Indian Society of Genetics & Plant Breeding

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Detection of biennial rhythm and estimation of repeatability in mango (Mangifera indica L.)

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Most of the perennial crops exhibit biennial rhythm in
fruiting and growth. Among the perennial crops, mango is
an important fruit crop not only in India but also across the
world. This crop acquires bienniality, a complex
phenomenon, by carrying a heavy fruiting in one year called
‘on’ year and little or no fruiting in the next year called ‘off’
year. The presence of bienniality in the data may affect
genetic parameter estimates like repeatability. In this paper,
the extent and intensity of bienniality in mango has been
studied by graphical as well as quantitative approaches.
Besides, a test of significance for bienniality has been
obtained for each tree using binomial distribution. On this
basis, the percentage trees in ‘on’ years and in ‘off’ years
has been quantified for four different locations. Also,
variety-wise biennial rhythm has been studied in these
locations. The results reveal that there exists a moderate to
strong bienniality in mango crop. Besides, the errors
become auto-correlated when bienniality is removed by
taking moving average. Moving average methods have been
applied to estimate the repeatability. The results reveal that
the mango yield was moderate to highly repeatable.
 

Keywords: Bienniality, perennial crops, mango, repeatability, Auto-correlation.

Info

Year: 2016
Volume: 76
Issue: 1
Article DOI: 10.5958/0975-6906.2016.00020.1
Print ISSN: 0019-5200
Online ISSN: 0975-6906

Authors

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A. R. Rao info_circle
S. D. Wahi info_circle
A. K. Misra info_circle

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