000			01952nam a2200229Ia 4500
008			220216s9999 xx 000 0 und d
100			_aRay Debabrata
245		0	_aVariability in cold tolerance in Hevea brasiliensis seedlings : Plausible source for crop improvement
260			_bJournal of Plant Biology _c2003
300			_a19-22
520			_aHevea brasiliensis, a highly cross-pollinated tree species, produces seeds of diverse genetic constituents. To exploit the readily available genetic variability, seedlings were grown at experimental station in Tripural. Two-month-old seedlings showed distinct variability in growth parameters such as plant height, shoot diameter and leaf expansion rate during winter season. On the basis of these parameters, a few seedlings with variable growth parameters were selected for further studies to evaluate their intrinsic capability to withstand low temperature. High vigor (HV) seedlings recorded significantly higher mean plant height, shoot diameter, leaf expansion rate compared to low vigor (LV) seedlings. Further, the CO2 assimilation rate and stomatal conductance recorded in LV seedlings were 65;and 15;less respectively, compared to HV seedlings. In a separate experiment in vitro, the degradation of chlorophyll was 7;over control in HV types whereas 33;lower in LV types when the excised leaves were exposed to low temperature of 10oC for two days. Low temperature of the same severity and duration had caused 57;and 41;membrane injury in LV and HV plants respectively. In the same experiment, LV seedlings had recorded 54;more anthocyanin accumulation compared to other types.
650			_aAnthocyanin accumulation
650			_aChlorophyll degradation
650			_aHevea brasiliensis
650			_aLoe temperature tolerance
650			_aMembrane damage
650			_aPhotosynthetic rate
700			_aDas Gitali
700			_aDey S K
700			_aRaj Shammi
942			_cJS
999			_c72080 _d72080