热带作物学报2026，Vol.47Issue(9)：2245-2252,8.DOI:10.3969/j.issn.1000-2561.2026.09.010
粒重对橡胶树GT1种子萌发和幼苗生长的影响
Effects of Seed Weight on Germination and Seedling Growth in Rub-ber Tree(Hevea brasiliensis)Clone GT1
摘要
Abstract
To clarify the effects of seed weight of rubber tree clone GT1 on seedling quality and to reveal its roles in seed morphology,water physiology,root development and seedling establishment,GT1 seeds were divided into two groups:above-average weight(T1)and below-average weight(T2)based on the average seed weight.The morphological traits,water uptake and water loss dynamics,post-germination root traits,seedling growth traits,rootstock morphology before budding,and new shoot growth after budding between the two groups were compared with statistical analyses using t-tests and Spearman correlation analyses.The width and height were significantly greater in T1 than in T2(P<0.01),and the proportion of T1 seeds(54.61%)was significantly higher than that of T2(45.39%).During the first 1-3 days before germination,the water absorption rate of T2 seeds was significantly higher than those of T1 by 58.37%,52.48%and 47.35%respectively,and T2 seeds also exhibited faster water loss rates.Compared with T1,T2 seeds showed a 37.56%reduction in the number of secondary lateral roots and a 35.75%shorter primary lateral root length after ger-mination.At the stable stages of the first and second whorl leaves,seedling height,stem diameter,leaf length,leaf width and SPAD values were mostly significantly lower in T2.Before budding,rootstock stem diameter and leaf width in T2 were significantly reduced by 7.67%and 12.55%,respectively.After budding,new shoot height,stem diameter,leaf length and leaf width in T2 decreased by 7.08%,4.66%,10.25%and 5.46%,respectively,while seed weight had no sig-nificant effect on budding survival rate or leaf SPAD value.At sowing,seed weight showed significant weak and mod-erate positive correlations(r=0.1447～0.3459)with most growth indicators(stem diameter,plant height,leaf length,etc.)at the stable stage of two whorl leaves.In conclusion,seeds with above-average weight in GT1 had obvious advantages in morphology,water regulation,root development and full?cycle seedling growth.It is recommended to preferentially select seeds above the average weight,and seed grading can be employed to improve rootstock quality and subsequent seedling uniformity,thereby providing theoretical and technical support for standardized and intelligent nursery produc-tion of rubber trees.关键词
橡胶树/种子/粒重/萌发/幼苗生长Key words
Hevea brasiliensis/seed/seed weight/germination/seedling growth分类
农业科技引用本文复制引用
陈先红,王军,白先权..粒重对橡胶树GT1种子萌发和幼苗生长的影响[J].热带作物学报,2026,47(9):2245-2252,8.基金项目
海南省自然科学基金项目(No.326MS0289) （No.326MS0289）
现代农业产业技术体系建设专项(No.CARS-34-YZ4). （No.CARS-34-YZ4）
