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一、引言在数千种含有橡胶的植物中,据称只有一千多种可作为橡胶的来源或含有适量的橡胶。巴西橡胶则是目前唯一在商业规模上广泛利用的一个种。无可怀疑,东方商业规模种植的材料,都是来自魏克汉所采集的种子。这些胶树的祖先大半可追溯到1877年魏克汉引到新加坡的22株原始实生苗。虽然后来继续引种,但这些材料只是最近才用于育种研究工作的。
I. INTRODUCTION Of the thousands of rubber-containing plants, only about a thousand are said to be sources of rubber or contain the right amount of rubber. Brazilian rubber is by far the only one widely used in commercial scale. Undoubtedly, the materials planted on the Eastern commercial scale come from the seeds collected by Weikehan. Most of the ancestors of these gum trees date back to 22 original seedlings that Weikehan led to Singapore in 1877. Although later introduced, these materials have only recently been used in breeding research.