Standardization of planting ratio for hybrid seed production in Indian mustard Brassica juncea (L.) Czern. Coss.

摘要

A number of cytoplasmic male sterility (CMS) systems are available in Indian mustard. These systems are expected to play important roles in hybrid development witi/without appropriate restorer systems in revolutionizing the edible oil market in future.The production of hybrid seed is an important aspect in extension of hybrid seed technology. The planting ratio is very crucial for making hybrid seed available to the farmers on a very competitive rate by optimizing the seed yield in Indian mustard. The results of the present study showed significant differences in seed yield per plot in different row positions. The first two rows nearest to the pollen parent rows had the highest seed yield and the central rows had the lower seed yields. The declining trend in seed yield towards the central rows was not observed in case of Ogura and Moricandia (chlorotic). The maximum seed yield of Moricandia (green) and Ogura was obtained in 8:2 (15.75q/ha) and 16:2 (16.32q/ha) planting ratios respectively. It is thus suggested to follow a planting ratio of 8:2 in Moricandia (green) and 12:2 or 16:2 in Ogura based CMS hybrid seed production.The usefulness of undertaking seed production in different planting ratios for promising CMS lines is also advocated.