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In experiment farm of the Rice Research and Training Center, (RRTC),Sakha, Kafr elsheikh, Egypt, during the period 2013 and 2014 rice growing seasons ,the present investigation was aimed to evaluate some panicle characters of some local and exotic rice cultivars under normal and drought conditions. These cultivars were ,i.e., Giza177, Giza 178,Sakha102, Sakha 104, Sakha 105, Sakha 106, Nishihikari, IET 155, IET1335, Suwoan 104, Milyang 109, Suwoan 332, BG 35-1, WAB 56-104, IRAT 170 and GZ-9057-6-3-. A strip plot design with three replications was used. Phenotypic correlation was used to interpret the ranking of importance of panicle characters to grain yield. The results should that there was significant differences among cultivars under study for the panicle characters under both normal and drought conditions. The drought stress condition decreased significantly number of panicles per plant, panicle length, panicle weight, number of primary branches/panicle and number of secondary branches/panicle. Sterility % was found to be high under drought condition and this conditions caused a significantly reduction in grain yield. WAP 56-104 cultivars proved to possess useful traits associated with water stress tolerance such as number of panicles/plant, panicle length, number secondary branches/panicle, number of filled grains/panicle and grain yield per plant comparing with the other cultivars in both seasons, while Sakha 105 cultivar gave the lowest number of panicles/plant in both seasons. Milyang109 gave the shortest panicle in both seasons. The lowest sterility percentage was found in case of Nishihikari in the two seasons .The interaction between cultivars and growing conditions under study had significant effect on most tested characters except 1000-grain weight in both seasons. On the other hand, different estimates of either positive or negative correlation coefficients between and among studied panicle characters and with grain yield were found under both normal and drought growing conditions, in the two seasons of study. In addition, the mean values of all the studied characters were significantly affected by rice cultivars and growing conditions, the value of these characters increased under normal conditions and decreased under drought conditions except Sterility %. But some cultivars had useful characters associated with drought tolerance like WAP 56-104 under this study.

SENSITIVITY OF PANICLE CHARACTERS OF RICE (ORYZA SATIVA L.) TO DROUGHT STRESS AND THEIR ASSOSIATION WITH GRAIN YIELD