Thumbnail Image

Anand Agricultural University, Anand

Anand Agricultural University (AAU) was established in 2004 at Anand with the support of the Government of Gujarat, Act No.(Guj 5 of 2004) dated April 29, 2004. Caved out of the erstwhile Gujarat Agricultural University (GAU), the dream institution of Sardar Vallabhbhai Patel and Dr. K. M. Munshi, the AAU was set up to provide support to the farming community in three facets namely education, research and extension activities in Agriculture, Horticulture Engineering, product Processing and Home Science. At present there seven Colleges, seventeen Research Centers and six Extension Education Institute working in nine districts of Gujarat namely Ahmedabad, Anand, Dahod, Kheda, Panchmahal, Vadodara, Mahisagar, Botad and Chhotaudepur AAU's activities have expanded to span newer commodity sectors such as soil health card, bio-diesel, medicinal plants apart from the mandatory ones like rice, maize, tobacco, vegetable crops, fruit crops, forage crops, animal breeding, nutrition and dairy products etc. the core of AAU's operating philosophy however, continues to create the partnership between the rural people and committed academic as the basic for sustainable rural development. In pursuing its various programmes AAU's overall mission is to promote sustainable growth and economic independence in rural society. AAU aims to do this through education, research and extension education. Thus, AAU works towards the empowerment of the farmers.

Browse

19991
Reset filters
Subject: Genetics and Plant Breeding × Author: Bhatt, Maheshkumar Manilal × End date: 1999 × Start date: 1999 × Thesis Type: Ph.D ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    HETEROSIS AND COMBINING ABILITY STUDIES IN BIDI TOBACCO (Nicotiana tabacum L.) OVER ENVIRONMENTS
    (AAU, Anand, 1999) Bhatt, Maheshkumar Manilal; PATHAK, H. C.
    Twelve (12) elite bidi tobacco genotypes selected from germplasm pool maintained at B.T.R.S., G.A.U., Anand were crossed in all combinations in a diallel mating design excluding reciprocals. The resulting 66 hybrids and 12 parents along with 2 standard checks were grown in two environments (E1 and E2) in Randomized Block Design with three replications at B.T.R.S. Research Farm during kharif 1996-97 and were evaluated for 13 characters pertaining to cured leaf yield and its components, quality traits and disease reaction. The objective of the study was to investigate the mean performance of parents and hybrids, magnitude of heterosis, combining ability variances as an index of gene action, and gca and sca effects for characters under study in individual environments and also on pooled basis. Highly significant differences were observed among genotypes for all the characters in individual environments and also on pooled basis with few exceptions. On pooled basis, ABD 38, Anand 19 and Anand 119 among parents and ABD 38 x 575-28-110, NPN 90 x 575-28-110, ABD 7 x 575-28- 110 among hybrids gave the highest mean cured leaf yield and were also superior for a number of yield components along with desirable quality characteristics. Estimates of heterosis was highly significant for all the characters but the hybrids showed inconsistent behaviour over environments. The highest estimate of heterosis of various kinds were observed for spangle score, followed by leaf curl, leaf thickness, root knot index, cured leaf yield and potash content in that order. A number of crosses showed highly significant magnitude of heterosis, heterobeltiosis and standard heterosis for days to flower, days to maturity, low nicotine content and dwarfness. In general, the parents showing superior performance also gave the superior hybrids and highly heterotic cross combinations. On pooled basis, ABD 38 x 575-28-110, NPN 90 x 575-28-110, ABD 19 X DWFC were the most heterotic for cured leaf yield, several of its components, with desirable quality traits and disease reaction. The results on combining ability, in general, revealed the involvement of both additive and non-additive gene action for cured leaf yield and its components, quality traits and disease reactions. However, the ratio of σ2 sca /σ2 gca indicated the preponderance of additive gene action for cured leaf yield and some of its components in E1 and on pooled basis whereas non-additive gene action was predominant for cured leaf yield and its components in E2 and for quality traits and root knot index in individual environment and also on pooled basis. ABD 38, 575-28-110, Anand 19, ABD 7 and NPN 90 among parents were the best general combiners whereas, ABD 19 x DWFC, NPN 90 x 575-28-110 and BSRA 2 x NPN 90 among crosses exhibited the highest and significant desirable sea effects for cured leaf yield and major yield components, quality characters and disease reactions. Mean squares due to GCA x environment and SCA x environment were non-significant for cured leaf yield and its components and significant for days to flower and maturity. The preponderance of additive gene action under the rainfed environment (E1) suggested that the pedigree method of breeding could be appropriate breeding method for developing high yielding, superior, stable varieties of bidi tobacco for rainfed situation. However, the presence of non-additive gene action for yield components and high magnitude of heterosis for cured leaf yield and other characters under study indicated that the heterosis breeding/cyclic method of breeding could alternatively be employed for the development of superior hybrids/varieties for rainfed condition. Under irrigated condition (E2) preponderance of non-additive gene action for yield and other characters, suggested that heterosis breeding could be more appropriate breeding method for developing high yielding, superior hybrids for irrigated condition. However, presence of substantial additive gene action for yield, its components and quality traits adoptation of cyclic method of breeding could also be used profitably.