The HPHR has more vascular bundles and a much bigger area of single vascular bundle, total vascular bundle, total phloem and total xylem in the first internode than Shanyou 63.

• 结果表明，重穗型组合的大维管束数目、单个维管束面积及维管束总面积、韧皮部总面积均明显高于汕优63。