| 【Objective】 Natural rubber is an important industrial raw materials and strategic materials, and played a
very important role in national economic development. As a resource constraint industry, it was mainly produced by Brazilian
rubber tree (Hevea brasiliensis) and it has the highest yield and the best quality among the mankind known rubberproducing plants. Harvesting latex is the main economic purpose of Brazilian rubber tree, latex yield is a quantitative trait
controlled by minorgene, with many influencing factors, and its phenotypic value is affected by heredity and environmental effect. To determine the relationship among the yield and agronomic traits of the wild germplasm resources of Hevea
brasiliensis, this study provides a scientific basis for the evaluation and screening of rubber tree germplasm resources and the
selection and breeding of new varieties. 【Method】The yield, growth and other related agronomic traits of 13 wild germplasm
resources of Hevea brasiliensis planted in the experimental field of Chinese Academy of Tropical Agricultural Sciences (CATAS)
were studied and analyzed by grey relational analysis.【Result】The results showed that the association order of the eight main
agronomic traits related to the dry rubber yield per plant were stem girth, dry rubber c ontent, average number of laticifer cells,
average number of laticifer columns, bark thickness, mean stem girth increment, lateral vein latex grade and gum value ratio,
and the weights of each trait were 0.1380, 0.1338, 0.1322, 0.1264, 0.1205, 0.1182, 0.1178, 0.1143. In summary, stem girth, dry
rubber content, quantity of laticifers bark thickness and other traits are closely related to and have a great impact on dry rubber
yield per plant.【Conclusion】Among the main agronomic traits, the stem girth, dry rubber content and quantity of laticifer
should be paid more attention on the evaluation of rubber tree germplasm resources, at the same time the potential impact of
other traits on yield also need to be laid some stress on. |
