Abstract: The aim of this study is identify deeply phenotype characters and heterosis in parents and their cross generations,and identify the realationships with one′s parents characters.Experimental matter of two types of genotypes with mid2high stalk and short stalk of castor cross combination (parents:CS2R6,CS2R181 and CS2R63,CS2R268;hybrids:CSR61181F1,CS2R61181F2and CS2R631268F1) were studied1Over2parent heterosis is the best method to measure heterosis of castor1Thorugh field experiment,there were measuring dry matter accumulation spead of over2ground,distrubition ration of vegetative mass and reproductive organ,heterotic index of 13 agronomic performance parameters tested and ect,The result indicated that Dry matter accumulation of CS2R61181F1and CS2R61181F2were more than their parents during the various growing phases,but for CS2R61181F2dry matter accumulation less than CS2R61181F11This result indicated that hybrid generation expressed significant heterosis in invegetaion growth1In all growing perid quanlityof dry matter accumulation of CS2R631268 F1with short talk was close to itsfemale parent (CS2R63) with late maturity,expect in harvest1The distribution ratio of the dry matter in vegetative mass and reproductive organ indicated that distribution ratio of reproductive of CS2R61181F1was 7419% at havest,which was slightly more than its male parent (CS2R181 7414%),but for CS2R61181F2,It was 79136 %,and was close to its female parent (CS2R6 80100 %) 1So we concluded that stalk and leaves of hybrid generation (CS2R61181) had still accumlated dry matter until harvest1For CS2R631268F1with short stalk dis2tribution ratio of dry matter in reprodubtive organ goes steadity up during the growing period,until the harvest period,which time the distribution ratio was 97161 %,which was close to its male parent (CS2R268 97118 %),but itsfemale parent (CS2R63) was 73176 %1According to above data,CS2R61181F1heterosis belong to a generative2somatic substance of types,but CS2R631268F1heterosis belong to generative of types1Two types of castor bybrids had significant different in expression of heterosis1CS2R61181F1with mid2high stalk represented over-high-parent heterosis in all of 13 a2gronomic character in ha2rvest peroid,including plant height (15183 %),dry stalk weight (14125 %),dry leaf weight (8151 %),seeds weight of per plant (14168 %),100 seeds weight of first branch spike(12103 %),seed weight in main spike (11123 %),proportion of capsule coat in main spike(1416%),proportion of capsule coat in first branch spike (10175 %),100 seeds weight of main spike (6198 %),100 seeds weight of per plant (3195 %),crude fat content of seeds in main spike (9154 %),crude fat centent of seeds in per plant (7130 %),and crude fat content of seeds in first branch spike (5119 %)1The CS2R631268 F1with short stalk represented over2high2parent2heterosis in 7 agronomic character,including seeds weight of main spike (11101 %),proportion of capsule coat in main spike(6197 %),crude fat content of seeds in first branch spike (3141 %),proportion of capsule coat in first branch spike (313 %),seeds weight of per plant (2145 %),crude fat content of seeds in per plant (0124 %),crude fat content of seeds in main spike (012%),and over2mid2parent heterosis in 3 agronomic character,including 100 seeds weight of first branch spike (20147 %),100 seeds weight of per plant (15198 %),100 seeds weight of main spike (8108 %),and over2low2parent heterosis in 3 agronomic character,including weight of dry stalk (32106 %),weight of dry leaf (15193 %),plant height (11121 %) 1CS2R631268F1 having many excellent character coming from their parents,were fit for dense sowing and mechanized farming1The heterosis of castor had began to decline from F2generation,and unfit for planting

Key words: Castor, Hybrid, Heterosis

CLC Number: 

• S55.02