Evaluation of Double Cross Derived Lines for Their Combining Ability of Fruit Yield and its Component Traits in Okra (Abelmoschus esculentus (L.) Moench)
KrishiKosh
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Title |
Evaluation of Double Cross Derived Lines for Their Combining Ability of Fruit Yield and its Component Traits in Okra (Abelmoschus esculentus (L.) Moench)
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Creator |
L. Malakannavar
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Contributor |
G. Shanthakumar
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Subject |
Genetics and Plant Breeding
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Description |
Okra is an economically important vegetable crop, has good nutritional value particularly vitamin C (30 mg/100 g), Ca (90 mg/100 g) and iron content (1.50 mg /100 g) in edible fruit. An investigation was made to study magnitude of heterosis, combining ability, path of productivity, heterotic grouping and the evaluation of selected genotypes for disease resistance and iron content. The F1?s were obtained by crossing the ten newly derived inbred lines in full diallel design. Analysis of variance of parents was significant for fruit yield and yield traits. Maximum standard heterosis of 79.59 per cent for fruit yield per hectare was observed in cross 18 x 5, followed by 5 x 37 (67.38%) and 37 x 16 (56.33%) over Pusa Sawani. The crosses like 4 x 5, 5 x 37, 6 x 37, 16 x 2, 22 x 6 and 12 x 6 had maximum standard heterosis for traits like number of fruits per plant, 100-seed weight, number of seeds per fruit, fruit length and number of branches per plant, respectively. The GCA and SCA ratio variance was less than unity for all characters indicating predominance of non-additive variance. Lines 4, 5, 37, and 22 categorized as good general combiners. The crosses 6 x 16, 4 x 37, 13 x 18 were identified as best specific combiners for all traits studied. Path of productivity indicated fruit weight and number of fruits per plant have maximum contribution to yield and double cross predicted per se performance aids in the heterotic grouping i.e., the lines 4 and 13 belong to same group and lines 37 and 18 belong to another group. The lines 4, 6, 13 and 16 showed multiple disease resistance for yellow vein mosaic virus, powdery mildew and alternaria leaf spot diseases and cross combination of 4 x 22, 4 x 5 yielded higher iron content. Best Cross 5 x 37 had Fe (1.30 mg/100 g), moderately resistant to alternaria leaf spot and resistant to powdery mildew. |
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Date |
2016-11-10T16:25:05Z
2016-11-10T16:25:05Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84955
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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