African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Effect of environmental factors on hybrid seed quality of Indian mustard (Brassica juncea)

Aniruddha Maity1* and S. K. Chakrabarty2
1Seed Technology Division, Indian Grassland and Fodder Research Institute, Jhansi, UP- 284003, India. 2National Fund for Basic, Strategic and Frontier Application Research in Agriculture, 707, Krishi Anusadhan Bhavan-I, Pusa, New Delhi- 110012, India.
Email: [email protected]

  •  Accepted: 21 November 2013
  •  Published: 12 December 2013

Abstract

The trinity of parental line superiority, climatic conditions during crop growth and effective cross-pollination is the decisive factor to reap best quality hybrid seed. In order to study the effect of environmental factors during sowing time on hybrid mustard seed quality, freshly harvested hybrid seeds from three plots sown on 21st October (D1), 30th October (D2) and 18th November (D3), 2009-2010 were tested for quality traits before and after nine months of ambient storage. Percent germination had strong correlation with Tmax at vegetative (r2=0.881) and seed filling stage (r2=0.88). Sunshine hours at vegetative and seed filling stage had significant correlation with percent germination (0.957 and -0.957 respectively), shoot length (0.898 and -0.870 respectively) and electrical conductivity of seed leachate after accelerated ageing (-0.880 and 0.856 respectively). No significant difference for germination and vigour indices was found between  1st (D1) and 2nd (D2) dates of sowing as the weather conditions during these two sowing periods was favourable and did not fluctuate much. Percent decrease in germination from D1 to D2 was 0.83/°C temperature decrease at vegetative stage and 1.33/°C temperature increase in seed filling stage. But percent decrease in germination from D2 to D3 was 2.31/°C temperature decrease at vegetative stage and 3.66/°C temperature increase in seed filling stage. A predictive model was developed as- Y= 234.545 - 1.688 × (±1.013) × RHpf - 15.359 (±1.335) × SHsf, where, Y= Percent germination, RHpf = relative humidity at peak flowering stage and SHsf= sunshine hours at seed filling stage. Seeds were subjected to accelerated ageing followed by electrical conductivity test after storage. D3 seeds had minimum germination percentage at 96 h ageing (5.1); significantly lower than that from D1 seeds (52.4). Grow out test result suggested standard isolation distance may be reconsidered to check out-crossing in optimum date of sowing. Seeds harvested from 21st October sowing (optimum time of sowing) gave the best result regarding seed quality parameters than that in hybrid seeds from 30th October and 18th November sowings.

 

Key words: Indian mustard, hybrid seed quality, environmental factors, percent germination, predictive model, correlation coefficient.