000			01694nam a2200205Ia 4500
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100			_aPremakumari D
245		0	_aAssociations of structural traits: yield, girth and occurrence of tapping panel dryness in Hevea brasiliensis
260			_bIndian Journal of Natural Rubber Research _c1997
300			_a27-33
520			_aA correlation study on ten Hevea brasiliensis clones showed that the factors detrimental to girth increment on tapping favours the occurrence of tapping panel dryness. Laticifer area index was an exception which has positive association with both. The number of latex vessel rows, the number of intraxylary phloem groups and total volume of latex produced together contributed to 49 per cent variation in the occurrence of tapping panel dryness of which the two structural traits alone governed 39 per cent variation. The associations of characters indicated that a very high number of latex vessel rows in high yielding clones leads to high incidence of tapping panel dryness. Hence selection based on high girth, good quantity of intraxylary phloem and balanced number of latex vessel rows is suggested for sustainable yield by reducing TPD> The two structural traits mentioned above are useful parameters for early prediction of clonal susceptibility to TPD at least to some extent. The importance of laticifer area index and number of intraxylary phloem groups as selection parameters is discussed.
650			_aAnatomy
650			_aHevea clones
650			_aTapping panel dryness
650			_aYield
700			_aMarattukalam J G
700			_aPanikkar A O N
700			_aSethuraj M R
942			_cJS
999			_c54573 _d54573