TITLE

Overlap index: a measure to assess flowering synchrony among teak (Tectona grandis Linn. f) clones in seed orchards

AUTHOR(S)
Gunaga, Rajesh P.; Vasudeva, R.
PUB. DATE
September 2009
SOURCE
Current Science (00113891);9/25/2009, Vol. 97 Issue 6, p941
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
One of the most important aspects in a seed orchard is the synchrony among the clones for reproductive phenology. This will decide the extent of random mating among the constituent clones and hence the genetic gain in the resultant progeny. In the present study, synchrony among clones for flowering and peak flowering was estimated through the phenogram as well as through a novel overlap index. Rating of an entire orchard for its relative degree of flowering synchronization is effective with this new measure. The present study was conducted in teak clonal seed orchard (CSO), Manchikere, Karnataka using 25 clones to study the clonal variation for flowering phenology. There are two peak periods in flowering. The first period during early May to July corresponds mainly to the clones of central and southern origin; the second period during July to August corresponding to those of northern origin. Further, these two peaks are also more apparent considering the peak flowering periods of clones. Perhaps, this is the first empirical evidence among the CSOs of teak in India where asynchrony has been documented and quantified through meticulous observations as well as by developing a new index.
ACCESSION #
44774349

 

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