randomized Complete Block Design with three replications. The parameters associated with embryological processes like pollen viability, pollen size, pollen grain germination, pollen tube growth were recorded. The data were statistically analyzed with the help of computer "MSTAT-C" program following Complete y Randomized Design . The differences among the means were compared by Duncan's Multiple Range Test (DMRT).

Source of Information: J. Asiat. Soc. Bangladesh, Sci., 34(1 ): 25-39, June 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Findings of the present investigation lead to conclude that the genotypes differed significantly from one another regarding embryological traits. The growing seasons have profound influence on embryological characters of the genotypes . Temperature, rainfall and relative humidity have immense influence on pollen viability, pollen germination , and pollen tube growth. The optimum temperature for pollen germination and pollen tube growth has been found to be 25°C in lablab bean genotypes

Knowledge Management: Journal