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GENETIC CONTROL OF HUSKED NUT WEIGHT IN COCONUT (Cocos nucifera)

Author:

W. M.U. FERNANDO

COCOS, LK
About W. M.U.
Coconut Research Institute, Lunuwila, Sri Lanka.
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Abstract

The genetic control of husked nut weight in Coconut (Cocos nucifera) was
investigated using a full-diallel cross including eight parents. The parents were a
selected sample of palms which gave an annual mean yield of 23 kg of copra per
palm with 713 gm of husked nut weight over five years. An average of five
progenies per cross planted in a fully randomised design were evaluated for five
years. Husked nut weight of five nuts per palm was recorded at each pick.
Analysis of variance of mean husked nut weight confirmed the presence of
additive and non additive genetic variance. The non additive genetic component was
found to be higher in magnitude than the additive component. The heritability
expressed as the ratio of the genetic variance to the total phenotypic variance was
0.45. Of the dominance components, directional dominance was non significant.
Neither the presence of heterosis nor inbreeding depression was consistent among the
selfed and crossed progenies elucidating the fact that not only crossing but selfing
could also improve the trait, depending on the genetic constitution of the individual.
Reciprocal differences were evident in the crosses suggesting the importance of the
direction of cross.
How to Cite: FERNANDO, W.M.U., (2010). GENETIC CONTROL OF HUSKED NUT WEIGHT IN COCONUT (Cocos nucifera). COCOS. 11, pp.1–6. DOI: http://doi.org/10.4038/cocos.v11i0.2154
Published on 10 Aug 2010.
Peer Reviewed

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