Assessment and impact of biparental mating in Brassica campestris L. var. brown sarson.

摘要

Six sets of biparental (BIP)-1 progenies and their best selected recombinants in BIP-1-S3 generation of brown sarson (B. campestris var. sarson) were studied in New Delhi, India, for 9 (height and length of main axis, number of siliquae on main axis, number of primary branches, number of secondary branches, number of seeds per siliqua, days to flowering, seed yield per plant and percentage oil content) and 8 (biological yield, seed yield, harvest index, percentage oil recovery, oil yield per hectare, days to flowering, days to maturity and total number of days available for seed filling stage) characters, respectively. The estimates of sigma 2m was very low compared to sigma 2f, indicating pronounced genetic differences due to seed parents than pollen parents. However, the estimate of sigma 2fm was comparatively higher, which showed inconsistency of various males over females and vice-versa. The order of dominance was in over-dominance range, which reflected importance of non-additive gene action. A wide range of recombinants for various characters appeared probably due to breakdown of repulsion phase linkages. Higher yielding recombinants showed that shifting of flowering period, increased length of floral axis with higher number of siliqua and increased primary and secondary branches were responsible for higher yield. Plants with high oil content were generally poor yielder. Selected plants progenies for yield and oil content indicated that both had intermediate biomass production but higher than early parent and harvest index was comparable to early parent and better than the national control. High oil yielding progenies showed 43% oil recovery through press expeller compared to 33-35% among the parents and national control. High yielding plant progenies were superior to their parents and the national control for yield and oil recovery per hectare.