橡胶树优良品种热研73397自根无性系早期产胶及生理特性OA

Planting materials constitute the material basis for ensuring high and stable yield of rubber plantations.The selection of high-quality planting materials can effectively shorten the tapping commencement period,increase the number of productive tapping trees,and thereby improve the overall yield of rubber plantations.To explore the effects of different planting materials on the early yield and latex physiological characteristics of rubber trees,three seedling types of the rubber tree cultivar Reyan 73397,namely juvenile scion budded seedlings,mature scion budded seedlings,and self-rooted clonal seedlings,were used as experimental materials.Under a randomized block design,the dry rubber yield in the 1st to 5th tapping years was systematically determined,and physiological indices including initial latex flow rate,plugging index,latex sucrose(SUC),inorganic phosphorus(Pi),thiol(RSH)and total solid content(TSC)were measured during the 1st to 3rd tapping years.The results showed that:(1)The average dry rubber yield over 1-5 tapping years followed the order:juvenile seedlings(644.40 kg/hm2)>mature seedlings(554.41 kg/hm2)>self-rooted seedlings(481.10 kg/hm2),and the yield of juvenile seedlings was significantly higher than that of self-rooted seedlings(P<0.05);(2)There were no significant differences in initial latex flow rate and plugging index among different materials,indi-cating that latex flow characteristics within the same cultivar were little affected by the type of planting material;3)The contents of latex inorganic phosphorus and sucrose were the highest in juvenile seedlings,which were significantly higher than those of self-rooted seedlings and mature seedlings(P<0.05).Juvenile budded seedlings presented better substance and energy metabolism levels in terms of thiol and total solid content,and their early rubber yield perform-ance was remarkably superior to self-rooted seedlings.Therefore,juvenile budded seedlings are recommended as the preferred choice for rubber plantation establishment in production.