亚种间杂交稻产量源库特征

 对大量典型的籼粳亚种间杂交种组合的产量源库特征进行了研究，获得了如下如果：亚杂组合的物质生产的优势主要表现在出穗后经济产量形成期，这与籼型三系杂交稻物质生产的优势主要表现在出穗前迥然不同；亚杂组合的库容优势也十分明显，就其总体而言全生育期物质生产量与库容的比例高于汕优63；大多数亚杂组合的光合产物向穗的运转不良，这是部分亚杂组合籽粒充实不良的成因，也是限制亚种间杂种优势充分利用的带普遍性的问题。对这一问题的研究展望及提高亚种间杂交稻籽粒充实度的栽培途径进行了讨论。

Source sink Characteristics Related to the Yield in Intersubspecific Hybrid Rice

The source sink characteristics related to the yield of intersubspecific hybrid rice (IHR) were studied with 36 combinations crossed from 6 typical indica with 6 Japonica lines. The results were as follows: The heterosis in matter production for IHR is mainly in the yield forming period after heading, it is different from that of traditional inter varietal hybrids, which have heterosis in matter production mainly in the period before heading. The heterosis in sink capacity of IHR is also obvious. IHR is similar to Shanyou 63 in mass production in whole growing season, but the former has higher heterosis than Latter after heading. The poor flow of photosynthetic product to the panicle of IHR is the main reason for poor plumpness, this has also limited Its wider use in practice.Breeding for higher grain plumpness in IHR was discussed.