Investigation on the breeding indexes of Jatropha curcas L.

Jatropha curcas L.is one of the most important energy trees,but a good variety is necessary for industrialization.Therefore,it is critical to get good varieties and strong seedlings by breeding and planting.By the research of inflorescences,some breeding targets were suggested which are the basis of the breeding in order to increase seed yield,and this provide science reference for seeds production and theory study.Our results show that reproductive and vegetable growth of J.curcas process alternately and blossom several times in a year.It keeps blooming over half a year,and the flowering stage is different in different province,longest in Hainan Province.By the analysis of inflorescence shape,it shows that the plant produces flowers as a racemose inflorescence with a dichasial cyme pattern.Moreover,the number of the female flowers are directly effected by the number of the second grade rhachises(the arborizations on main inflorescence rhachises)in a inflorescence.In addition,the number of the second grade rhachises is significantly negative correlation with the male-female flower ratio(r=-0.57),but significantly positive correlation with the fruits per inflorescence(r=0.92)and not significant correlatively with flowering times.There is significantly positive correlation between flowering stage and flowering times(r=0.83).So,the number of the second grade rhachises and the flowering stage are two important targets for planting and breeding.There are not significantly different among the inflorescence length,the number of the second grade rhachises,the male-female flower ratio and the fruits per inflorescence in different provinces.