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Studies on F2 and First Backcross Population of Interspecies Brassica Crosses

A. Bhattacharjee,

L.Rahman,

A.Z.M.K.A. Chowdhury,

M.M.H. Chowdhury

M.J. Hasan
PSO
Hybrid Rice Division, Bangladesh Rice Research Institute, Gazipur-1701

Dr. Md. Jamil hasan
Principal Scientific Officer
Head Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

In this study six parental lines/ varieties, 7 F₂ populations and 7 BC₁ generations from different interspecies crosses were used. Pollen sterility, number of siliquae per plant, siliqua length, number of seeds per siliqua, shattering percentage after 15 days of harvest and yield per plant were studied. The investigation revealed that the pollen sterility of F₂ did not exceed the parentage range. The average number of seeds per siliqua was 13.27 and the percentage of siliqua shattering of F₂ after 15 days of harvest (7.73%) was within the range of parents. The mean seed yield per plant of F₂ was lower when compared the average of both the parents but the co-efficient of variation was very high (143.32%) and the range was 0-31.8g. In F₂, it was observed that more pairs of characters were significantly and positively correlated than that found in their respective parents. Only one negative significant association was observed between pollen sterility and siliqua shattering percentage after 15 days of harvest. The results indicated that the interspecies cross between B. napus and B. campestris through these two genotypes would result into faster development of improved varieties through better combination effect.

Keywords: F2 population, BC1 generation, Brassica

Location: The experimental farm of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Start Date: 07-10-1995

End Date: 28-02-1996

Program Area: Variety and Species

Commodity: Mustard

Objectives:

The study was designed to cover the following objectives: -to determine the variations obtained in the population of F₂ and BC₁ materials of interspecies crosses and to estimate the relative degree of association between pairs of characters in different types of populations.

Methodology:

Six parental lines/ varieties, 7 F₂ populations and 7 BC₁ generations from different interspecies crosses were used for the study. The soil of the experimental area belongs to AEZ 9 (The Brahmaputra Alluvial Soil Tract of Bangladesh) with PH around 6.5. The area was non flooded medium high and soil was sandy loam in texture. Four ploughing and cross ploughing followed by laddering were given during land preparation to ensure good tilth. Fertilizer was applied at a rate of 5000: 200: 160: 70: 140: 5 kg/ha as Cow dung, Urea, TSP, MP, Gypsum and Zinc Sulphate respectively. No specific design was followed due to unequal number of seeds and thus materials were sown in plots of variable sizes.Intercultural operations such as weeding, application of irrigation, insecticides etc were done uniformly when necessary in order to maintain uniform conditions.

Source of Information: International Journal of Sustainable Crop Production, 3(3):1-5 May 2008

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In F₂ population of the cross of Nap-3 x Sampad indicated that pollen sterility decreased the shattering percentage at 1% level. Number of siliquae per plant was found to be positively and significantly correlated with siliquae length, number of seeds per siliqua, 1000 seed weight and seed yield per plant. The longer siliqua significantly increased the number of seeds per siliqua and seed yield per plant. Number of seeds per siliqua was highly and positively correlated with seed yield per plant. Similar relationship was found in case of 1000 seed weight and seed yield per plant

Knowledge Management: Journal