000			01783nam a2200181Ia 4500
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100			_aDey S K
245		0	_aDifferent sink : Source relationships existing in rubber (Hevea brasiliensis) during different months in the North East Indian climatic conditions
260			_b2nd International Congress of plant physiology on sustainable plant productivity under changing environment 8-12 January, 2003, New Delhi
520			_aThe factors contributing towards low and high rubber yield during May and November in Hevea brasiliensis were studied by analyzing the sink strength of high yielding Hevea clones. Yield is generally low during summer months and high during winter months in this region. The major yield components like initial flow rate, dry rubber content and plugging index showed a wide difference in both the months/seasons. High temperature prevalent during May causes early plugging and stoppage of latex flow by way of reducing the total yield. However, low temperature during November prolongs the flow of latex due to delay in plugging favouring high yield. The stored carbohydrate pools of bark (tree trunk) and sugar in latex were high during May indicating inability to utilize the available resources. Reduction of storage and low sugar in latex and subsequent increase in photosynthetic rate duting November indicates higher utilization of photosynthates due to high sink demand. In general, the yield of rubber is limited more by sink capacity during May and source capacity during November in the North East Indian climatic scenario.
650			_aFlow rate
650			_aPlugging index
650			_aRubber content
650			_aSink
650			_aYield
856			_uAbst only. Reprint
942			_cJS
999			_c57177 _d57177