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STUDIES ON POLLINATION REQUIREMENTS IN HYBRID SEED PRODUCTION OF INDIAN MUSTARD [Brassica

KrishiKosh

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Title STUDIES ON POLLINATION REQUIREMENTS IN HYBRID SEED PRODUCTION OF INDIAN MUSTARD [Brassica
 
Creator ANIRUDDHA MAITY
 
Contributor Shyamal Kumar Chakrabarty
 
Subject ---
 
Description T-8516
The overall rapeseed-mustard productivity starting from 1950s till the recent years indicates that whenever a new variety with greater yield potential has been introduced, the production trend has received an inflection point. But the potential of the conventionally bred open pollinated varieties has been exploited to its maximum level resulting in a wider platue in the productivity level, which breeder often called as yield stagnancy. Here we need to exploit the heterosis i.e. hybrid vigour to break the yield platue. In a significant effort, scientists of Directorate of Rapeseed, Bharatpur successfully developed the first ever hybrid (released in 2009), NRC Sankar Sarson (NRCHB 506) through heterosis breeding using Moricandia CGMS system for cultivation primarily in Rajasthan and U.P. The hybrid NRCHB 506 has given 9.4, 14.3 and 12.8 percent higher seed yield over Maya, Kranti and Varuna, respectively in zone III. It has given 17.5, 18.2 and 19.8 percent higher oil yield over Maya, Kranti and Varuna, respectively in zone III. There is a need to develop seed production technology in this hybrid. Seed yield of rapeseed-mustard is mainly affected by prevailing temperature especially at flowering and seed setting. It is important to choose the right time for sowing. Late sown early varieties produce less number of siliqua and early sown late varieties give more leafy growth and produce siliqua very late. Therefore, it is necessary to evaluate the effect of different sowing times on the plant growth, seed yield and quality. Standardization of optimum planting ratio is also essential to facilitate effective pollination and to accommodate more female plants in the seed production plots to get maximum hybrid seed yield. Our present study showed that the optimum sowing time of parental lines of NRCHB 506 is third week of October to get good quality seed of maximum yield. Optimum planting ratio of male to female for hybrid seed production is 2:8. Honeybee population was found in an increasing mode with rise in temperature up to a certain limit, indicating a relatively less bee population in early sowing plants for which flower period coincides with relatively low temperature conditions. Few beehives near the growing field may compensate this deficit in hybrid seed production of mustard in October. Female plants produced seeds of higher test weight under low yield condition. Isolation distance for hybrid seed production in mustard should be standardized. Strict maintenance breeding is must to maintain the genetic purity of the parental lines. Our study emphasised to provide an optimum seed production practice to the seed growers under Delhi conditions.
 
Date 2016-12-01T13:48:08Z
2016-12-01T13:48:08Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/88631
 
Format application/pdf
 
Publisher IARI, DIVISION OF SEED SCIENCE AND TECHNOLOGY