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EVALUATION OF F1 HYBRIDS IN CASHEWNUT (Anacardium occidentale L.)

KrishiKosh

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Title EVALUATION OF F1 HYBRIDS IN CASHEWNUT (Anacardium occidentale L.)
 
Creator MAJJIGA SREENIVAS
 
Contributor M. LAKSHMI NARAYANA REDDY
 
Subject randomized block design ,morphological, flowering and fruiting characters, assessing correlation
 
Description An investigation was carried out to evaluate F1 hybrids of cashewnut at Cashew Research Station, Bapatla during the year 2012-13. Eight hybrids each in three age groups were taken for evaluation against the standard check BPP 8 of corresponding age. The three sets were of 7, 12 and 14 years age. The experiment was conducted in randomized block design with three replications with the objective of evaluating the F1hybrids on morphological, flowering and fruiting characters, assessing correlation between yield and its attributes and estimating the extent of heterosis for important traits.
Morphological parameters like tree height, stem girth, canopy spread recorded significant differences among the hybrids under local agro-climatic conditions of Bapatla. Out of 24 hybrid genotypes 15 showed early season flowering and the rest showed mid season flowering. Stem girth and canopy spread were in close association with number of branches and total number of flowers as well as number of hermaphrodite flowers per panicle and ratio of hermaphrodite to male flowers in many of the hybrids for example H 94 in set I, H 200 in set II and H 313 in set III. High yielding hybrids like H 94 in set I, H 180 in set II and H 313 in set III were found to have maximum ascorbic acid and tannin content in their apples. The nut yield per tree was found to be highest in the hybrids H 94, H 85 in set I, H 180, H 200 in set II and H 313, H 306 in set III. Individual kernels weighing more than 2 g were observed in the hybrids viz., H 94, H 85, H 200 and H 313 which were also good in nut yield per tree. However, all the hybrid genotypes under study produced medium sized kernels (kernel weight ranging between 1.2 g and 2.5 g) except only two (H 328 and H 338 in set III) which had low kernel weight (less than 1.2 g).
Phenotypic and genotypic correlations among yield and its attributing characters showed that nut yield was found to have positive and significant correlation with tree height, stem girth, mean canopy spread, flowering laterals per m2 canopy, panicle length, primary branches per panicle, hermaphrodite flowers per panicle, fruits set and fruits retained till maturity. Genotypic path co-efficient analysis revealed that apple weight exhibited high and positive direct effect on nut yield followed by number of hermaphrodite flowers per panicle. Nut yield showed positive heterosis in six crosses (H 77, H 85, H 94, H 95,H 116 and H 117,) over mid parent, five crosses over better parent (H 77, H 85, H 94, H 116 and H 117) and only two crosses (H 85 and H 94) over standard check among the hybrids of set I. In set II and set III, seven crosses (set II: H 180, H 187, H 193, H 194, H 200, H 203, H 206; set III: H 298, H 303, H 306, H 313, H 319, H 328 and H 338) had positive heterosis over mid parent and two crosses showed heterosis over standard check in set II: H 180 and H 200; and five over standard check in set III (H 303, 306, H 313, 319, 328 and 338). Maximum heterosis for nut yield per tree was registered by the hybrids H 94 (set I), H 200 (set II) and H 313 (set III). The present study revealed that the cross combinations H 200 and H 313 showed heterosis at early age and can be studied further for any possible improvement in the same.
 
Date 2016-07-26T14:59:26Z
2016-07-26T14:59:26Z
2014-07
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69942
 
Language en
 
Format application/pdf
 
Publisher Dr. Y. S. R. HORTICULTURAL UNIVERSITY