000			01741nam a2200205Ia 4500
008			220216s9999 xx 000 0 und d
100			_aPremakumari D
245		0	_aComparative bark anatomy of drought tolerant and susceptible clones of Hevea brasiliensis
260			_bIndian Journal of Natural Rubber Rsearach _c1993
300			_a14-Oct
520			_aIn the Para rubber tree summer drop in yield is observed in many cultivars. This is a clonal characteristic mediated through latex flow pattern, which in turn is governed by several other factors. As structural parameters have strong bearing on clonal performance, a study was made to compare some drought tolerant and susceptible clones for bark anatomical characters. Six clones, three showing drought susceptibility and the other three drought tolerance, were chosen for the study. Significant clonal differences were recorded for the proportion of soft bast (P<0.01), total number of latex vessel rows (P<0.05), proportion of latex vessel rows in the soft bast region (P<0.01>, height of pholic rays (P,o.01), width of pholic rays (P<0.01) and height to width ratio of pholic rays (P<0.01). Significant differences between drought tolerant and susceptible groups of clones were recorded for the proportion of soft bast, proportion of latex vessel rows in the soft bast region, width of pholic rays and height to width ratio of pholic rays. Importance of tolerance have been discussed in the light of theoretical considerations and functional possibilities.
650			_aBark anatomy
650			_aDrought tolerance
650			_aHevea brasiliensis
650			_aIndia
700			_aMarattukalam J G
700			_aPanikkar A O N
700			_aSethuraj M R
942			_cJS
999			_c55913 _d55913