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GrainGenes Reference Report: CRI-30-185

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Reference	CRI-30-185
Title	Genetic divergence in bread wheat
Journal	Crop Improvement
Year	2003
Volume	30
Pages	185-188
Author	Gartan SL Mittal RK
Abstract	Genetic divergence for 9 quantitative characters (plant height, number of effective tillers per plant, number of days to 50% flowering, number of days to 75% flowering, number of days to maturity, spike length, number of spikelets per ear, grain yield per plant and 1000-grain weight) was studied in 68 bread wheat genotypes collected across India and grown in Dhaulakuan, Himachal Pradesh, during rabi 2000/01. The analysis of variance revealed the presence of significant genetic variation for all characters. The genotypes were grouped into 6 clusters. The clustering pattern did not show a definite relationship between genetic divergence and geographical distribution of the genotypes. The greatest genetic distance was observed between clusters V and VI. Cluster I had the highest mean value for grain yield and spike length, and the second highest mean values for number of tillers and early maturity. Cluster VI also recorded the greatest 100-seed and 1000-seed weights. Only 8 genotypes were not infected by powdery mildew (Erysiphe graminis f.sp. tritici). The high-yielding and powdery mildew-resistant genotypes in cluster I (CPAN 4038, HPW 89 and WL 3450) should be crossed with superior and resistant genotypes of clusters II (CPAN 2051, WL 711, GW 527 and HS 295), which can also be crossed with the genotypes in cluster III (PBW 343 and Raj 1707) and cluster V (DWL 5010). Crossing of DWL 5010 and ISWRN 277 (cluster VI) is also suggested. These crosses are expected to produce transgressive segregants for yield and yield components, and resistance to powdery mildew
Keyword	[ Hide all but 1 of 24 ] agricultural research cluster analysis crop yield cross disease resistance flowering flowering date fungal diseases genetic distance genetic variance genetic variation genotype geographical distribution maturity plant diseases plant height plant pathogenic fungi plant pathogens quantitative trait seed weight spikelets spikes tillers yield components

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